c# - 绑定(bind)到内部 ViewModel-Property

Question

我有一个带有 ViewModel 类作为 DataContext 的 UserControl:

XAML

<UserControl x:Class="DotfuscatorTest.UserControl.View.UserControlView"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
         mc:Ignorable="d" >    
<StackPanel>
  <TextBox Text="{Binding ViewModelProperty}"/>
</StackPanel>
</UserControl>

代码隐藏:

namespace DotfuscatorTest.UserControl.View
{
   using ViewModel;
   public partial class UserControlView
   {
      public UserControlView()
      {
         InitializeComponent();
         DataContext = new UserControlViewModel();         
      }
   }
}

View 模型类:

namespace DotfuscatorTest.UserControl.ViewModel
{
   public class UserControlViewModel
   {
      private string viewModelProperty = "hello world";

      internal string ViewModelProperty
      {
        get { return viewModelProperty; }
        set { viewModelProperty = value; }
      }
   }
}

如果我将 ViewModelProperty 设置为 public，则绑定(bind)工作正常。但是，如果我像上面那样将属性设置为内部，则绑定(bind)失败(绑定(bind)错误:找不到属性...)。

我认为内部属性在同一个程序集中可以像公共(public)一样访问。我也可以毫无问题地从 UserControl-codebehind 访问该属性:

{
...

((UserControlViewModel)DataContext).ViewModelProperty = "hallo viewmodel";

...

对这种行为有什么解释吗？

提前致谢，rhe1980

Answer 1

如前所述here

The properties you use as binding source properties for a binding must be public properties of your class. Explicitly defined interface properties cannot be accessed for binding purposes, nor can protected, private, internal, or virtual properties that have no base implementation.