C# 如何绑定ContextMenu';单击某个函数的处理程序
我有一些XAML,如下所示:C# 如何绑定ContextMenu';单击某个函数的处理程序,c#,wpf,wpf-controls,C#,Wpf,Wpf Controls,我有一些XAML,如下所示: <UserControl x:Class="Foo"> <UserControl.Resources> <ContextMenu x:Key="ContextMenu1"> <MenuItem Header="Command 1a"/> <MenuItem Header="Command 1b"/> </ContextMenu> <Con
<UserControl x:Class="Foo">
<UserControl.Resources>
<ContextMenu x:Key="ContextMenu1">
<MenuItem Header="Command 1a"/>
<MenuItem Header="Command 1b"/>
</ContextMenu>
<ContextMenu x:Key="ContextMenu2">
<MenuItem Header="Command 2a"/>
<MenuItem Header="Command 2b"/>
</ContextMenu>
</UserControl.Resources>
<DockPanel>
<TreeView>
<TreeView.Resources>
<DataTemplate DataType="{x:Type Type1}">
<StackPanel ContextMenu="{StaticResource ContextMenu1"}/>
</DataTemplate>
<DataTemplate DataType="{x:Type Type2}">
<StackPanel ContextMenu="{StaticResource ContextMenu2"}/>
</DataTemplate>
</TreeView.Resources>
</TreeView>
</DockPanel>
</UserControl>
public class Type1 {
public void OnCommand1a() {}
public void OnCommand1b() {}
}
public class Type2 {
public void OnCommand2a() {}
public void OnCommand2b() {}
}
我需要做什么才能单击菜单上的相应项调用相应的功能
如果我加上:
Command="{Binding Path=OnCommand1a}" CommandTarget="{Binding Path=PlacementTarget}"
等等,然后在运行时,我得到关于OnCommand1a如何不是属性的错误。一些搜索表明这与常规事件有关,但我真的不明白这是怎么回事
如果我使用
Click="OnCommand1a"
然后在UserControl上查找OnCommand1a(),而不是在绑定到DataTemplate的类型上查找
处理这个问题的标准方法是什么 首先,您需要一个扩展ICommand的类。 您可以使用以下选项:
public class DelegateCommand : ICommand
{
private readonly Action<object> executeMethod = null;
private readonly Func<object, bool> canExecuteMethod = null;
public event EventHandler CanExecuteChanged
{
add { return; }
remove { return; }
}
public DelegateCommand(Action<object> executeMethod, Func<object, bool> canExecuteMethod)
{
this.executeMethod = executeMethod;
this.canExecuteMethod = canExecuteMethod;
}
public bool CanExecute(object parameter)
{
if (canExecuteMethod == null) return true;
return this.canExecuteMethod(parameter);
}
public void Execute(object parameter)
{
if (executeMethod == null) return;
this.executeMethod(parameter);
}
}
并在Type1构造函数中按以下方式设置它:
OnCommand1a = new DelegateCommand(c => Cmd1a(), null);
其中,Cmd1a是:
private void Cmd1a()
{
//your code here
}
最后,在xaml中:
Command="{Binding Path=OnCommand1a}"
,按照这些链接了解命令绑定并利用它。。。
Command="{Binding Path=OnCommand1a}"