如何从ViewModel访问视图属性？

Question

我有一个ViewModel，其属性是从View（XAML文件）绑定的。 我在代码隐藏文件中也有一个属性“StaticText”。

如何从ViewModel内部访问“StaticText”属性？

根据Cameron的建议，我在我的视图中创建了一个依赖属性：

    String textToTest="I am just testing .";

     public string TextToTest
     {
         get { return (string)this.GetValue(TextToTestProperty); }
         set { this.SetValue(TextToTestProperty, value); }
     }
     public static readonly DependencyProperty TextToTestProperty =
         DependencyProperty.Register("TextToTest", typeof(string),
         typeof(MainWindow), new PropertyMetadata(false));

我已将此添加到构造函数中：

         Binding aBinding = new Binding();
         aBinding.Path = new PropertyPath("TextToTest");
         aBinding.Source = viewModel;
         aBinding.Mode = BindingMode.TwoWay;
         this.SetBinding(TextToTestProperty, aBinding);

但是当我运行代码时出现异常。

Answer 1

通过使属性为Dependency Property，您可以将View中的属性绑定到ViewModel中的属性。

public string TextToTest
{
    get { return (string)this.GetValue(TextToTestProperty); }
    set { this.SetValue(TextToTestProperty, value); } 
}
public static readonly DependencyProperty TextToTestProperty = 
    DependencyProperty.Register("TextToTest", typeof(string), 
    typeof(MyControl), new PropertyMetadata(""));

请参阅How to: Implement a Dependency Property