[英]SOLVED How to retrieve RichText content From (MySQL) table to a WPF RichTextBox
谢谢你们，我可以使用 user9938 和 Bradley Grainger 给出的答案，它不仅有效，而且我也理解为什么它现在有效。 我得到了最好的帮助。
现在，我将处理关于在我的数据库表中的字段命名和在代码中参数化 SQL 数据的并行给定建议。
我有一个应用程序，我必须在其中将供应商数据存储（和检索）到我的 WPF 页面中，其中一个字段是 RichTextBox
在我的 Xaml 页面上，我像这样定义了富文本块
<TabItem Header="Memo">
<Grid Background="#FFE5E5E5">
<TextBlock Text="Comments" HorizontalAlignment="Left" VerticalAlignment="Top"
Margin="10,10" FontWeight="Bold" Foreground="DarkRed"/>
<RichTextBox x:Name="inpSupplierMemo" HorizontalAlignment="Center"
VerticalAlignment="Top" Margin="10,70,10,0" Height="182" Width="Auto">
<FlowDocument>
<Paragraph>
<Run Text=""/>
</Paragraph>
</FlowDocument>
</RichTextBox>
</Grid>
</TabItem>
在我的 MySql 数据库表中，我将该字段定义为 LONGTEXT
我的 C# 代码将富文本数据存储到字段中：
private void ToolbarButtonSave(object sender, RoutedEventArgs e)
{
string ContentSupplierMemo;
if (inpSupplierCode.Text != "")
{
TextRange tr = new(inpSupplierMemo.Document.ContentStart,
inpSupplierMemo.Document.ContentEnd);
using (MemoryStream ms = new())
{
tr.Save(ms, DataFormats.Rtf);
ContentSupplierMemo = Encoding.ASCII.GetString(ms.ToArray());
}
}
else { ContentSupplierMemo = ""; }
Database dbConnection = new Database
{
TableName = DatabaseTable
};
dbConnection.Connect();
dbConnection.SqlCommand = "UPDATE ";
dbConnection.SqlCommandString = " SET " +
"supplier_Code = '" + inpSupplierCode.Text + "', " +
"supplier_Name = '" + inpSupplierName.Text + "', " +
"supplier_Address1 = '" + inpSupplierAddress1.Text + "', " +
"supplier_Address2 = '" + inpSupplierAddress2.Text + "', " +
"supplier_Zip = '" + inpSupplierZip.Text + "', " +
"supplier_City = '" + inpSupplierCity.Text + "', " +
"supplier_Url = '" + inpSupplierUrl.Text + "', " +
"supplier_Memo = '" + ContentSupplierMemo + "', " +
"supplier_Id = " + valueSupplierId.Text + ";";
dbConnection.TableName = DatabaseTable;
_ = dbConnection.UpdateMySqlDataRecord();
DataTable dtSupplierCodes = dbConnection.LoadMySqlData();
// Load the data from the database into the datagrid
SupplierCode_DataGrid.DataContext = dtSupplierCodes;
// Make sure the eddited row in the datagrid is selected
SupplierCode_DataGrid.SelectedIndex = int.Parse(valueSupplierId.Text) - 1;
SupplierCode_DataGrid.Focus();
}
到目前为止显示 RichTextBox 并保存数据。 如果我运行该应用程序，我可以输入文本并保存它（屏幕截图中未显示“保存”按钮）
富文本框的内容存储在数据库中
和详细的内容
到目前为止一切顺利但是当我从数据库中检索内容时，我无法再显示原始内容。
我用于数据检索的 C# 代码：
private void SupplierCode_DataGrid_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
DataGrid dataGrid = (DataGrid)sender;
if (dataGrid.SelectedItem is not DataRowView Row_Selected)
{
return;
}
valueSupplierId.Text = Row_Selected["supplier_Id"].ToString();
inpSupplierCode.Text = Row_Selected["supplier_Code"].ToString();
inpSupplierName.Text = Row_Selected["supplier_Name"].ToString();
inpSupplierAddress1.Text = Row_Selected["supplier_Address1"].ToString();
inpSupplierAddress2.Text = Row_Selected["supplier_Address2"].ToString();
inpSupplierZip.Text = Row_Selected["supplier_Zip"].ToString();
inpSupplierCity.Text = Row_Selected["supplier_City"].ToString();
inpSupplierUrl.Text = Row_Selected["supplier_Url"].ToString();
inpSupplierMemo.Document.Blocks.Clear();
// Read formatted ritch text from table and store in field
string ContentSupplierMemo = Row_Selected["supplier_Memo"].ToString();
if (ContentSupplierMemo != "")
{
byte[] byteArray = Encoding.ASCII.GetBytes(ContentSupplierMemo);
using (MemoryStream ms = new(byteArray))
{
TextRange tr = new(inpSupplierMemo.Document.ContentStart, inpSupplierMemo.Document.ContentEnd);
tr.Load(ms, DataFormats.Rtf);
}
}
}
这段代码的结果是：
但我预料到
我哪里出错了，有人可以帮我解决这个问题。
我现在用谷歌搜索了三天，只看到或多或少相同的解决方案，尝试了不同的解决方案，但有了这个解决方案，我最接近我的目标，但还没有。
问候， 赫伯特
下面是一个演示项目，展示了如何将来自 TextBlock 的数据存储在数据库中。 它还展示了如何从数据库中检索数据并将其显示在 TextBlock 中。
以下代码已经过测试。 longtext用于supplier_Memo 。 或者，可以使用longblob （或mediumblob ，如果它满足您的需要）。 由于longblob是二进制数据，因此需要修改下面的代码以将数据作为byte[]而不是string传递。
使用参数来避免 SQL 注入也很重要。
创建一个新的WPF App (.NET Framework)项目（名称：DatabaseMySqlHN）
VS 2019 ：
主窗口.xaml
<Window x:Class="DatabaseMySqlHN.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:DatabaseMySqlHN"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="40" />
<RowDefinition Height="25" />
<RowDefinition Height="150" />
<RowDefinition Height="25" />
<RowDefinition Height="*" />
<RowDefinition Height="20" />
</Grid.RowDefinitions>
<Grid Grid.Row="0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100" />
<ColumnDefinition Width="10" />
<ColumnDefinition Width="100" />
<ColumnDefinition Width="10" />
<ColumnDefinition Width="100" />
<ColumnDefinition Width="10" />
<ColumnDefinition Width="100" />
<ColumnDefinition Width="10" />
</Grid.ColumnDefinitions>
<Button Grid.Column="0" x:Name="btnCreateTbl" Click="btnCreateTbl_Click">Create Table</Button>
