Hello!
A complete example where binding works in one directions only.
I have a DataGridView and when I click on the event handler
BtnCreateTextBox_Click a new TextBox is created.
and now I enter a name in the DataGridView cell and click enter and the name
is displayed in the TextBox which is perfect.
Now I do the same with three TextBoxes so I have three rows in the
datagridView which have the namnes
aaa
bbb
ccc
and each of these namnes is displayed in each TextBox.
Now I place the cursor on the last row in the DataGridView and change the
name aaa to 111 in the TextBox and change focus to the TextBox where the
name is bbb. The is no change at all in the DataGridView cell aaa. Now I
change bbb in the TextBox to 222 and change focus to the last textBox where
ccc is displayed and again no change at all in the dataGridView.
Now I change ccc in the TextBox to 333 and now I can see that ccc in the
DataGridView is changed to 333 because
the cursor was placed in this cell.
So why does it not work in both direction ?
I use this binding statement
textBox.DataBindings.Add("Text", thisPlayer, "Name",true,
DataSourceUpdateMode.OnPropertyChanged);
which should cause binding to work in both directions.
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 Testing
{
public partial class Form1 : Form
{
private int xpos = 0;
private int ypos = 0;
private BindingSource bindingSource = new BindingSource();
private List<Player> players = new List<Player>();
private TextBox textBox;
private List<TextBox> textBoxes = new List<TextBox>();
public Form1()
{
InitializeComponent();
bindingSource.DataSource = players;
dataGridView1.DataSource = bindingSource;
}
private void BtnCreateTextBox_Click(object sender, EventArgs e)
{
textBox = new TextBox();
textBoxes.Add(textBox);
textBox.Location = new Point(xpos += 20, ypos += 20);
panel1.Controls.Add(textBox);
}
private void dataGridView1_CellValueChanged(object sender,
DataGridViewCellEventArgs e)
{
if (textBox == null)
return;
Player thisPlayer = players[e.RowIndex];
foreach (TextBox tb in textBoxes)
{
if (tb.Text == thisPlayer.Name)
{
tb.DataBindings.Remove(tb.DataBindings["Text"]);
textBox = tb;
break;
}
}
textBox.DataBindings.Add("Text", thisPlayer, "Name",true,
DataSourceUpdateMode.OnPropertyChanged);
}
}
public class Player
{
private int playerID;
private string name;
public Player(int ID, string name)
{
this.playerID = ID;
this.name = name;
}
public Player()
{}
public string Name
{
get { return name; }
set { name = value; }
}
public int PlayerID
{
get { return playerID; }
set { playerID = value; }
}
}
//A copy paste from Form1.Designer.cs
partial class Form1
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be
disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.dataGridView1 = new System.Windows.Forms.DataGridView();
this.BtnCreateTextBox = new System.Windows.Forms.Button();
this.panel1 = new System.Windows.Forms.Panel();
((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).BeginInit();
this.SuspendLayout();
//
// dataGridView1
//
this.dataGridView1.ColumnHeadersHeightSizeMode =
System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
this.dataGridView1.Location = new System.Drawing.Point(12, 137);
this.dataGridView1.Name = "dataGridView1";
this.dataGridView1.Size = new System.Drawing.Size(267, 121);
this.dataGridView1.TabIndex = 0;
this.dataGridView1.CellValueChanged += new
System.Windows.Forms.DataGridViewCellEventHandler(this.dataGridView1_CellValueChanged);
//
// BtnCreateTextBox
//
this.BtnCreateTextBox.Location = new System.Drawing.Point(285,
167);
this.BtnCreateTextBox.Name = "BtnCreateTextBox";
this.BtnCreateTextBox.Size = new System.Drawing.Size(153, 23);
this.BtnCreateTextBox.TabIndex = 1;
this.BtnCreateTextBox.Text = "CreateTextBox";
this.BtnCreateTextBox.UseVisualStyleBackColor = true;
this.BtnCreateTextBox.Click += new
System.EventHandler(this.BtnCreateTextBox_Click);
//
// panel1
//
this.panel1.Location = new System.Drawing.Point(12, 12);
this.panel1.Name = "panel1";
this.panel1.Size = new System.Drawing.Size(405, 108);
this.panel1.TabIndex = 2;
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(444, 270);
this.Controls.Add(this.panel1);
this.Controls.Add(this.BtnCreateTextBox);
this.Controls.Add(this.dataGridView1);
this.Name = "Form1";
this.Text = "Form1";
((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).EndInit();
this.ResumeLayout(false);
}
#endregion
private System.Windows.Forms.DataGridView dataGridView1;
private System.Windows.Forms.Button BtnCreateTextBox;
private System.Windows.Forms.Panel panel1;
}
}
//Tony
Similar Threads
