[英]How Can I Generate Dynamic Buttons in Winforms based on the data table values from Database in C#?
实际上，我对 C# 还很陌生。 我在数据库中有两个表，分别名为“Categories”和“MenuItems”。 我想要的是当表单加载时，我应该从数据库中获取所有类别行并将它们显示为动态生成的按钮上的文本（按钮数量取决于类别行数），我已经使用以下代码完成了它：
private void Form1_Load(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection();
con.ConnectionString = "Data Source=Shezi;Initial Catalog=RMS;Integrated Security=True";
SqlCommand cmd = new SqlCommand();
con.Open();
string commandText = "select Categories From Categories";
cmd = new SqlCommand(commandText, con);
SqlDataReader sdr = cmd.ExecuteReader();
DataTable dt = new DataTable();
dt.Load(sdr);
con.Close();
int btnName = 0;
if (dt.Rows.Count>0)
{
btnName++;
int PosY = 5;
int rowCount = -1;
int numOfRows = dt.Rows.Count;
for(int i=0; i<numOfRows; i++)
{
rowCount++;
foreach (DataRow row in dt.Rows)
{
variables.btnText = dt.Rows[rowCount].Field<string>(0);
}
Button button = new Button();
button.Enabled = true;
button.Text = variables.btnText;
button.BackColor = Color.Green;
button.ForeColor = Color.White;
button.Width = 150;
button.Height = 50;
button.Name = "button" + btnName;
button.Location = new Point(-2, PosY);
button.Font = new Font("Georgia", 12);
button.Click += Button_Click;
panel.Controls.Add(button);
PosY += 55;
}
}
}
我上面的代码确实根据数据库中的类别行生成动态按钮，这是我的主要问题，我想要的是当用户单击任何动态生成的按钮时，应该在菜单项中搜索该按钮的文本（显然是文本按钮的将是类别文本），应用程序应在 MenuItems 行中搜索该文本并过滤掉针对该类别保存的所有 MenuItem（例如，如果动态生成的按钮具有文本“Burger”，则程序应从汉堡中获取所有菜单项类别并显示在更多新生成的动态按钮上），类似地，如果单击类别为 Cheese 的按钮，它应该获取并创建新的动态按钮并填充 Cheese 菜单项。 到目前为止，这就是我试图根据按钮点击获得新的动态按钮的方法：
private void btn1_Click(object sender, EventArgs e)
{
dt = manager.GetMenuItems(menuItems);
var count = dt.Rows.Count;
//int btnName = 0;
int PosX = 160;
int rowCount = -1;
for (int i = 0; i < count; i++)
{
//btnName++;
rowCount++;
foreach (DataRow row in dt.Rows)
{
menuItems.MenuText = dt.Rows[rowCount].Field<string>(0);
//categories.btnText = row.Field<string>("Categories", DataRowVersion.Original);//do not undo
DataView dv = dt.DefaultView;
dv.RowFilter = "MenuItem = MenuItem";
DataTable dt1 = dv.ToTable();
menuItems.MenuText = dt1.ToString();
}
//string btnText = count.ToString();
Button btn1 = new Button();
btn1.Enabled = true;
btn1.Text = menuItems.MenuText;
btn1.BackColor = Color.Navy;
btn1.ForeColor = Color.White;
btn1.Width = 150;
btn1.Height = 50;
btn1.Name = "btn1";
btn1.Location = new Point(PosX, 10);
btn1.Font = new Font("Georgia", 12);
btn1.Click += new EventHandler(btn1_Click);
pnlCategories.Controls.Add(btn1);
PosX += 150;
//var newvalue = ds.Tables[0].Rows[1].ItemArray[0].ToString();
}
}
我已经搜索了很多方法，但找不到任何类似的东西，我也在 stackoverflow 上尝试了不同的线程，但没有运气，需要帮助！
尝试以下代码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication62
{
public partial class Form1 : Form
{
static DataTable dt = new DataTable();
const int NUMBER_OF_BUTTON_COLUMNS = 6;
const int BUTTON_HEIGHT = 50;
const int BUTTON_WIDTH = 50;
const int BUTTON_MARGIN = 50;
public Form1()
{
InitializeComponent();
for (int i = 0; i < 20; i++)
{
dt.Columns.Add("Col_" + i.ToString(), typeof(string));
