Manage CheckedListBox ItemCheck 事件在检查项目之后运行而不是之前

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Manage CheckedListBox ItemCheck event to run after an item checked not before

我在 C# 窗口窗体应用程序中使用 CheckedListBox。

我想在选中或未选中一个项目之后做某事，但 ItemCheck 事件在项目选中/未选中之前运行。

我该怎么做？

CheckedListBox.ItemCheck Event

The check state is not updated until after the ItemCheck event occurs.

要在检查项目后运行一些代码，您应该使用解决方法。

最佳选择

您可以使用此选项(感谢 Hans Passant 的这篇文章)：

private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)

{

  this.BeginInvoke(new Action(() =>

  {

    //Do the after check tasks here

  }));

}

var checkedIndices = this.checkedListBox1.CheckedIndices.Cast<int>().ToList();

if (e.NewValue == CheckState.Checked)

  checkedIndices.Add(e.Index);

else

  if(checkedIndices.Contains(e.Index))

    checkedIndices.Remove(e.Index);



//now you can do what you need to checkedIndices

//Here if after check but you should use the local variable checkedIndices 

//to find checked indices

private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)

{

  var control = (CheckedListBox)sender;

  // Remove handler

  control.ItemCheck -= checkedListBox_ItemCheck;



  control.SetItemCheckState(e.Index, e.NewValue);



  // Add handler again

  control.ItemCheck += checkedListBox_ItemCheck;



  //Here is After Check, do additional stuff here   

}
  private void clbOrg_ItemCheck(object sender, ItemCheckEventArgs e)

{

  CheckedListBox clb = (CheckedListBox)sender;

  // Switch off event handler

  clb.ItemCheck -= clbOrg_ItemCheck;

  clb.SetItemCheckState(e.Index, e.NewValue);

  // Switch on event handler

  clb.ItemCheck += clbOrg_ItemCheck;



  // Now you can go further

  CallExternalRoutine();    

}

private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)

{

  var checkBoxName = checkedListBox1.Items[e.Index];

  Console.WriteLine("Current {0}, New {1} , value {2}", e.CurrentValue, e.NewValue, checkBoxName);

}

另一种选择

  • 如果在ItemCheck事件的中间，你需要知道item的状态，你应该使用e.NewValue而不是使用checkedListBox1.GetItemChecked(i)

  • 如果您需要将检查索引列表传递给方法，请执行以下操作：

使用代码：

private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)

{

  this.BeginInvoke(new Action(() =>

  {

    //Do the after check tasks here

  }));

}

var checkedIndices = this.checkedListBox1.CheckedIndices.Cast<int>().ToList();

if (e.NewValue == CheckState.Checked)

  checkedIndices.Add(e.Index);

else

  if(checkedIndices.Contains(e.Index))

    checkedIndices.Remove(e.Index);



//now you can do what you need to checkedIndices

//Here if after check but you should use the local variable checkedIndices 

//to find checked indices

private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)

{

  var control = (CheckedListBox)sender;

  // Remove handler

  control.ItemCheck -= checkedListBox_ItemCheck;



  control.SetItemCheckState(e.Index, e.NewValue);



  // Add handler again

  control.ItemCheck += checkedListBox_ItemCheck;



  //Here is After Check, do additional stuff here   

}
  private void clbOrg_ItemCheck(object sender, ItemCheckEventArgs e)

{

  CheckedListBox clb = (CheckedListBox)sender;

  // Switch off event handler

  clb.ItemCheck -= clbOrg_ItemCheck;

  clb.SetItemCheckState(e.Index, e.NewValue);

  // Switch on event handler

  clb.ItemCheck += clbOrg_ItemCheck;



  // Now you can go further

  CallExternalRoutine();    

}

private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)

{

  var checkBoxName = checkedListBox1.Items[e.Index];

  Console.WriteLine("Current {0}, New {1} , value {2}", e.CurrentValue, e.NewValue, checkBoxName);

}

另一个选项

在ItemCheck事件的中间，移除ItemCheck的handler，SetItemCheckState，然后添加handler egain。

private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)

{

  this.BeginInvoke(new Action(() =>

  {

    //Do the after check tasks here

  }));

}

var checkedIndices = this.checkedListBox1.CheckedIndices.Cast<int>().ToList();

if (e.NewValue == CheckState.Checked)

  checkedIndices.Add(e.Index);

else

  if(checkedIndices.Contains(e.Index))

    checkedIndices.Remove(e.Index);



//now you can do what you need to checkedIndices

//Here if after check but you should use the local variable checkedIndices 

//to find checked indices

private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)

