更改XAML中的绑定值 [英] Change Binding value in XAML

问题描述

我需要在XAML中做一些复杂的绑定。我有一个 DependencyProperty typeof（double）;让我们命名为 SomeProperty 。在我控制的XAML代码的某处，我需要使用整个 SomeProperty 值，只有一半，某处 SomeProperty / 3 等等。

我该怎么做，如：

 < SomeControl Value ={Binding ElementName = MyControl，Path = SomeProperty} / 3/> 
  

：）

展望未来

解决方案

使用除法 ValueConverter ：

  public class DivisionConverter：IValueConverter 
 {
 public object Convert（object value，Type targetType，object parameter，System.Globalization.CultureInfo culture）
 {
 int divideBy = int.Parse（参数为string）; 
 double input =（double）value; 
 return input / divideBy; 
 
 
 public object ConvertBack（object value，Type targetType，object parameter，System.Globalization.CultureInfo culture）
 {
 throw new NotSupportedException（）; 
} 
} 
  

 <！ - 创建为资源 - > 
< local：DivisionConverter x：Key =DivisionConverter/> 
 
<！ - 用法示例 - > 
< TextBlock Text ={Binding SomeProperty，Converter = {StaticResource DivisionConverter}，ConverterParameter = 1}/> 
< TextBlock Text ={Binding SomeProperty，Converter = {StaticResource DivisionConverter}，ConverterParameter = 2}/> 
< TextBlock Text ={Binding SomeProperty，Converter = {StaticResource DivisionConverter}，ConverterParameter = 3}/> 
  

I need to make some complex binding in XAML. I have a DependencyProperty typeof(double); let's name it SomeProperty. Somewhere in XAML code of my control, I need to use the whole SomeProperty value, somewhere only a half, somewhere SomeProperty/3, and so on.

How can I do something like:

<SomeControl Value="{Binding ElementName=MyControl, Path=SomeProperty} / 3"/>

:)

Looking forward.

解决方案

Use a division ValueConverter:

public class DivisionConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        int divideBy = int.Parse(parameter as string);
        double input = (double)value;
        return input / divideBy;
    }

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

<!-- Created as resource -->
<local:DivisionConverter x:Key="DivisionConverter"/>

<!-- Usage Example -->
<TextBlock Text="{Binding SomeProperty, Converter={StaticResource DivisionConverter}, ConverterParameter=1}"/>
<TextBlock Text="{Binding SomeProperty, Converter={StaticResource DivisionConverter}, ConverterParameter=2}"/>
<TextBlock Text="{Binding SomeProperty, Converter={StaticResource DivisionConverter}, ConverterParameter=3}"/>

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