<Button Grid.Column="2" x:Name="btnInsertTestData" Click="btnInsertTestData_Click">Insert Test Data</Button>
<Button Grid.Column="4" x:Name="btnGetData" Click="btnGetData_Click">Get Data</Button>
<Button Grid.Column="6" x:Name="btnSaveUpdate" Click="btnSaveUpdate_Click">Save/Update</Button>
</Grid>
<DataGrid Grid.Row="2" x:Name="SupplierCode_DataGrid" ItemsSource="{Binding}" SelectionChanged="SupplierCode_DataGrid_SelectionChanged"></DataGrid>
<TabControl Grid.Row="4" x:Name="tabControl1">
<TabItem Header="Memo">
<Grid Background="#FFE5E5E5">
<TextBlock Text="Comments" HorizontalAlignment="Left" VerticalAlignment="Top"
Margin="10,10" FontWeight="Bold" Foreground="DarkRed"/>
<RichTextBox x:Name="inpSupplierMemo" HorizontalAlignment="Center"
VerticalAlignment="Top" Margin="10,70,10,0" Height="182" Width="Auto">
<FlowDocument Name="inpSupplierMemoFD">
<Paragraph>
<Run Text=""/>
</Paragraph>
</FlowDocument>
</RichTextBox>
</Grid>
</TabItem>
</TabControl>
<TextBox Grid.Row="5" Name="textBoxStatus" IsReadOnly="True" Text="" Background="LightGray"></TextBox>
</Grid>
</Window>
数据库表：供应商
注意：在下面的代码中，我尝试维护 OP 中提供的数据库列名称。 但是，表名真的不应该是列名的一部分。
而不是命名列supplier_Code ，命名列Code 。
可能需要根据您的要求添加/修改列。
CREATE TABLE Supplier (supplier_Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
supplier_Code varchar(4),
supplier_Name varchar(80),
supplier_Address1 varchar(80),
supplier_Address2 varchar(80),
supplier_Zip varchar(80),
supplier_City varchar(80),
supplier_Url varchar(80),
supplier_MailSales varchar(80),
supplier_MailSupport varchar(80),
supplier_Memo longtext,
currency_Id int,
currency_Code varchar(4));
创建一个类（名称：HelperMySql.cs）
HelperMySql.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MySql.Data;
using MySql.Data.MySqlClient;
using System.Data;
using System.Diagnostics;
namespace DatabaseMySqlHN
{
public class HelperMySQL
{
public string ConnectionStr { get; set; } = string.Empty;
public HelperMySQL(string serverName, string databaseName, string username, string userPwd)
{
ConnectionStr = String.Format("Server={0};Database={1};Uid={2};Pwd={3};", serverName, databaseName, username, userPwd);
}
public HelperMySQL(string serverName, int portNumber, string databaseName, string username, string userPwd)
{
ConnectionStr = String.Format("Server={0};Port={1};Database={2};Uid={3};Pwd={4};", serverName, portNumber, databaseName, username, userPwd);
}
public string CreateTableSupplier()
{
string msg = string.Empty;
try
{
//for mySQL, use backticks if tablename has space in it
//total max size for all columns is 65535 - excluding TEXT and BLOB
string sqlText = @"CREATE TABLE Supplier (supplier_Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
supplier_Code varchar(4),
supplier_Name varchar(80),
supplier_Address1 varchar(80),
supplier_Address2 varchar(80),
supplier_Zip varchar(80),
supplier_City varchar(80),
supplier_Url varchar(80),
supplier_MailSales varchar(80),
supplier_MailSupport varchar(80),
supplier_Memo longtext,
currency_Id int,
currency_Code varchar(4));";
ExecuteNonQuery(sqlText);
Debug.WriteLine("Info: Table created (Supplier)");
msg = "Status: Table created (Supplier).";
}
catch (MySqlException ex)
{
msg = "Error: (CreateTableSupplier - MySqlException) - " + ex.Message;
Debug.WriteLine(msg);
//throw ex;
}
catch (Exception ex)
{
msg = "Error: (CreateTableSupplier) - " + ex.Message;
Debug.WriteLine(msg);
//throw ex;
}
return msg;
}
public void ExecuteNonQuery(string sqlText)
{
using (MySqlConnection con = new MySqlConnection(ConnectionStr))
{
//open
con.Open();
using (MySqlCommand cmd = new MySqlCommand(sqlText, con))
{
//execute
cmd.ExecuteNonQuery();
}
}
}
public int ExecuteNonQueryTblSupplier(string sqlText, string supplierCode, string supplierName, string supplierAddress1, string supplierAddress2, string supplierZip, string supplierCity, string supplierUrl, string supplierMemo, int supplierId = 0)
{
int rowsAffected = 0;
using (MySqlConnection con = new MySqlConnection(ConnectionStr))
{
//open
con.Open();
using (MySqlCommand cmd = new MySqlCommand(sqlText, con))
{
//set values - if they exist
//if a value is null, one must use DBNull.Value
//if the value is DBNull.Value, and the table column doesn't allow nulls, this will cause an error
//add parameters setting string values to DBNull.Value
cmd.Parameters.Add("@supplierId", MySqlDbType.Int32).Value = supplierId;
cmd.Parameters.Add("@supplierCode", MySqlDbType.VarChar).Value = DBNull.Value;
cmd.Parameters.Add("@supplierName", MySqlDbType.VarChar).Value = DBNull.Value;
cmd.Parameters.Add("@supplierAddress1", MySqlDbType.VarChar).Value = DBNull.Value;
cmd.Parameters.Add("@supplierAddress2", MySqlDbType.VarChar).Value = DBNull.Value;
