如何在Silverlight中爲組單選按鈕設置數據綁定？

Question

Sliverlight提供了帶有GroupName的單選按鈕，可以將單選按鈕與多個選項中的一個選項一起分組。這就像：

<RadioButton GroupName="Option" Content="Option 1"></RadioButton> 
<RadioButton GroupName="Option" Content="Option 2"></RadioButton> 
<RadioButton GroupName="Option" Content="Option 3"></RadioButton> 

然後在VM中，我只有一個屬性此選項，說這是MyChoice

public int MyChoice {get; set;} 

那麼如何設置數據的UI和虛擬機之間的這種情況下綁定？

Answer 1

使用一個轉換器布爾變量轉換爲int ：

在Xaml上，asssuming選項映射到您的MyChoice屬性上的1,2,3 ：

<RadioButton GroupName="Option" Content="Option 1" 
       IsChecked="{Binding Path=MyChoice, Converter={StaticResource RadioButtonToIntConverter}, 
     ConverterParameter=1}"/> 
    <RadioButton GroupName="Option" Content="Option 2" 
       IsChecked="{Binding Path=MyChoice, Converter={StaticResource RadioButtonToIntConverter}, 
     ConverterParameter=2}"/> 
    <RadioButton GroupName="Option" Content="Option 3" 
       IsChecked="{Binding Path=MyChoice, Converter={StaticResource RadioButtonToIntConverter}, 
     ConverterParameter=3}"/> 

在轉換器，並指出，我沒有添加任何施法保護：

public class RadioButtonToIntConverter:IValueConverter 
{ 
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture) 
    { 
     var para = System.Convert.ToInt32(parameter); 
     var myChoice = System.Convert.ToInt32(value); 
     return para == myChoice; 
    } 

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) 
    { 
     var para = System.Convert.ToInt32(parameter); 
     var isChecked = System.Convert.ToBoolean(value); 
     return isChecked ? para : Binding.DoNothing; 
    } 
} 

而且你最好在你的ViewModel實現INotifyPropertyChanged的。

Answer 2

嗨，你必須創建一個bool類型的三個屬性並綁定到單選

<StackPanel> 
     <RadioButton GroupName="Option" Content="Option 1" IsChecked="{Binding MyChoice1}"></RadioButton> 
     <RadioButton GroupName="Option" Content="Option 2" IsChecked="{Binding MyChoice2}"></RadioButton> 
     <RadioButton GroupName="Option" Content="Option 3" IsChecked="{Binding MyChoice3}"></RadioButton> 
    </StackPanel> 

的器isChecked財產視圖模型

 public class ViewModel:INotifyPropertyChanged 
    { 
     bool myChoice1; 

     public bool MyChoice1 
     { 
      get { return myChoice1; } 
      set { 
       myChoice1 = value; 
       Notify("MyChoice1"); 
      } 
     } 
     bool myChoice2; 

     public bool MyChoice2 
     { 
      get { return myChoice2; } 
      set 
      { 
       myChoice2 = value; 
       Notify("MyChoice2"); 
      } 
     } 
     bool myChoice3; 

     public bool MyChoice3 
     { 
      get { return myChoice3; } 
      set 
      { 
       myChoice3 = value; 
       Notify("MyChoice3"); 
      } 
     } 

     public void Notify(string propName) 
     { 
      if (PropertyChanged != null) 
       PropertyChanged(this, new PropertyChangedEventArgs(propName)); 

     } 
     public event PropertyChangedEventHandler PropertyChanged; 
    }