WPF組合框的SelectedItem綁定不工作

Question

我有以下的組合框是得到populat由枚舉型：

<ComboBox Name="cmbProductStatus" ItemsSource="{Binding Source={StaticResource statuses}}" 
                SelectedItem="{Binding Path=Status}" /> 

請注意，DataContext獲取的設置代碼隱藏。

它甚至不是雙向綁定，我有一些Product.Status的默認值，但它永遠不會被選中。

更新

有人問我，把我的狀態屬性的代碼。

public class Product { 
    //some other propertties 
    private ProductStatus _status = ProductStatus.NotYetShipped; 
    public ProductStatus Status { get { return _status; } set { value = _status; } } 
} 

public enum ProductStatus { NotYetShipped, Shipped }; 

Answer 1

您的狀態屬性必須通知其更改，並且您的產品類必須實現INotifyPropertyChanged接口。

在這裏，你必須具有該屬性;-)

/// <summary> 
     /// The <see cref="MyProperty" /> property's name. 
     /// </summary> 
     public const string MyPropertyPropertyName = "MyProperty"; 

     private bool _myProperty = false; 

     /// <summary> 
     /// Gets the MyProperty property. 
     /// TODO Update documentation: 
     /// Changes to that property's value raise the PropertyChanged event. 
     /// This property's value is broadcasted by the Messenger's default instance when it changes. 
     /// </summary> 
     public bool MyProperty 
     { 
      get 
      { 
       return _myProperty; 
      } 

      set 
      { 
       if (_myProperty == value) 
       { 
        return; 
       } 

       var oldValue = _myProperty; 
       _myProperty = value; 

       // Remove one of the two calls below 
       throw new NotImplementedException(); 

       // Update bindings, no broadcast 
       RaisePropertyChanged(MyPropertyPropertyName); 

       // Update bindings and broadcast change using GalaSoft.MvvmLight.Messenging 
       RaisePropertyChanged(MyPropertyPropertyName, oldValue, value, true); 
      } 
     } 

Answer 2

ComboBox綁定有點棘手。確保在分配DataContext時加載itemssource，並且使用SelectedItem分配的項目與ItemsSource中的一個項目符合==關係。