Question

所以，我有一个模型

public class MyModel
    {
        public string Id { get; }
        public string Representation { get; }
        public static IEnumerable<MyModel> MyModels() { ... }
    }

使用MyModels作为ItemSource的组合框，其中MyModel.Representation定义为显示的属性

<ObjectDataProvider x:Key="myModelsData" 
                    ObjectType="{x:Type models:MyModel}" 
                    MethodName="MyModels"/>

<ComboBox Name="MyBox" 
          ItemsSource="{Binding Source={StaticResource myModelsData}}" 
          DisplayMemberPath="Representation"/>

现在，我正在进行多绑定，我想引用的不是MyModel.Representation，而是指MyModel.Id。怎么做？

我现在知道的唯一方法是

<Button Command="{Binding MyCommand}">
    <Button.CommandParameter>
        <MultiBinding Converter="{StaticResource myModelConverter }">
            <Binding ElementName="MyBox" Path="Text"/>
        </MultiBinding>
    </Button.CommandParameter>
</Button>

但Text包含MyModel.representation。那么，怎么样？

<Binding Path={MyBox.SelectedItem.Id}/>

Answer 1

假设您有ViewModel，那么您可以将ComboBox.SelectedItem绑定到某个媒体资源，然后从那里访问您的Model。

class ViewModel
{
    public MyModel SelectedModel { get; set; }
    public ICommand MyCommand => new DelegateCommand(MyCommandMethod);
    public void MyCommandMethod()
    {
        string representation = SelectedModel.Representation;
    }
}

然后在你的View ..

<ComboBox Name="MyBox"
          ItemsSource="{Binding Source={StaticResource myModelsData}}"
          DisplayMemberPath="Representation"
          SelectedItem="{Binding SelectedModel}"/>
<Button Command="{Binding MyCommand}" />

C＃WPF如何在MultiBinding

1 个答案: