c# WinForms ListView 按选择分组

本文关键字：选择 WinForms ListView | 更新日期: 2023-09-27 18:35:56

>我有一个列表视图，它有 已检查 = true 和两组（已选择和未选择）。在选中时，我希望将项目移动到相应的组，但似乎移动组会导致再次触发项目检查事件。

private void Form1_Load(object sender, EventArgs e)
{
    listView1.ItemChecked += listView1_ItemChecked;
}
private void listView1_ItemChecked(object sender, ItemCheckedEventArgs e)
{
    foreach (ListViewItem item in listView1.Items)
    {
        if (item.Checked && item.Group != listView1.Groups["grpSelected"])
        {
            Console.WriteLine("Checked = true [1] : " + item.Text);
            item.Group = listView1.Groups["grpSelected"];
            Console.WriteLine("Checked = true [2] : " + item.Text);
            break;
        }
        if (!item.Checked && item.Group != listView1.Groups["grpNotSelected"])
        {
            Console.WriteLine("Checked = false [1] : " + item.Text);
            item.Group = listView1.Groups["grpNotSelected"];
            Console.WriteLine("Checked = false [2] : " + item.Text);
            break;
        }
    }
}

输出中的结果来自已检查 --> ！检查

Checked = false [1] : test0
Checked = true [1] : test0
Checked = true [2] : test0
Checked = false [2] : test0

有没有更好的方法来获得此功能？还是解决问题的方法？目前我需要双击才能获得所需的效果，但它非常丑陋！

编辑

这奏效了，但似乎也是错误的...

private void listView1_ItemChecked(object sender, ItemCheckedEventArgs e)
{
    listView1.ItemChecked -= listView1_ItemChecked;
    foreach (ListViewItem item in listView1.Items)
    {
        if (item.Checked && item.Group != listView1.Groups["grpSelected"])
        {
            item.Group = listView1.Groups["grpSelected"];
            item.Checked = true;
            break;
        }
        if (!item.Checked && item.Group != listView1.Groups["grpNotSelected"])
        {
            item.Group = listView1.Groups["grpNotSelected"];
            item.Checked = false;
            break;
        }
    }
    listView1.ItemChecked += listView1_ItemChecked;
}

c# WinForms ListView 按选择分组

试试这个：

//Suppose the first Group is Checked, the second Group is Unchecked    
//ItemCheck event handler for your listView1
private void listView1_ItemCheck(object sender, ItemCheckEventArgs e){
   listView1.Items[e.Index].Group = listView1.Groups[e.NewValue == CheckState.Checked ? 0 : 1];
}
//you need to do this initially to group your items correctly
foreach (ListViewItem item in listView1.Items)
     item.Group = listView1.Groups[item.Checked ? 0 : 1];
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