wpf 绑定到内部 ViewModel-Property
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Binding to internal ViewModel-Property
提问by rhe1980
I have a UserControl with a ViewModel class as DataContext:
我有一个带有 ViewModel 类的 UserControl 作为 DataContext：
XAML
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>
CodeBehind:
代码隐藏：
namespace DotfuscatorTest.UserControl.View
{
using ViewModel;
public partial class UserControlView
{
public UserControlView()
{
InitializeComponent();
DataContext = new UserControlViewModel();
}
}
}
ViewModel class:
视图模型类：
namespace DotfuscatorTest.UserControl.ViewModel
{
public class UserControlViewModel
{
private string viewModelProperty = "hello world";
internal string ViewModelProperty
{
get { return viewModelProperty; }
set { viewModelProperty = value; }
}
}
}
If I set the ViewModelProperty to public the binding works fine. But if I set the property to internal like above the binding fails (Binding error: property not found... ).
如果我将 ViewModelProperty 设置为 public，则绑定工作正常。但是，如果我将属性设置为内部，则绑定失败（绑定错误：未找到属性...）。
I thought an internal property is accessible like public in same assembly. Also I can access to the property from UserControl-codebehind without any problem:
我认为在同一个程序集中可以像 public 一样访问内部属性。我也可以毫无问题地从 UserControl-codebehind 访问该属性：
{
...
((UserControlViewModel)DataContext).ViewModelProperty = "hallo viewmodel";
...
Any explenation for this behavior?
这种行为的任何解释？
Thanks in advance, rhe1980
提前致谢，rhe1980
回答by JleruOHeP
As stated here
如前所述这里
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.
您用作绑定的绑定源属性的属性必须是您的类的公共属性。不能出于绑定目的访问显式定义的接口属性，也不能访问没有基本实现的受保护、私有、内部或虚拟属性。
