What is the usage of ContextMenu in WPF?

In WPF, ContextMenu is used to create a pop-up menu, typically used with other controls like Button or TextBox to display menu options when a user right-clicks on the control.

You can use the ContextMenu by following these steps:

1. In XAML, you can define the content of a ContextMenu by adding MenuItem elements to create menu items. For example:

<ContextMenu>
    <MenuItem Header="菜单项1" Click="MenuItem_Click" />
    <MenuItem Header="菜单项2" Click="MenuItem_Click" />
</ContextMenu>

1. Attach ContextMenu to other controls: You can attach a ContextMenu to other controls by setting it as the value of the control’s ContextMenuStrip property. For example, attaching a ContextMenu to a Button:

<Button Content="右键点击我">
    <Button.ContextMenu>
        <ContextMenu>
            <MenuItem Header="菜单项1" Click="MenuItem_Click" />
            <MenuItem Header="菜单项2" Click="MenuItem_Click" />
        </ContextMenu>
    </Button.ContextMenu>
</Button>

1. Handling menu item click events: in the backend code, handlers can be added for the Click event of each menu item to perform specific operations. For example:

private void MenuItem_Click(object sender, RoutedEventArgs e)
{
    MenuItem menuItem = (MenuItem)sender;
    string header = menuItem.Header.ToString();
    MessageBox.Show("点击了菜单项：" + header);
}

In the above steps, when defining the content of the ContextMenu, separators, icons, and other styles can be added as needed. The ContextMenu also supports using commands to handle clicks on menu items, as well as dynamically generating menu items through DataBinding.