带菜单的 WPF Caliburn 微型导体

Question

我目前正在使用 Caliburn Micro 2.0.2 尝试使用 ShellView 顶部的菜单进行 Conductor 导航。 MenuItem 的第一级工作正常，但第二级抛出 "No target found for method Select." 异常。

ShellView代码：

<Grid  xmlns:cal="http://www.caliburnproject.org"
    xmlns:cal2="clr-namespace:Caliburn.Micro;assembly=Caliburn.Micro">
    <Grid.RowDefinitions>
      <RowDefinition Height="Auto"/>
      <RowDefinition Height="*"/>
    </Grid.RowDefinitions>
    <Menu VerticalAlignment="Top" ItemsSource="{Binding Items}">
      <Menu.Resources>
        <Style TargetType="MenuItem">
          <Setter Property="cal:Message.Attach" 
                  Value="[Event Click] = [Action Select($DataContext)]" />
          <Setter Property="cal:Action.TargetWithoutContext" 
                  Value="{Binding DataContext, RelativeSource={RelativeSource Self}}}"/>
        </Style>
        <HierarchicalDataTemplate ItemsSource="{Binding Items}" 
                                   DataType="{x:Type cal2:Screen}">
          <TextBlock Text="{Binding DisplayName}"/>
         </HierarchicalDataTemplate>
      </Menu.Resources>
    </Menu>
    <ContentControl Grid.Row="1" cal:View.Model="{Binding ActiveItem}"/>
  </Grid>

ShellViewModel 代码：

public class ShellViewModel : Conductor<IScreen>.Collection.OneActive
{
  public ShellViewModel(IEnumerable<IScreen> viewmodels)
  {
  //omitted for brevity. 
  }
  public void Select(object datacontext)
  {
      var vm = datacontext as IScreen;
      if (vm != null && Items.Contains(vm))
      {
        ActivateItem(vm);
      }
   }
 }

具有更多视图模型的内部 Conductor 具有与相应接口类型相同的 select 方法。我不知道如何让事件进行连接。请帮忙

Answer 1

我成功了。绑定到 RelativeSource Self 是问题所在。我现在可以按名称绑定到元素。这也让我在 shell.

上只有一个方法

ShellView代码：

<Grid  xmlns:cal="http://www.caliburnproject.org"
    xmlns:cal2="clr-namespace:Caliburn.Micro;assembly=Caliburn.Micro">
    <Grid.RowDefinitions>
      <RowDefinition Height="Auto"/>
      <RowDefinition Height="*"/>
    </Grid.RowDefinitions>
    <Menu x:Name="menu" VerticalAlignment="Top" ItemsSource="{Binding Items}">
  <Menu.Resources>
    <Style TargetType="MenuItem">
      <Setter Property="cal:Message.Attach" 
              Value="[Event Click] = [Action Select($DataContext)]" />
      <Setter Property="cal:Action.TargetWithoutContext" 
              Value="{Binding DataContext, ElementName=menu}"/>
    </Style>
    <HierarchicalDataTemplate ItemsSource="{Binding Items}" 
                               DataType="{x:Type cal2:Screen}">
      <TextBlock Text="{Binding DisplayName}"/>
    </HierarchicalDataTemplate>
  </Menu.Resources>
 </Menu>        
 <ContentControl Grid.Row="1" cal:View.Model="{Binding ActiveItem}"/>
</Grid>

ShellViewModel 代码：

public class ShellViewModel : Conductor<IScreen>.Collection.OneActive
{
  public ShellViewModel(IEnumerable<IScreen> viewmodels)
  {
  //omitted for brevity. 
  }
  public void Select(object datacontext)
  {
      var vm = datacontext as IScreen;
      if (vm != null && Items.Contains(vm))
      {
         if (vm.IsActive)
           return;
         ActivateItem(vm);
         vm.Refresh();
      }
      else
      {
         var vm2 = datacontext as Screen;
         if (vm2 != null)
         {
           (vm2.Parent as IConductActiveItem)?.ActivateItem(vm2);
            vm2.Refresh();
         }
      }
   }       
 }

带菜单的 WPF Caliburn 微型导体

WPF Caliburn Micro Conductors with Menu

c#

wpf

menuitem

caliburn.micro