cmd.Parameters.Add("@supplierZip", MySqlDbType.VarChar).Value = DBNull.Value;
cmd.Parameters.Add("@supplierCity", MySqlDbType.VarChar).Value = DBNull.Value;
cmd.Parameters.Add("@supplierUrl", MySqlDbType.VarChar).Value = DBNull.Value;
cmd.Parameters.Add("@supplierMemo", MySqlDbType.LongText).Value = DBNull.Value;
//set values
if (!String.IsNullOrEmpty(supplierCode))
cmd.Parameters["@supplierCode"].Value = supplierCode;
if (!String.IsNullOrEmpty(supplierName))
cmd.Parameters["@supplierName"].Value = supplierName;
if (!String.IsNullOrEmpty(supplierAddress1))
cmd.Parameters["@supplierAddress1"].Value = supplierAddress1;
if (!String.IsNullOrEmpty(supplierAddress2))
cmd.Parameters["@supplierAddress2"].Value = supplierAddress2;
if (!String.IsNullOrEmpty(supplierZip))
cmd.Parameters["@supplierZip"].Value = supplierZip;
if (!String.IsNullOrEmpty(supplierCity))
cmd.Parameters["@supplierCity"].Value = supplierCity;
if (!String.IsNullOrEmpty(supplierUrl))
cmd.Parameters["@supplierUrl"].Value = supplierUrl;
if (supplierMemo != null && supplierMemo.Length > 0)
cmd.Parameters["@supplierMemo"].Value = supplierMemo;
//execute; returns the number of rows affected
rowsAffected = cmd.ExecuteNonQuery();
}
}
return rowsAffected;
}
public DataTable GetDataTblSupplier(int supplierId = 0)
{
DataTable dt = new DataTable();
string sqlText = string.Empty;
if (supplierId > 0)
{
sqlText = "SELECT * from Supplier where supplier_Id = @supplierId";
}
else
{
sqlText = "SELECT * from Supplier";
}
using (MySqlConnection con = new MySqlConnection(ConnectionStr))
{
//open
con.Open();
using (MySqlCommand cmd = new MySqlCommand(sqlText, con))
{
//add parameter
cmd.Parameters.Add("@supplierId", MySqlDbType.Int32).Value = supplierId;
using (MySqlDataAdapter da = new MySqlDataAdapter(cmd))
{
//use DataAdapter to fill DataTable
da.Fill(dt);
}
}
}
return dt;
}
public string InsertTblSupplier(string supplierCode, string supplierName, string supplierAddress1, string supplierAddress2, string supplierZip, string supplierCity, string supplierUrl, string supplierMemo)
{
string result = string.Empty;
string sqlText = "INSERT INTO Supplier (supplier_Code, supplier_Name, supplier_Address1, supplier_Address2, supplier_Zip, supplier_City, supplier_Url, supplier_Memo) VALUES (@supplierCode, @supplierName, @supplierAddress1, @supplierAddress2, @supplierZip, @supplierCity, @supplierUrl, @supplierMemo);";
try
{
int rowsAffected = ExecuteNonQueryTblSupplier(sqlText, supplierCode, supplierName, supplierAddress1, supplierAddress2, supplierZip, supplierCity, supplierUrl, supplierMemo);
if (rowsAffected > 0)
{
result = String.Format("Row added.");
}
else
{
result = "Row not added.";
}
}
catch (MySqlException ex)
{
Debug.WriteLine("Error (UpdateTblSupplier - MySqlException): " + ex.Message);
throw ex;
}
catch (Exception ex)
{
Debug.WriteLine("Error (UpdateTblSupplier): " + ex.Message);
throw ex;
}
return result;
}
public string UpdateTblSupplier(int supplierId, string supplierCode, string supplierName, string supplierAddress1, string supplierAddress2, string supplierZip, string supplierCity, string supplierUrl, string supplierMemo)
{
string result = string.Empty;
string sqlText = "UPDATE Supplier SET supplier_Code = @supplierCode, supplier_name = @supplierName, supplier_Address1 = @supplierAddress1, supplier_Address2 = @supplierAddress2, supplier_Zip = @supplierZip, supplier_City = @supplierCity, supplier_Url = @supplierUrl, supplier_Memo = @supplierMemo WHERE supplier_Id = @supplierId;";
try
{
int rowsAffected = ExecuteNonQueryTblSupplier(sqlText, supplierCode, supplierName, supplierAddress1, supplierAddress2, supplierZip, supplierCity, supplierUrl, supplierMemo, supplierId);
if (rowsAffected > 0)
{
result = "Updated successfully";
}
else
{
result = "No rows were updated.";
}
}
catch (MySqlException ex)
{
Debug.WriteLine("Error (UpdateTblSupplier - MySqlException): " + ex.Message);
throw ex;
}
catch (Exception ex)
{
Debug.WriteLine("Error (UpdateTblSupplier): " + ex.Message);
throw ex;
}
return result;
}
}
}
主窗口.xaml.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Diagnostics;
using System.Data;
using System.IO;
namespace DatabaseMySqlHN
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
private HelperMySQL _helper = null;
private System.Data.DataTable _dt = null;
private int _currentDataGridIndex = 0;
private int _dbRowCount = 0;
public MainWindow()
{
InitializeComponent();
}
private void GetData()
{
InitializeHelper();
//get data from database
_dt = _helper.GetDataTblSupplier();
//populate data in DataGrid from DataTable
SupplierCode_DataGrid.DataContext = _dt;
//set value
_dbRowCount = _dt.Rows.Count;
//clear existing data
