绑定到ViewModel的子类属性 [英] Binding to a ViewModel's Child Class Properties

问题描述

我正在努力将我视图中的StatusBarItem内容元素绑定到ViewModel中的子类属性，我正在使用MVVM-Light框架/

I'm struggling to be able to bind a StatusBarItem content element in my view to a subclasses property in my ViewModel, I'm using the MVVM-Light framework/

ViewModel：

ViewModel:

public class PageMainViewModel : ViewModelBase
{
    LoggedOnUserInfo UserInfo;

    public LoggedOnUser UserInfo
    {
       set
       {
          _UserInfo = value;
          RaisePropertyChanged("UserInfo");
       }
    }
}

为了完整清楚LoggedOnUser类定义如下

For full clarity the LoggedOnUser Class is defined as follows

public class LoggedOnUser : INotifyPropertyChanged
{
    private string _Initials;        

    public event PropertyChangedEventHandler PropertyChanged;            

    public LoggedOnUser()
    {

    }

    [DataMember]
    public string Initials
    {
        get { return _Initials; }
        set 
        { 
             _Initials = value;
            OnPropertyChanged("Initials");
        }
    }

    protected void OnPropertyChanged(string propValue)
    {
        PropertyChangedEventHandler handler = PropertyChanged;
        if (handler != null)
        {
            handler(this, new PropertyChangedEventArgs(propValue));
        }
    }

}

我的意见DataContext正在设置，并且正在工作，因为我可以看到其他绑定工作，但我尝试绑定到我的XAML中的UserInfo.Initials属性正在产生一个空的结果。

My Views DataContext is being set and is working as I am able to see other bindings working, but my attempts to bind to UserInfo.Initials property in my XAML are producing an empty result.

XAML：

<StatusBarItem Grid.Column="0" Content="{Binding UserInfo.Initials}" Margin="5,0,0,0" VerticalAlignment="Center" Focusable="False" />

UserInfo属性是在viewModel创建之后设置的，因为有几个因素，但我认为我的propertychanged事件这将是可以的。

The UserInfo property is set after the viewModel is created due to several factors but I thought with my propertychanged events this would be ok.

对此的任何建议将不胜感激。

Any Advice on this would be greatly appreciated.

推荐答案

在 UserInfo 中似乎没有吸引者，绑定将不幸。

You do not appear to have a getter on UserInfo, the binding will be out of luck.

（另外检查绑定错误当遇到麻烦的绑定，他们可能会告诉你所有他们的问题）

(Also check for binding errors when having trouble with bindings, they probably will tell you about all their problems)

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