WPF MenuItem：混合数据绑定项和静态内容 [英] WPF MenuItem : Mix databound items and static content

问题描述

我想建立一个具有以下结构的MRU菜单：

I'd like to build an MRU menu that has the following structure:

File
+=>Recent Files
   +=> Doc1.txt
   +=> Doc2.txt
   -separator-
   +=> Clear entries

这是MVVM，我的mru列表是数据绑定到视图模型。因为我想添加分隔符，我不想在分类列表中插入分隔符和清除输入操作，我目前正在为菜单使用itemscontrol容器，但是我有可怕的填充问题。你有没有任何解决方案可以让我添加 MenuItem 实例？

This being MVVM, my mru list is databound to the View Model. Because I want to add the separator, and I don't fancy inserting the separator and the clear entry action in the list of items, I'm currently using an itemscontrol container for my menu, but I've got horrible padding issues. Do you have any solution that would allow me to just add MenuItem instances ?

这是XAML：

<!-- MRU list -->
<MenuItem Header="_Recent Files" >

    <ItemsControl ItemsSource="{Binding MostRecentlyUsed.Entries,Mode=OneWay}">
        <ItemsControl.ItemTemplate>
            <DataTemplate>
                <MenuItem Header="{Binding ShortName}" ToolTip="{Binding FileName}" Command="{Binding OpenCommand}"/>
            </DataTemplate>
        </ItemsControl.ItemTemplate>
    </ItemsControl>
    <Separator />
    <MenuItem Header="_Clean Entries" Command="{Binding MostRecentlyUsed.CleanCommand}" />
</MenuItem>
<Separator />

Cheers，
Florian

Cheers, Florian

推荐答案

将ItemTemplate替换为ItemContainerStyle，如下所示：

Replace the DataTemplate with an ItemContainerStyle as follows:

<MenuItem Header="_Recent Files" ItemsSource="{Binding Commands,Mode=OneWay}">
  <MenuItem.ItemContainerStyle>
    <Style TargetType="{x:Type MenuItem}">
       <Setter Property="Header" Value="{Binding Path=ShortName}" />
       <Setter Property="ToolTip" Value="{Binding Path=FileName}" />
       <Setter Property="Command" Value="{Binding Path=OpenCommand}" />
       <Setter Property="CommandParameter" Value="{Binding Path=OpenParameter}" />
       <Style.Triggers>
         <DataTrigger Binding="{Binding Path=IsSeparator}" Value="true">
           <Setter Property="MenuItem.Template">
             <Setter.Value>
               <ControlTemplate TargetType="{x:Type MenuItem}">
                 <Separator Style="{DynamicResource {x:Static MenuItem.SeparatorStyleKey}}"/>
               </ControlTemplate>
             </Setter.Value>
           </Setter>
         </DataTrigger>
       </Style.Triggers>
     </Style>
   </MenuItem.ItemContainerStyle>
 </MenuItem>

这是我绑定到的代码与代码类似（但不同）的代码： p>

Here is the code I am binding to that is similar to your code (but different):

public class MainViewModel : ViewModelBase
{
  public MainViewModel()
  {
     GoCommand = new DelegateCommand<object>(OnGoCommand, CanGoCommand);
     LoadCommands();
  }

  private List<MyCommand> _commands = new List<MyCommand>();
  public List<MyCommand> Commands
  {
     get { return _commands; }
  }

  private void LoadCommands()
  {
     MyCommand c1 = new MyCommand { OpenCommand = GoCommand, OpenParameter = "1", ShortName = "Doc1", FileName = "Doc1.txt", IsSeparator = false };
     MyCommand c2 = new MyCommand { OpenCommand = GoCommand, OpenParameter = "2", ShortName = "Doc2", FileName = "Doc1.txt", IsSeparator = false };
     MyCommand c3 = new MyCommand { OpenCommand = GoCommand, OpenParameter = "4", ShortName = "", FileName = "", IsSeparator = true };
     MyCommand c4 = new MyCommand { OpenCommand = GoCommand, OpenParameter = "5", ShortName = "_Clean Entries", FileName = "Clean Entries", IsSeparator = false };
     _commands.Add(c1);
     _commands.Add(c2);
     _commands.Add(c3);
     _commands.Add(c4);
  }

  public ICommand GoCommand { get; private set; }
  private void OnGoCommand(object obj)
  {
  }

  private bool CanGoCommand(object obj)
  {
     return true;
  }
}


public class MyCommand
{
  public ICommand OpenCommand { get; set; }
  public string ShortName { get; set; }
  public string FileName { get; set; }
  public string OpenParameter { get; set; }
  public bool IsSeparator { get; set; }
}

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