inpSupplierMemo.Document.Blocks.Clear();
}
private void GetMemo(int index)
{
string ContentSupplierMemo = string.Empty;
if (_dt != null && index >= 0 && index < _dt.Rows.Count)
{
//set value
DataRow row = _dt.Rows[index];
if (row["supplier_Memo"] != null && row["supplier_Memo"] != DBNull.Value)
{
//get value from DataTable
ContentSupplierMemo = row["supplier_Memo"].ToString();
}
if (!String.IsNullOrEmpty(ContentSupplierMemo))
{
//Debug.WriteLine("Length: " + ContentSupplierMemo.Length);
//clear existing data
inpSupplierMemo.Document.Blocks.Clear();
//convert to byte[]
byte[] dataArr = System.Text.Encoding.UTF8.GetBytes(ContentSupplierMemo);
using (MemoryStream ms = new MemoryStream(dataArr))
{
//inpSupplierMemo.Document = new FlowDocument();
//load data
TextRange flowDocRange = new TextRange(inpSupplierMemo.Document.ContentStart, inpSupplierMemo.Document.ContentEnd);
flowDocRange.Load(ms, DataFormats.Rtf);
}
}
}
}
private string GetRichTextFromFlowDocument(FlowDocument fDoc)
{
string result = string.Empty;
//convert to string
if (fDoc != null)
{
TextRange tr = new TextRange(fDoc.ContentStart, fDoc.ContentEnd);
using (MemoryStream ms = new MemoryStream())
{
tr.Save(ms, DataFormats.Rtf);
result = System.Text.Encoding.UTF8.GetString(ms.ToArray());
}
}
return result;
}
private void InitializeHelper()
{
if (_helper == null)
{
//servername, databaseName, userName, userPassword
_helper = new HelperMySQL("localhost", "HN", "testUser", "removed");
}
}
private void InsertRow(int dgIndex)
{
//since the DataGrid DataContext is set to the DataTable,
//the DataTable is updated when data is modified in the DataGrid
//get last row
DataRow row = _dt.Rows[_dt.Rows.Count - 1];
//get data from DataTable
string supplierCode = row["supplier_Code"].ToString();
string supplierName = row["supplier_Name"].ToString();
string supplierAddress1 = row["supplier_Address1"].ToString();
string supplierAddress2 = row["supplier_Address2"].ToString();
string supplier_Zip = row["supplier_Zip"].ToString();
string supplier_City = row["supplier_City"].ToString();
string supplier_Url = row["supplier_Url"].ToString();
//convert RTF to string
string memo = GetRichTextFromFlowDocument(inpSupplierMemo.Document);
InitializeHelper();
string result = string.Empty;
result = _helper.InsertTblSupplier(supplierCode, supplierName, supplierAddress1, supplierAddress2, supplier_Zip, supplier_City, supplier_Url, memo);
UpdateStatus(result);
}
private void UpdateRow(int dgIndex)
{
//when DataGrid SelectionChanged occurs, the value of '_currentDataGridIndex' is set
//to DataGrid SelectedIndex
//get data from DataTable
DataRow row = _dt.Rows[_currentDataGridIndex];
int supplierId = (int)row["supplier_Id"];
string supplierCode = row["supplier_Code"].ToString();
string supplierName = row["supplier_Name"].ToString();
string supplierAddress1 = row["supplier_Address1"].ToString();
string supplierAddress2 = row["supplier_Address2"].ToString();
string supplier_Zip = row["supplier_Zip"].ToString();
string supplier_City = row["supplier_City"].ToString();
string supplier_Url = row["supplier_Url"].ToString();
//convert RTF to string
string memo = GetRichTextFromFlowDocument(inpSupplierMemo.Document);
InitializeHelper();
string result = string.Empty;
result = _helper.UpdateTblSupplier(supplierId, supplierCode, supplierName, supplierAddress1, supplierAddress2, supplier_Zip, supplier_City, supplier_Url, memo);
UpdateStatus(result);
}
private void UpdateStatus(string msg)
{
if (!String.IsNullOrEmpty(msg))
{
if (!msg.StartsWith("Error") && !msg.StartsWith("Status"))
{
textBoxStatus.Text = String.Format("Status: {0} ({1})", msg, DateTime.Now.ToString("HH:mm:ss"));
Debug.WriteLine(String.Format("{0} - Status: {1}", DateTime.Now.ToString("HH:mm:ss"), msg));
}
else
{
textBoxStatus.Text = String.Format("{0} ({1})", msg, DateTime.Now.ToString("HH:mm:ss"));
Debug.WriteLine(String.Format("{0} - {1}", DateTime.Now.ToString("HH:mm:ss"), msg));
}
}
}
private void btnCreateTbl_Click(object sender, RoutedEventArgs e)
{
InitializeHelper();
//create table
string result = _helper.CreateTableSupplier();
UpdateStatus(result);
}
private void btnGetData_Click(object sender, RoutedEventArgs e)
{
GetData();
//update status
string msg = "Status: '" + _dt.Rows.Count + "' rows retrieved.";
UpdateStatus(msg);
}
private void SupplierCode_DataGrid_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
DataGrid dg = (DataGrid)sender;
//set value
_currentDataGridIndex = dg.SelectedIndex;
GetMemo(dg.SelectedIndex);
}
private void btnSaveUpdate_Click(object sender, RoutedEventArgs e)
{
int rowIndex = _currentDataGridIndex;
if (_dt.Rows.Count > _dbRowCount)
{
InsertRow(SupplierCode_DataGrid.SelectedIndex);
}
else
{
