wpf - 中继命令未在菜单项单击时触发

Question

我的观点

<Button.ContextMenu>
   <ContextMenu x:Name="Conn_Context_button" Style="{StaticResource LeftContextMenuStyle}">
     <MenuItem Style="{StaticResource LeftContextMenuItemStyle}" Header="{x:Static properties:ResourceWrapper.Dashboard_Connection_Delete}" Click="MenuItem_DeleteConnection_Click" />
     <MenuItem Style="{StaticResource LeftContextMenuItemStyle}" Header="{x:Static properties:ResourceWrapper.Dashboard_Connection_Refresh}" Command="{Binding MyViewModel.RefreshCommand}" />
    </ContextMenu>

MyViewModel.cs

 public RelayCommand RefreshCommand { get; set; }
  RefreshCommand = new RelayCommand(RefreshConnection);
    private void RefreshConnection(object sender)
    {
       //My Logic
    }

当我单击刷新菜单项时，这里 RefreshCommand 没有触发

Answer 1

作为一个很好的例子，看看这个situation .

这是从我当前的一个项目中截取的一段简单代码:

private void PrepareCommands()
{
    RefreshCommand = new RelayCommand(RefreshCommandMethod);
    AddConfigurationCommand = new RelayCommand(AddConfigurationCommandMethod, param => CanAddConfiguration);
    EditConfigurationCommand = new RelayCommand(EditConfigurationCommandMethod, param => CanEditConfiguration);
    RemoveConfigurationCommand = new RelayCommand(RemoveConfigurationCommandMethod, param => CanRemoveConfiguration);
}

命令在哪里

#region Commands

public ICommand AddConfigurationCommand { get; set; }
public ICommand EditConfigurationCommand { get; set; }
public ICommand RemoveConfigurationCommand { get; set; }
public ICommand RefreshCommand { get; set; }

#endregion

绑定(bind)是

<StackPanel Orientation="Horizontal" HorizontalAlignment="Right" DockPanel.Dock="Right">
    <Button Template="{StaticResource AddButton}" Command="{Binding AddConfigurationCommand}"  Margin="3,0" />
    <Button Template="{StaticResource EditButton}" Command="{Binding EditConfigurationCommand}" Margin="3,0" />
    <Button Template="{StaticResource DeleteButton}" Command="{Binding RemoveConfigurationCommand}" Margin="3,0" />
</StackPanel>

正如 Jan Walczak 上面所说，尝试使用 ICommand而不是 RelayCommand .如果您创建了自己的 RelayCommand ，不要忘记从 ICommand 继承.