使用多個綁定的C＃WPF IsEnabled？

Question

我有一個描述GUI部分的WPF xaml文件，我希望特定控件的啓用/禁用依賴於其他兩個文件。該代碼看起來是這樣的時刻：

<ComboBox Name="MyComboBox" 
      IsEnabled="{Binding ElementName=SomeCheckBox, Path=IsChecked}"/> 

但我想它是依賴於另一複選框，以及所以像：

<ComboBox Name="MyComboBox" 
      IsEnabled="{Binding ElementName=SomeCheckBox&AnotherCheckbox, Path=IsChecked}"/> 

什麼是去的最佳途徑？我不禁感到我錯過了明顯的東西，或者以錯誤的方式去做這件事？

Answer 1

我相信你可能必須使用一個MultiBinding與MultiValueConverter。在這裏看到：http://www.developingfor.net/wpf/multibinding-in-wpf.html

這裏是一個直接關係例如：http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/5b9cd042-cacb-4aaa-9e17-2d615c44ee22

Answer 2

您可以使用MultiBinding與實現IMultiValueConverter的轉換器。

只給一個答案，你可以（幾乎）複製&貼：

所需的靜態資源：

<converterNamespace:BooleanAndConverter x:Key="booleanAndConverter" /> 

組合框：

<ComboBox Name="MyComboBox"> 
    <ComboBox.IsEnabled> 
    <MultiBinding Converter="{StaticResource booleanAndConverter}"> 
     <Binding ElementName="SomeCheckBox" Path="IsChecked" /> 
     <Binding ElementName="AnotherCheckbox" Path="IsChecked" /> 
    </MultiBinding> 
    </ComboBox.IsEnabled> 
</ComboBox> 

該轉換器的代碼：

namespace ConverterNamespace 
{ 
    public class BooleanAndConverter : IMultiValueConverter 
    { 
     public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture) 
     { 
      foreach (object value in values) 
      { 
       if ((value is bool) && (bool)value == false) 
       { 
        return false; 
       } 
      } 
      return true; 
     } 
     public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture) 
     { 
      throw new NotSupportedException("BooleanAndConverter is a OneWay converter."); 
     } 
    } 
} 

Answer 3

您也可以嘗試同樣的短版：

public class BooleanAndConverter : IMultiValueConverter 
{ 
    public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture) 
    { 
     return values.OfType<IConvertible>().All(System.Convert.ToBoolean); 
    } 

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture) 
    { 
     throw new NotSupportedException(); 
    } 
} 

public class BooleanOrConverter : IMultiValueConverter 
{ 
    public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture) 
    { 
     return values.OfType<IConvertible>().Any(System.Convert.ToBoolean); 
    } 

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture) 
    { 
     throw new NotSupportedException(); 
    } 
} 

，當然，你可能需要知名度的轉換器，太：

public class BooleanOrToVisibilityConverter : IMultiValueConverter 
{ 
    public Visibility HiddenVisibility { get; set; } 

    public bool IsInverted { get; set; } 

    public BooleanOrToVisibilityConverter() 
    { 
     HiddenVisibility = Visibility.Collapsed; 
     IsInverted = false; 
    } 

    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) 
    { 
     bool flag = values.OfType<IConvertible>().Any(System.Convert.ToBoolean); 
     if (IsInverted) flag = !flag; 
     return flag ? Visibility.Visible : HiddenVisibility; 
    } 

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) 
    { 
     throw new NotImplementedException(); 
    } 
} 

public class BooleanAndToVisibilityConverter : IMultiValueConverter 
{ 
    public Visibility HiddenVisibility { get; set; } 

    public bool IsInverted { get; set; } 

    public BooleanAndToVisibilityConverter() 
    { 
     HiddenVisibility = Visibility.Collapsed; 
     IsInverted = false; 
    } 

    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) 
    { 
     bool flag = values.OfType<IConvertible>().All(System.Convert.ToBoolean); 
     if (IsInverted) flag = !flag; 
     return flag ? Visibility.Visible : HiddenVisibility; 
    } 

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) 
    { 
     throw new NotImplementedException(); 
    } 
}