UpdateRow(SupplierCode_DataGrid.SelectedIndex);
}
GetData();
// Make sure the eddited row in the datagrid is selected
SupplierCode_DataGrid.SelectedIndex = rowIndex;
SupplierCode_DataGrid.Focus();
}
private void btnInsertTestData_Click(object sender, RoutedEventArgs e)
{
string result = string.Empty;
GetData();
//only insert test data if no rows exist
if (_dt.Rows.Count == 0)
{
string memo1 = @"{\rtf1\ansi\ansicpg1252\deff0\nouicompat\deflang1033{\fonttbl{\f0\fnil\fcharset0 Calibri;}}
{\*\generator Riched20 10.0.19041}\viewkind4\uc1
\pard\sa200\sl276\slmult1\f0\fs22\lang9 Test Comments 1\par
}";
string memo2 = @"{\rtf1\ansi\ansicpg1252\deff0\nouicompat\deflang1033{\fonttbl{\f0\fnil\fcharset0 Calibri;}}
{\*\generator Riched20 10.0.19041}\viewkind4\uc1
\pard\sa200\sl276\slmult1\f0\fs22\lang9 Test Comments 2\par
}";
InitializeHelper();
result = _helper.InsertTblSupplier("1", "Acme 123", "51 my street", null, "12345", "Some City", "https://www.myUrl1.com", memo1);
UpdateStatus(result);
result = _helper.InsertTblSupplier("2", "Acme 456", "52 my street", null, "12345", "Some City", "https://www.myUrl2.com", memo2);
UpdateStatus(result);
GetData();
}
else
{
UpdateStatus("Status: Data exists in table-test data not added.");
}
}
}
}
资源：
您的错误是由这一行引起的：
"supplier_Memo = '" + ContentSupplierMemo + "', " +
ContentSupplierMemo包含看起来像{\\rtf1\\ansi\\ansicpg1252... RTF。 当您将其连接到您的 SQL 语句时，反斜杠将直接发送到 MySQL，它会将它们解释为转义字符并破坏您的数据。
解决方案是使用参数化 SQL。 我不熟悉您的特定数据库包装器（ dbConnection.UpdateMySqlDataRecord(); ），但大多数库都提供了一种向命令添加参数的方法。 在 ADO.NET 中，它将是：
using var command = new MySqlCommand();
command.CommandText = @"UPDATE Supplier SET
supplier_Code = @supplierCode,
...
supplier_Memo = @supplierMemo
WHERE supplier_Id = @supplierId;";
command.Connection = connection;
command.Parameters.AddWithValue("@supplierCode", inpSupplierCode.Text);
...
command.Parameters.AddWithValue("@supplierMemo", ContentSupplierMemo);
command.Parameters.AddWithValue("@supplierId", valueSupplierId.Text);
command.ExecuteNonQuery();
最后，您使用Encoding.ASCII.GetString(ms.ToArray()); 很可能会损坏数据。 您应该避免这种情况，只需将ms.ToArray()保存在LONGBLOB列中。
下面是一个演示项目，展示了如何将来自 TextBlock 的数据存储在数据库中。 它还展示了如何从数据库中检索数据并将其显示在 TextBlock 中。
以下代码已经过测试。 longblob用于supplier_Memo 。 或者，如果满足您的需要，可以使用mediumblob 。
使用参数来避免 SQL 注入也很重要。
创建一个新的WPF App (.NET Framework)项目（名称：DatabaseMySqlHN）
VS 2019 ：
主窗口.xaml
<Window x:Class="DatabaseMySqlHN.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:DatabaseMySqlHN"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="40" />
<RowDefinition Height="25" />
<RowDefinition Height="150" />
<RowDefinition Height="25" />
<RowDefinition Height="*" />
<RowDefinition Height="20" />
</Grid.RowDefinitions>
<Grid Grid.Row="0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100" />
<ColumnDefinition Width="10" />
<ColumnDefinition Width="100" />
<ColumnDefinition Width="10" />
<ColumnDefinition Width="100" />
<ColumnDefinition Width="10" />
<ColumnDefinition Width="100" />
<ColumnDefinition Width="10" />
</Grid.ColumnDefinitions>
<Button Grid.Column="0" x:Name="btnCreateTbl" Click="btnCreateTbl_Click">Create Table</Button>
<Button Grid.Column="2" x:Name="btnInsertTestData" Click="btnInsertTestData_Click">Insert Test Data</Button>
<Button Grid.Column="4" x:Name="btnGetData" Click="btnGetData_Click">Get Data</Button>
<Button Grid.Column="6" x:Name="btnSaveUpdate" Click="btnSaveUpdate_Click">Save/Update</Button>
</Grid>
<DataGrid Grid.Row="2" x:Name="SupplierCode_DataGrid" ItemsSource="{Binding}" SelectionChanged="SupplierCode_DataGrid_SelectionChanged"></DataGrid>
<TabControl Grid.Row="4" x:Name="tabControl1">
<TabItem Header="Memo">
<Grid Background="#FFE5E5E5">
<TextBlock Text="Comments" HorizontalAlignment="Left" VerticalAlignment="Top"
Margin="10,10" FontWeight="Bold" Foreground="DarkRed"/>
<RichTextBox x:Name="inpSupplierMemo" HorizontalAlignment="Center"
VerticalAlignment="Top" Margin="10,70,10,0" Height="182" Width="Auto">
<FlowDocument Name="inpSupplierMemoFD">
<Paragraph>
<Run Text=""/>
</Paragraph>
</FlowDocument>
</RichTextBox>
</Grid>
</TabItem>
</TabControl>
<TextBox Grid.Row="5" Name="textBoxStatus" IsReadOnly="True" Text="" Background="LightGray"></TextBox>
</Grid>
</Window>
数据库表：供应商
注意：在下面的代码中，我尝试维护 OP 中提供的数据库列名称。 但是，表名真的不应该是列名的一部分。
而不是命名列supplier_Code ，命名列Code 。
可能需要根据您的要求添加/修改列。
CREATE TABLE Supplier (supplier_Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
supplier_Code varchar(4),
supplier_Name varchar(80),
supplier_Address1 varchar(80),
supplier_Address2 varchar(80),
supplier_Zip varchar(80),
supplier_City varchar(80),
supplier_Url varchar(80),
supplier_MailSales varchar(80),
supplier_MailSupport varchar(80),
supplier_Memo longblob,
currency_Id int,
