已选中列表框项目 | 已选中列表框项目

本文介绍了已选中列表框项目的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在使用列出了几个复选框项目的列表框。

I'm using a listbox with several check boxed items listed.

当我点击列表框时，我需要确定是否已选中所选项目。

When I click the listbox I need to determine if the selected item is checked already.

如果是，则取消选中它 - 如果不是，则检查它。

If it is then uncheck it - if it isn't then check it.

我的代码.. 。

&NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; bool bool_adders = lstbx_TMDAdders.GetItemChecked（0）; //项目索引0是否已检查？

&NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP;开关（bool_adders）

&NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; {

&NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; case true：//已经检查过方框

&NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; lstbx_TMDAdders.SetItemChecked（0，false）; //这应该取消选中该框，但不是。

&NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP;休息;

&NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; case false：//盒子尚未检查

&NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; lstbx_TMDAdders.SetItemChecked（0，true）; //这将勾选方框

&NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP;休息;

&NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; }

bool bool_adders = lstbx_TMDAdders.GetItemChecked(0); // is item index 0 checked?
switch (bool_adders)
{
case true: //box is already checked
lstbx_TMDAdders.SetItemChecked(0, false); // this should uncheck the box but doesn't.
break;
case false: //box is not already checked
lstbx_TMDAdders.SetItemChecked(0, true); //this will check the box
break;

}

我做错了什么？显然是因为它不起作用。

Am I doing something wrong? obviously so because it isn't working.

使用VS 2015 C＃

Using VS 2015 C#

请告诉我。

tac

推荐答案

听起来您正在使用CheckedListBox而不是ListBox。您可以订阅以下事件ItemCheck。

Sounds like you are working with a CheckedListBox not a ListBox. You can subscribe to the following event ItemCheck.

checkedListBox1.ItemCheck += CheckedListBox1_ItemCheck;

那么

private void CheckedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)
{
    if (e.CurrentValue == CheckState.Checked)
    {
        // do something
    }
    else if (e.CurrentValue == CheckState.Unchecked)
    {
        // do something else
    }
}

查看所有内容（包括当前值）

To see everything (including what the current value is going to be)

private void CheckedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)
{
    if (e.CurrentValue == CheckState.Checked)
    {
        // do something
    }
    else if (e.CurrentValue == CheckState.Unchecked)
    {
        // do something else
    }
    Console.WriteLine(

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