Exception deleting a row from DataGrid bound to an ArrayList

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

I have a DataGrid bound to an ArrayList. When I delete a 'row' from the
ArrayList the DataGrid throws an IndexOutOfRangeException exception. I
constructed a very simple sample app that reproduces the problem (code
below). This sample simply populates the grid from the array (see Form1
constructor). When you click the button it deletes the current row (see
button1_click). At that point the exception is thrown.

If anyone could suggest what I'm doing wrong I'd appreciate it.

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace WindowsApplication1
{
public class Form1 : System.Windows.Forms.Form
{
private ArrayList m_oArrayList=new ArrayList();
private System.Windows.Forms.DataGrid m_oDataGrid;
private System.Windows.Forms.Button button1;

private System.ComponentModel.Container components = null;

public Form1()
{
InitializeComponent();

m_oArrayList.Add(new NameValuePair("NameOne","ValueOne"));
m_oArrayList.Add(new NameValuePair("NameTwo","ValueTwo"));
m_oArrayList.Add(new NameValuePair("NameThree","ValueThree"));
m_oArrayList.Add(new NameValuePair("NameFour","ValueFour"));
m_oArrayList.Add(new NameValuePair("NameFive","ValueFive"));
m_oArrayList.Add(new NameValuePair("NameSix","ValueSix"));
m_oArrayList.Add(new NameValuePair("NameSeven","ValueSeven"));

m_oDataGrid.SetDataBinding(m_oArrayList,"");
}

private void button1_Click(object sender, System.EventArgs e)
{
m_oArrayList.RemoveAt(m_oDataGrid.CurrentRowIndex);
m_oDataGrid.Refresh();
}

protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

private void InitializeComponent()
{
this.m_oDataGrid = new System.Windows.Forms.DataGrid();
this.button1 = new System.Windows.Forms.Button();

((System.ComponentModel.ISupportInitialize)(this.m_oDataGrid)).BeginInit();
this.SuspendLayout();
this.m_oDataGrid.DataMember = "";
this.m_oDataGrid.HeaderForeColor =
System.Drawing.SystemColors.ControlText;
this.m_oDataGrid.Location = new System.Drawing.Point(16, 40);
this.m_oDataGrid.Name = "m_oDataGrid";
this.m_oDataGrid.Size = new System.Drawing.Size(264, 176);
this.m_oDataGrid.TabIndex = 0;
this.button1.Location = new System.Drawing.Point(80, 8);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(64, 24);
this.button1.TabIndex = 1;
this.button1.Text = "delete";
this.button1.Click += new System.EventHandler(this.button1_Click);
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 229);
this.Controls.Add(this.button1);
this.Controls.Add(this.m_oDataGrid);
this.Name = "Form1";
this.Text = "Form1";

((System.ComponentModel.ISupportInitialize)(this.m_oDataGrid)).EndInit();
this.ResumeLayout(false);
}

[STAThread] static void Main()
{
Application.Run(new Form1());
}
}

public class NameValuePair
{
private string m_strName=string.Empty;
public string Name{get{return m_strName;} set{m_strName=value;}}

private string m_strValue=string.Empty;
public string Value{get{return m_strValue;} set{m_strValue=value;}}

public NameValuePair(string strName,string strValue)
{
m_strName = strName;
m_strValue =strValue;
}
}
}
 
I've found the following to be a reliable solution:

private void button1_Click(object sender, System.EventArgs e)
{
m_oArrayList.RemoveAt(m_oDataGrid.CurrentRowIndex);

CurrencyManager cm;
cm = (CurrencyManager)m_oDataGrid.BindingContex[m_oDataGrid.DataSource];
cm.Refresh();
}
 
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