currency_Code varchar(4));
创建一个类（名称：HelperMySql.cs）
HelperMySql.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MySql.Data;
using MySql.Data.MySqlClient;
using System.Data;
using System.Diagnostics;
namespace DatabaseMySqlHN
{
public class HelperMySQL
{
public string ConnectionStr { get; set; } = string.Empty;
public HelperMySQL(string serverName, string databaseName, string username, string userPwd)
{
ConnectionStr = String.Format("Server={0};Database={1};Uid={2};Pwd={3};", serverName, databaseName, username, userPwd);
}
public HelperMySQL(string serverName, int portNumber, string databaseName, string username, string userPwd)
{
ConnectionStr = String.Format("Server={0};Port={1};Database={2};Uid={3};Pwd={4};", serverName, portNumber, databaseName, username, userPwd);
}
public string CreateTableSupplier()
{
string msg = string.Empty;
try
{
//for mySQL, use backticks if tablename has space in it
//total max size for all columns is 65535 - excluding TEXT and BLOB
string sqlText = @"CREATE TABLE Supplier (supplier_Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
supplier_Code varchar(4),
supplier_Name varchar(80),
supplier_Address1 varchar(80),
supplier_Address2 varchar(80),
supplier_Zip varchar(80),
supplier_City varchar(80),
supplier_Url varchar(80),
supplier_MailSales varchar(80),
supplier_MailSupport varchar(80),
supplier_Memo longblob,
currency_Id int,
currency_Code varchar(4));";
ExecuteNonQuery(sqlText);
Debug.WriteLine("Info: Table created (Supplier)");
msg = "Status: Table created (Supplier).";
}
catch (MySqlException ex)
{
msg = "Error: (CreateTableSupplier - MySqlException) - " + ex.Message;
Debug.WriteLine(msg);
//throw ex;
}
catch (Exception ex)
{
msg = "Error: (CreateTableSupplier) - " + ex.Message;
Debug.WriteLine(msg);
//throw ex;
}
return msg;
}
public void ExecuteNonQuery(string sqlText)
{
using (MySqlConnection con = new MySqlConnection(ConnectionStr))
{
//open
con.Open();
using (MySqlCommand cmd = new MySqlCommand(sqlText, con))
{
//execute
cmd.ExecuteNonQuery();
}
}
}
public int ExecuteNonQueryTblSupplier(string sqlText, string supplierCode, string supplierName, string supplierAddress1, string supplierAddress2, string supplierZip, string supplierCity, string supplierUrl, byte[] supplierMemo, int supplierId = 0)
{
int rowsAffected = 0;
using (MySqlConnection con = new MySqlConnection(ConnectionStr))
{
//open
con.Open();
using (MySqlCommand cmd = new MySqlCommand(sqlText, con))
{
//set values - if they exist
//if a value is null, one must use DBNull.Value
//if the value is DBNull.Value, and the table column doesn't allow nulls, this will cause an error
//add parameters setting string values to DBNull.Value
cmd.Parameters.Add("@supplierId", MySqlDbType.Int32).Value = supplierId;
cmd.Parameters.Add("@supplierCode", MySqlDbType.VarChar).Value = DBNull.Value;
cmd.Parameters.Add("@supplierName", MySqlDbType.VarChar).Value = DBNull.Value;
cmd.Parameters.Add("@supplierAddress1", MySqlDbType.VarChar).Value = DBNull.Value;
cmd.Parameters.Add("@supplierAddress2", MySqlDbType.VarChar).Value = DBNull.Value;
cmd.Parameters.Add("@supplierZip", MySqlDbType.VarChar).Value = DBNull.Value;
cmd.Parameters.Add("@supplierCity", MySqlDbType.VarChar).Value = DBNull.Value;
cmd.Parameters.Add("@supplierUrl", MySqlDbType.VarChar).Value = DBNull.Value;
cmd.Parameters.Add("@supplierMemo", MySqlDbType.LongBlob).Value = DBNull.Value;
//set values
if (!String.IsNullOrEmpty(supplierCode))
cmd.Parameters["@supplierCode"].Value = supplierCode;
if (!String.IsNullOrEmpty(supplierName))
cmd.Parameters["@supplierName"].Value = supplierName;
if (!String.IsNullOrEmpty(supplierAddress1))
cmd.Parameters["@supplierAddress1"].Value = supplierAddress1;
if (!String.IsNullOrEmpty(supplierAddress2))
cmd.Parameters["@supplierAddress2"].Value = supplierAddress2;
if (!String.IsNullOrEmpty(supplierZip))
cmd.Parameters["@supplierZip"].Value = supplierZip;
if (!String.IsNullOrEmpty(supplierCity))
cmd.Parameters["@supplierCity"].Value = supplierCity;
if (!String.IsNullOrEmpty(supplierUrl))
cmd.Parameters["@supplierUrl"].Value = supplierUrl;
if (supplierMemo != null && supplierMemo.Length > 0)
cmd.Parameters["@supplierMemo"].Value = supplierMemo;
//execute; returns the number of rows affected
rowsAffected = cmd.ExecuteNonQuery();
}
}
return rowsAffected;
}
public DataTable GetDataTblSupplier(int supplierId = 0)
{
DataTable dt = new DataTable();
string sqlText = string.Empty;
if (supplierId > 0)
{
sqlText = "SELECT * from Supplier where supplier_Id = @supplierId";
}
else
{
sqlText = "SELECT * from Supplier";
}
using (MySqlConnection con = new MySqlConnection(ConnectionStr))
{
//open
con.Open();
using (MySqlCommand cmd = new MySqlCommand(sqlText, con))