}
AddButtons();
}
public void AddButtons()
{
String[] columnNames = dt.Columns.Cast<DataColumn>().Select(x => x.ColumnName).ToArray();
for(int i = 0; i < columnNames.Length; i++)
{
Button button = new Button();
button.Text = columnNames[i];
int column = i % NUMBER_OF_BUTTON_COLUMNS;
int row = i / NUMBER_OF_BUTTON_COLUMNS;
button.Left = column * (BUTTON_MARGIN + BUTTON_WIDTH);
button.Top = row * (BUTTON_MARGIN + BUTTON_HEIGHT);
button.Width = BUTTON_WIDTH;
button.Height = BUTTON_HEIGHT;
this.Controls.Add(button);
button.Click +=new EventHandler(Button_Click);
}
}
public void Button_Click(object sender, EventArgs e)
{
Button button = sender as Button;
string buttonName = button.Text;
}
}
}
我希望这是你需要的
void GenerateButton(FlowLayoutPanel pnl)
{
Button CategoryButton = new Button
{
Enabled = true,
Text = ItemName,
BackColor = Color.Green,
ForeColor = Color.White,
Width = 150,
Height = 50,
Name = ItemName,
Font = new Font("Georgia", 12)
};
void SearchItemsInThisCategory(object sender , EventArgs e)
{
foreach(Button button in pnl.Controls.OfType<Button>()) //Remove others categories buttons
{
if (button.Name != CategoryButton.Name)
{
pnl.Controls.Remove(button);
}
}
using (SqlConnection con = new SqlConnection("Data Source=Shezi;Initial Catalog=RMS;Integrated Security=True"))
{
SqlDataAdapter dataAdapter = new SqlDataAdapter($"select {CategoryButton.Text} From MenuItems", con);
DataTable dt = new DataTable();
dataAdapter.Fill(dt);
foreach (DataRow row in dt.Rows)
{
ItemName = row[CategoryButton.Text].ToString();
GenerateButton(pnl);
}
}
}
CategoryButton.Click += SearchItemsInThisCategory;
pnl.Controls.Add(CategoryButton);
}
public void GetAllCategories(FlowLayoutPanel pnl)
{
using (SqlConnection con = new SqlConnection("Data Source=Shezi;Initial Catalog=RMS;Integrated Security=True"))
{
SqlDataAdapter dataAdapter = new SqlDataAdapter("select Categories From Categories", con);
DataTable dt = new DataTable();
dataAdapter.Fill(dt);
foreach (DataRow row in dt.Rows)
{
ItemName = row["Categories"].ToString(); //Assume Categories columns contains all categories
GenerateButton(pnl);
}
}
}
测试
public string ItemName { get; set; }
private void Form1_Load(object sender, EventArgs e)
{
GetAllCategories(flowLayoutPanel1);
}
解释
我建议你使用 FlowLayoutPanel 而不是 Panel
我已经声明了名为 ItemName 的属性，它将接收 Form1_Load 中的每个 CategoryName 并且 CategoryButton Name 和 Text 将等于 ItemName
我将 onClick 事件添加到生成的按钮 - 首先删除除自身之外的其他按钮 - 然后它将使用它的文本在 MenutItem 表中仅选择“ColumnName”，然后它检索所有行数据并将每行单元格值再次分配给 GeneratedButton
**嗨，别介意专家我通过获取动态按钮文本然后在数据库中搜索它以获取针对它存储的菜单项解决了这个问题，这是代码：**
using BusinessManager;
using DataAccess;
using Domain;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace RestuarnetManagementSystem.Softangles
{
public partial class POS : Form
{
Manager manager = new Manager();
DataClass dataClass = new DataClass();
Categories categories = new Categories();
DataTable dt = new DataTable();
DataSet ds = new DataSet();
ButtonData bd = new ButtonData();
MenuItems menuItems = new MenuItems();
