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[英]C#, Winform, Inserting data into local database and viewing it in DataGridVIew
[英]DataGridView not showing the data after inserting in local database
我创建了一个链接到本地数据库的应用程序。 它运作良好,但是唯一的问题是,当我按下插入按钮后,只有在关闭并重新打开应用程序之后,数据才会插入到db中,但不会显示在GridView中。 按下插入值的按钮后,如何使它立即显示数据? 谢谢 !
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;
using System.Data.SqlServerCe;
using System.IO;
namespace Gradinita
{
public partial class Grupa : Form
{
string nume = "";
List<Label> labels = new List<Label>();
public Grupa(string nume)
{
InitializeComponent();
this.nume = nume;
}
private void Grupa_Load(object sender, EventArgs e)
{
// TODO: This line of code loads data into the 'grupeDataSet8.copii' table. You can move, or remove it, as needed.
this.copiiTableAdapter2.Fill(this.grupeDataSet8.copii);
// TODO: This line of code loads data into the 'grupeDataSet7.copii' table. You can move, or remove it, as needed.
this.copiiTableAdapter1.Fill(this.grupeDataSet7.copii);
// TODO: This line of code loads data into the 'grupeDataSet3.copii' table. You can move, or remove it, as needed.
this.copiiTableAdapter.Fill(this.grupeDataSet3.copii);
var connString = (@"Data Source=" + System.IO.Path.Combine(System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location)) + @"\Grupe.sdf");
using (var conn = new SqlCeConnection(connString))
{
try
{
conn.Open();
var query = "SELECT * FROM grupe WHERE Nume='" + nume + "'";
var command = new SqlCeCommand(query, conn);
var dataAdapter = new SqlCeDataAdapter(command);
var dataTable = new DataTable();
dataAdapter.Fill(dataTable);
label1.Text = dataTable.Rows[0][0].ToString();
label2.Text = dataTable.Rows[0][1].ToString();
label3.Text = dataTable.Rows[0][2].ToString();
label4.Text = dataTable.Rows[0][3].ToString();
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
}
private void button1_Click(object sender, EventArgs e)
{
if (checkBox1.Checked)
{
label5.Text = ("1");
}
if (checkBox2.Checked)
{
label5.Text = ("0");
}
textBox1.Text = (Convert.ToInt32(textBox5.Text) - Convert.ToInt32(textBox6.Text)).ToString();
var connString = (@"Data Source=" + Directory.GetParent(Directory.GetCurrentDirectory()).Parent.FullName + @"\Grupe.sdf");
using (var conn = new SqlCeConnection(connString))
{
try
{
conn.Open();
var query = "INSERT INTO copii(prezenta, Nume, Prenume, Program, Taxa, Achitat, Diferenta) VALUES('" + label5.Text + "', '" + textBox2.Text.Trim() + "', '" + textBox3.Text.Trim() + "', '" + textBox4.Text.Trim() + "', '" + textBox5.Text.Trim() + "', '"+ textBox6.Text.Trim()+"', '"+ textBox1.Text.Trim() +"');";
MessageBox.Show(query);
var command = new SqlCeCommand(query, conn);
command.ExecuteNonQuery();
dataGridView1.Refresh(); //not working obviously
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
}
}
您需要重新查询数据并重新绑定数据表。
就像是:
dataGridView1.DataSource = SomeDataTableSource;
dataGridView1.DataBind();
我设法通过将网格重新添加到控件中来绕过此操作。 首先,将网格复制到变量中,然后将其从父控件中删除,然后将变量添加到该控件的控件中。
var grid = dataGridView1.Parent.Controls["dataGridView1"];
var ctr = dataGridView1.Parent;
ctr.Controls.Remove(dataGridView1);
ctr.Controls.Add(grid);
它没有经过测试,我可能会误输入一些名称,因为我在这里没有安装VS,但是您明白了。 不是最优雅的解决方案,但它对我有用。 您也可以尝试dataGridView1.Refresh()-它对我不起作用。
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