{
//add parameter
cmd.Parameters.Add("@supplierId", MySqlDbType.Int32).Value = supplierId;
using (MySqlDataAdapter da = new MySqlDataAdapter(cmd))
{
//use DataAdapter to fill DataTable
da.Fill(dt);
}
}
}
return dt;
}
public string InsertTblSupplier(string supplierCode, string supplierName, string supplierAddress1, string supplierAddress2, string supplierZip, string supplierCity, string supplierUrl, byte[] supplierMemo)
{
string result = string.Empty;
string sqlText = "INSERT INTO Supplier (supplier_Code, supplier_Name, supplier_Address1, supplier_Address2, supplier_Zip, supplier_City, supplier_Url, supplier_Memo) VALUES (@supplierCode, @supplierName, @supplierAddress1, @supplierAddress2, @supplierZip, @supplierCity, @supplierUrl, @supplierMemo);";
try
{
int rowsAffected = ExecuteNonQueryTblSupplier(sqlText, supplierCode, supplierName, supplierAddress1, supplierAddress2, supplierZip, supplierCity, supplierUrl, supplierMemo);
if (rowsAffected > 0)
{
result = String.Format("Row added.");
}
else
{
result = "Row not added.";
}
}
catch (MySqlException ex)
{
Debug.WriteLine("Error (UpdateTblSupplier - MySqlException): " + ex.Message);
throw ex;
}
catch (Exception ex)
{
Debug.WriteLine("Error (UpdateTblSupplier): " + ex.Message);
throw ex;
}
return result;
}
public string UpdateTblSupplier(int supplierId, string supplierCode, string supplierName, string supplierAddress1, string supplierAddress2, string supplierZip, string supplierCity, string supplierUrl, byte[] supplierMemo)
{
string result = string.Empty;
string sqlText = "UPDATE Supplier SET supplier_Code = @supplierCode, supplier_name = @supplierName, supplier_Address1 = @supplierAddress1, supplier_Address2 = @supplierAddress2, supplier_Zip = @supplierZip, supplier_City = @supplierCity, supplier_Url = @supplierUrl, supplier_Memo = @supplierMemo WHERE supplier_Id = @supplierId;";
try
{
int rowsAffected = ExecuteNonQueryTblSupplier(sqlText, supplierCode, supplierName, supplierAddress1, supplierAddress2, supplierZip, supplierCity, supplierUrl, supplierMemo, supplierId);
if (rowsAffected > 0)
{
result = "Updated successfully";
}
else
{
result = "No rows were updated.";
}
}
catch (MySqlException ex)
{
Debug.WriteLine("Error (UpdateTblSupplier - MySqlException): " + ex.Message);
throw ex;
}
catch (Exception ex)
{
Debug.WriteLine("Error (UpdateTblSupplier): " + ex.Message);
throw ex;
}
return result;
}
}
}
主窗口.xaml.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Diagnostics;
using System.Data;
using System.IO;
namespace DatabaseMySqlHN
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
private HelperMySQL _helper = null;
private System.Data.DataTable _dt = null;
private int _currentDataGridIndex = 0;
private int _dbRowCount = 0;
public MainWindow()
{
InitializeComponent();
}
private void GetData()
{
InitializeHelper();
//get data from database
_dt = _helper.GetDataTblSupplier();
//populate data in DataGrid from DataTable
SupplierCode_DataGrid.DataContext = _dt;
//set value
_dbRowCount = _dt.Rows.Count;
//clear existing data
inpSupplierMemo.Document.Blocks.Clear();
}
private void GetMemo(int index)
{
byte[] dataArr = null;
if (_dt != null && index >= 0 && index < _dt.Rows.Count)
{
//set value
DataRow row = _dt.Rows[index];
if (row["supplier_Memo"] != null && row["supplier_Memo"] != DBNull.Value)
{
//get value from DataTable
dataArr = (byte[])row["supplier_Memo"];
}
if (dataArr != null)
{
//Debug.WriteLine("Length: " + dataArr.Length);
//clear existing data
inpSupplierMemo.Document.Blocks.Clear();
using (MemoryStream ms = new MemoryStream(dataArr))
{
//inpSupplierMemo.Document = new FlowDocument();
//load data
TextRange flowDocRange = new TextRange(inpSupplierMemo.Document.ContentStart, inpSupplierMemo.Document.ContentEnd);
flowDocRange.Load(ms, DataFormats.Rtf);
}
}
}
}
private byte[] GetRichTextFromFlowDocument(FlowDocument fDoc)
{
byte[] result = null;
//convert to string
if (fDoc != null)
{
TextRange tr = new TextRange(fDoc.ContentStart, fDoc.ContentEnd);
using (MemoryStream ms = new MemoryStream())
{
tr.Save(ms, DataFormats.Rtf);
result = ms.ToArray();
}
}
return result;
}
private void InitializeHelper()
{
if (_helper == null)
{
//servername, databaseName, userName, userPassword
_helper = new HelperMySQL("localhost", "HN", "testUser", "removed");
}
}
private void InsertRow(int dgIndex)
{
//since the DataGrid DataContext is set to the DataTable,
//the DataTable is updated when data is modified in the DataGrid
//get last row
DataRow row = _dt.Rows[_dt.Rows.Count - 1];
//get data from DataTable
string supplierCode = row["supplier_Code"].ToString();
string supplierName = row["supplier_Name"].ToString();
string supplierAddress1 = row["supplier_Address1"].ToString();