int btnName = 0;
public POS()
{
InitializeComponent();
}
private void tabPage1_Click(object sender, EventArgs e)
{
}
public void panel7_Paint(object sender, PaintEventArgs e)
{
//ds.Tables[0].Rows[i].ItemArray[0].ToString()
//dt = manager.DeployButtonCategoryText(categories);
dt = manager.DeployButtonCategoryText(categories);
var count = dt.Rows.Count;
//int btnName = 0;
int PosY = 5;
int rowCount = -1;
for (int i = 0; i < count; i++)
{
//btnName++;
rowCount++;
btnName++;
foreach (DataRow row in dt.Rows)
{
categories.btnText = dt.Rows[rowCount].Field<string>(0);
//categories.btnText = row.Field<string>("Categories", DataRowVersion.Original);
}
//string btnText = count.ToString();
Button btn1 = new Button();
btn1.Enabled = true;
btn1.Text = categories.btnText;
categories.btnText = btn1.Text;
btn1.BackColor = Color.Navy;
btn1.ForeColor = Color.White;
btn1.Width = 150;
btn1.Height = 50;
btn1.Name = "btn1"+btnName;
btn1.Location = new Point(-2, PosY);
btn1.Font = new Font("Georgia", 12);
btn1.Click += new EventHandler(btn1_Click);
pnlCategories.Controls.Add(btn1);
PosY += 55;
//var newvalue = ds.Tables[0].Rows[1].ItemArray[0].ToString();
}
}
private void POS_Load(object sender, EventArgs e)
{
}
private void btn1_Click(object sender, EventArgs e)
{
pnlMenuItems.Controls.Clear();
Button btn = sender as Button;
menuItems.FindMenuItems = btn.Text;
dt = manager.GetMenuItems(menuItems);
int rowCount = dt.Rows.Count;
int counter = -1;
if(dt.Rows.Count>0)
{
int PosX = 100;
for (int i = 0; i < rowCount; i++)
{
btnName++;
counter++;
foreach (DataRow row in dt.Rows)
{
menuItems.MenuText = dt.Rows[counter].Field<string>(0);
}
Button button = new Button();
button.Enabled = true;
button.Text = menuItems.MenuText;
button.BackColor = Color.Navy;
button.ForeColor = Color.White;
button.Font = new Font("Georgia", 12);
button.Location = new Point(PosX, 10);
button.Width = 150;
button.Height = 50;
button.Name = "button" + btnName;
button.Click += new EventHandler(button_Click);
pnlMenuItems.Controls.Add(button);
PosX += 150;
}
}
else
{
MessageBox.Show("Failed!");
}
//dt = manager.GetMenuItems(menuItems);
//int count = dt.Rows.Count;
////int btnName = 0;
//int PosX = 160;
//int rowCount = -1;
//for (int i = 0; i < count; i++)
//{
// //btnName++;
// rowCount++;
// foreach (DataRow row in dt.Rows)
// {
// menuItems.MenuText = dt.Rows[rowCount].Field<string>(0);
// }
// //string btnText = count.ToString();
// Button btn2 = new Button();
// btn2.Enabled = true;
// btn2.Text = menuItems.MenuText;
// btn2.BackColor = Color.Navy;
// btn2.ForeColor = Color.White;
// btn2.Width = 150;
// btn2.Height = 50;
// btn2.Name = "btn2";
// btn2.Location = new Point(PosX, 10);
// btn2.Font = new Font("Georgia", 12);
// btn2.Click += new EventHandler(btn2_Click);
// pnlCategories.Controls.Add(btn2);
// PosX += 150;
// //var newvalue = ds.Tables[0].Rows[1].ItemArray[0].ToString();
}
private void button_Click(object sender, EventArgs e)
{
MessageBox.Show("Test");
}
}
}
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