{

  var control = (CheckedListBox)sender;

  // Remove handler

  control.ItemCheck -= checkedListBox_ItemCheck;



  control.SetItemCheckState(e.Index, e.NewValue);



  // Add handler again

  control.ItemCheck += checkedListBox_ItemCheck;



  //Here is After Check, do additional stuff here   

}
  private void clbOrg_ItemCheck(object sender, ItemCheckEventArgs e)

{

  CheckedListBox clb = (CheckedListBox)sender;

  // Switch off event handler

  clb.ItemCheck -= clbOrg_ItemCheck;

  clb.SetItemCheckState(e.Index, e.NewValue);

  // Switch on event handler

  clb.ItemCheck += clbOrg_ItemCheck;



  // Now you can go further

  CallExternalRoutine();    

}

private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)

{

  var checkBoxName = checkedListBox1.Items[e.Index];

  Console.WriteLine("Current {0}, New {1} , value {2}", e.CurrentValue, e.NewValue, checkBoxName);

}

尝试更多地寻找答案，因为这里是

private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)

{

  this.BeginInvoke(new Action(() =>

  {

    //Do the after check tasks here

  }));

}

var checkedIndices = this.checkedListBox1.CheckedIndices.Cast<int>().ToList();

if (e.NewValue == CheckState.Checked)

  checkedIndices.Add(e.Index);

else

  if(checkedIndices.Contains(e.Index))

    checkedIndices.Remove(e.Index);



//now you can do what you need to checkedIndices

//Here if after check but you should use the local variable checkedIndices 

//to find checked indices

private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)

{

  var control = (CheckedListBox)sender;

  // Remove handler

  control.ItemCheck -= checkedListBox_ItemCheck;



  control.SetItemCheckState(e.Index, e.NewValue);



  // Add handler again

  control.ItemCheck += checkedListBox_ItemCheck;



  //Here is After Check, do additional stuff here   

}
  private void clbOrg_ItemCheck(object sender, ItemCheckEventArgs e)

{

  CheckedListBox clb = (CheckedListBox)sender;

  // Switch off event handler

  clb.ItemCheck -= clbOrg_ItemCheck;

  clb.SetItemCheckState(e.Index, e.NewValue);

  // Switch on event handler

  clb.ItemCheck += clbOrg_ItemCheck;



  // Now you can go further

  CallExternalRoutine();    

}

private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)

{

  var checkBoxName = checkedListBox1.Items[e.Index];

  Console.WriteLine("Current {0}, New {1} , value {2}", e.CurrentValue, e.NewValue, checkBoxName);

}

还有链接：

检查项目后会触发哪个 CheckedListBox 事件？

您可以在 ItemCheck 上连接一个事件。您可以通过右键单击复选框列表并选择属性来完成。在右侧您将看到属性选项卡，单击事件选项卡按钮并找到 ItemCheck 事件并双击它。它将根据您的复选框列表名称为您生成一个事件方法，如下所示。

然后，您可以使用下面的代码验证选中/选中的复选框。

private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)

{

  this.BeginInvoke(new Action(() =>

  {

    //Do the after check tasks here

  }));

}

var checkedIndices = this.checkedListBox1.CheckedIndices.Cast<int>().ToList();

if (e.NewValue == CheckState.Checked)

  checkedIndices.Add(e.Index);

else

  if(checkedIndices.Contains(e.Index))

    checkedIndices.Remove(e.Index);



//now you can do what you need to checkedIndices

//Here if after check but you should use the local variable checkedIndices 

//to find checked indices

private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)

{

  var control = (CheckedListBox)sender;

  // Remove handler

  control.ItemCheck -= checkedListBox_ItemCheck;



  control.SetItemCheckState(e.Index, e.NewValue);



  // Add handler again

  control.ItemCheck += checkedListBox_ItemCheck;



  //Here is After Check, do additional stuff here   

}
  private void clbOrg_ItemCheck(object sender, ItemCheckEventArgs e)

{

  CheckedListBox clb = (CheckedListBox)sender;

  // Switch off event handler

  clb.ItemCheck -= clbOrg_ItemCheck;

  clb.SetItemCheckState(e.Index, e.NewValue);

  // Switch on event handler

  clb.ItemCheck += clbOrg_ItemCheck;



  // Now you can go further

  CallExternalRoutine();    

}

private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)

{

  var checkBoxName = checkedListBox1.Items[e.Index];

  Console.WriteLine("Current {0}, New {1} , value {2}", e.CurrentValue, e.NewValue, checkBoxName);

}
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