string supplierAddress2 = row["supplier_Address2"].ToString();
string supplier_Zip = row["supplier_Zip"].ToString();
string supplier_City = row["supplier_City"].ToString();
string supplier_Url = row["supplier_Url"].ToString();
//convert RTF to string
byte[] memo = GetRichTextFromFlowDocument(inpSupplierMemo.Document);
InitializeHelper();
string result = string.Empty;
result = _helper.InsertTblSupplier(supplierCode, supplierName, supplierAddress1, supplierAddress2, supplier_Zip, supplier_City, supplier_Url, memo);
UpdateStatus(result);
}
private void UpdateRow(int dgIndex)
{
//when DataGrid SelectionChanged occurs, the value of '_currentDataGridIndex' is set
//to DataGrid SelectedIndex
//get data from DataTable
DataRow row = _dt.Rows[_currentDataGridIndex];
int supplierId = (int)row["supplier_Id"];
string supplierCode = row["supplier_Code"].ToString();
string supplierName = row["supplier_Name"].ToString();
string supplierAddress1 = row["supplier_Address1"].ToString();
string supplierAddress2 = row["supplier_Address2"].ToString();
string supplier_Zip = row["supplier_Zip"].ToString();
string supplier_City = row["supplier_City"].ToString();
string supplier_Url = row["supplier_Url"].ToString();
//convert RTF to string
byte[] memo = GetRichTextFromFlowDocument(inpSupplierMemo.Document);
InitializeHelper();
string result = string.Empty;
result = _helper.UpdateTblSupplier(supplierId, supplierCode, supplierName, supplierAddress1, supplierAddress2, supplier_Zip, supplier_City, supplier_Url, memo);
UpdateStatus(result);
}
private void UpdateStatus(string msg)
{
if (!String.IsNullOrEmpty(msg))
{
if (!msg.StartsWith("Error") && !msg.StartsWith("Status"))
{
textBoxStatus.Text = String.Format("Status: {0} ({1})", msg, DateTime.Now.ToString("HH:mm:ss"));
Debug.WriteLine(String.Format("{0} - Status: {1}", DateTime.Now.ToString("HH:mm:ss"), msg));
}
else
{
textBoxStatus.Text = String.Format("{0} ({1})", msg, DateTime.Now.ToString("HH:mm:ss"));
Debug.WriteLine(String.Format("{0} - {1}", DateTime.Now.ToString("HH:mm:ss"), msg));
}
}
}
private void btnCreateTbl_Click(object sender, RoutedEventArgs e)
{
InitializeHelper();
//create table
string result = _helper.CreateTableSupplier();
UpdateStatus(result);
}
private void btnGetData_Click(object sender, RoutedEventArgs e)
{
GetData();
//update status
string msg = "Status: '" + _dt.Rows.Count + "' rows retrieved.";
UpdateStatus(msg);
}
private void SupplierCode_DataGrid_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
DataGrid dg = (DataGrid)sender;
//set value
_currentDataGridIndex = dg.SelectedIndex;
GetMemo(dg.SelectedIndex);
}
private void btnSaveUpdate_Click(object sender, RoutedEventArgs e)
{
int rowIndex = _currentDataGridIndex;
if (_dt.Rows.Count > _dbRowCount)
{
InsertRow(SupplierCode_DataGrid.SelectedIndex);
}
else
{
UpdateRow(SupplierCode_DataGrid.SelectedIndex);
}
GetData();
// Make sure the eddited row in the datagrid is selected
SupplierCode_DataGrid.SelectedIndex = rowIndex;
SupplierCode_DataGrid.Focus();
}
private void btnInsertTestData_Click(object sender, RoutedEventArgs e)
{
string result = string.Empty;
GetData();
//only insert test data if no rows exist
if (_dt.Rows.Count == 0)
{
string memo1Str = @"{\rtf1\ansi\ansicpg1252\deff0\nouicompat\deflang1033{\fonttbl{\f0\fnil\fcharset0 Calibri;}}
{\*\generator Riched20 10.0.19041}\viewkind4\uc1
\pard\sa200\sl276\slmult1\f0\fs22\lang9 Test Comments 1\par
}";
//convert to byte[]
byte[] memo1 = ASCIIEncoding.Default.GetBytes(memo1Str);
string memo2Str = @"{\rtf1\ansi\ansicpg1252\deff0\nouicompat\deflang1033{\fonttbl{\f0\fnil\fcharset0 Calibri;}}
{\*\generator Riched20 10.0.19041}\viewkind4\uc1
\pard\sa200\sl276\slmult1\f0\fs22\lang9 Test Comments 2\par
}";
//convert to byte[]
byte[] memo2 = ASCIIEncoding.Default.GetBytes(memo2Str);
InitializeHelper();
result = _helper.InsertTblSupplier("1", "Acme 123", "51 my street", null, "12345", "Some City", "https://www.myUrl1.com", memo1);
UpdateStatus(result);
result = _helper.InsertTblSupplier("2", "Acme 456", "52 my street", null, "12345", "Some City", "https://www.myUrl2.com", memo2);
UpdateStatus(result);
GetData();
}
else
{
UpdateStatus("Status: Data exists in table-test data not added.");
}
}
}
}
资源：
如何使用 XSLT 将 Richtext 图像从标准 WPF RichTextBox 转换为 HTML？
[英]How do I convert Richtext images from a standard WPF RichTextBox into HTML using XSLT?
如何在另一个 RichTextBox 中显示来自 RichTextBox 的内容
[英]How to display content from a RichTextBox in another RichTextBox
如何使用实体框架将 RichTextBox 内容存储到 WPF 中的 SQLServer 数据库
[英]How to Store RichTextBox Content to SQLServer Database in WPF using Entity Framework
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