C# 右键单击以选择列表框中的项目
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Right Click to select items in a ListBox
提问by Ipquarx
I'm trying to make a list of items that you can do several actions with by right-clicking and having a context menu come up. I've completed that, no problem whatsoever.
我正在尝试制作一个项目列表，您可以通过右键单击并出现上下文菜单来执行多个操作。我已经完成了，没有任何问题。
But I'd like to have it so that when you right click on a item, instead of leaving the current item selected, to select the item the mouse is over.
但是我想要它，以便当您右键单击一个项目时，而不是选择当前项目，而是选择鼠标悬停的项目。
I've researched this and other related questions, and I've tried to use indexFromPoint (which I found through my research) but whenever I right click on a item, it always just clears the selected item and doesn't show the context menu, as I have it set so that it wont appear if there is no selected item.
我研究了这个问题和其他相关问题，我尝试使用 indexFromPoint（我通过研究发现）但是每当我右键单击一个项目时，它总是只清除所选项目而不显示上下文菜单，因为我已经设置好了，如果没有选中的项目，它就不会出现。
Here is the code I'm currently using:
这是我目前使用的代码：
ListBox.SelectedIndex = ListBox.IndexFromPoint(Cursor.Position.X, Cursor.Position.Y);
采纳答案by demoncodemonkey
Handle ListBox.MouseDownand select the item in there. Like this:
处理ListBox.MouseDown并选择其中的项目。像这样：
private void listBox1_MouseDown(object sender, MouseEventArgs e)
{
listBox1.SelectedIndex = listBox1.IndexFromPoint(e.X, e.Y);
}
回答by Narottam Goyal
this one is working...
这个正在工作...
this.ListBox.MouseUp += new System.Windows.Forms.MouseEventHandler(this.List_RightClick);
private void List_RightClick(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Right)
{
int index = this.listBox.IndexFromPoint(e.Location);
if (index != ListBox.NoMatches)
{
listBox.Items[index];
}
}
}
回答by Dave Mateer
Can also get same behaviour by setting a MouseRightButtonUp event on the whole listbox then:
也可以通过在整个列表框上设置 MouseRightButtonUp 事件来获得相同的行为，然后：
private void AccountItemsT33_OnMouseRightButtonUp(object sender, MouseButtonEventArgs e)
{
// If have selected an item via left click, then do a right click, need to disable that initial selection
AccountItemsT33.SelectedIndex = -1;
VisualTreeHelper.FindElementsInHostCoordinates(e.GetPosition(null), (sender as ListBox)).OfType<ListBoxItem>().First().IsSelected = true;
}
