c＃/ WPF在资源字典数据触发器中使用c＃变量

我正在使用一些带有模板内容的按钮c＃/ WPF在资源字典数据触发器中使用c＃变量

例如，

button.Template = (ControlTemplate)FindResource("StatusEmpty");

在隐藏文件相同的代码是一个名为currentNumber

private int currentNumber = 1; 
    public int CurrentNumber 
    { 
     get 
     { 
      return currentNumber; 
     } 
    }

（全局）字段这些模板是在合并RessourceDictionary定义

<ControlTemplate x:Key="BinStatusEmpty" TargetType="Button"> 
    <Border x:Name="border" BorderBrush="LightGray" CornerRadius="8,8,8,8" Margin="3" > 
     <Border.Background> 
      <LinearGradientBrush> 
       <GradientStop Offset="0" Color="white"></GradientStop> 
       <GradientStop Offset="1" Color="LightGray"></GradientStop> 
      </LinearGradientBrush> 
     </Border.Background> 
     <ContentPresenter Content = "{TemplateBinding Content}" 
      HorizontalAlignment = "Center" VerticalAlignment = "Center" 
          TextBlock.FontSize="40"/> 
    </Border> 
    <ControlTemplate.Triggers> 
     <Trigger Property="IsMouseOver" Value="True"> 
      <Setter Property="BorderBrush" Value="Blue" TargetName="border" /> 
      <Setter Property="BorderThickness" Value="4" TargetName="border" /> 
     </Trigger> 

     <DataTrigger Binding="{Binding currentNumber, RelativeSource={RelativeSource FindAncestor, AncestorType=Window}}" Value="{TemplateBinding Content}" > 
      <Setter Property="BorderBrush" Value="Blue" TargetName="border" /> 
      <Setter Property="BorderThickness" Value="4" TargetName="border" /> 
     </DataTrigger> 

    </ControlTemplate.Triggers> 
</ControlTemplate>

我要的是一个数据触发它根据当前的c＃变量改变模板动态中定义的边界。

目前有两个问题： 1）结合

{Binding currentNumber, RelativeSource={RelativeSource FindAncestor, AncestorType=Window}}

没有找到我的变量

BindingExpression path error: 'currentNumber' property not found on 'object' ''MainWindow' (Name='xMainWindow')'. BindingExpression:Path=currentNumber; DataItem='MainWindow' (Name='xMainWindow'); target element is 'BinButton' (Name=''); target property is 'NoTarget' (type 'Object')

2）我不能绑定

{TemplateBinding Content}

为数据触发器的值。

非常感谢

勒

来源

2017-05-18 Rene

你应该绑定到财产Ç urrentNumber（大写 'C'），而不是支持字段Ç urrentNumber。

但是，您不能将DataTrigger的Value属性绑定到某物。这是不支持：

Using binding for the Value property of DataTrigger condition

您需要使用转换器：

namespace WpfApplication1 
{ 
    public class MultiConverter : IMultiValueConverter 
    { 
     public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) 
     { 
      int CurrentNumber = (int)values[0]; 
      object content = values[1]; 

      return CurrentNumber.ToString() == content.ToString(); 
     } 

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

XAML：

<ControlTemplate x:Key="BinStatusEmpty" TargetType="Button" 
       xmlns:local="clr-namespace:WpfApplication1"> 
    <ControlTemplate.Resources> 
     <local:MultiConverter x:Key="conv" /> 
    </ControlTemplate.Resources> 
    <Border x:Name="border" BorderBrush="LightGray" CornerRadius="8,8,8,8" Margin="3" > 
     <Border.Background> 
      <LinearGradientBrush> 
       <GradientStop Offset="0" Color="white"></GradientStop> 
       <GradientStop Offset="1" Color="LightGray"></GradientStop> 
      </LinearGradientBrush> 
     </Border.Background> 
     <ContentPresenter Content = "{TemplateBinding Content}" 
            HorizontalAlignment = "Center" VerticalAlignment = "Center" 
           TextBlock.FontSize="40"/> 
    </Border> 
    <ControlTemplate.Triggers> 
     <Trigger Property="IsMouseOver" Value="True"> 
      <Setter Property="BorderBrush" Value="Blue" TargetName="border" /> 
      <Setter Property="BorderThickness" Value="4" TargetName="border" /> 
     </Trigger> 
     <DataTrigger Value="True"> 
      <DataTrigger.Binding> 
       <MultiBinding Converter="{StaticResource conv}"> 
        <Binding Path="CurrentNumber" RelativeSource="{RelativeSource FindAncestor, AncestorType=Window}" /> 
        <Binding Path="Content" RelativeSource="{RelativeSource Self}" /> 
       </MultiBinding> 
      </DataTrigger.Binding> 
      <Setter Property="BorderBrush" Value="Blue" TargetName="border" /> 
      <Setter Property="BorderThickness" Value="4" TargetName="border" /> 
     </DataTrigger> 
    </ControlTemplate.Triggers> 
</ControlTemplate>

来源

2017-05-18 10:16:23 mm8

它的工作静态情况下，但我怎么能当CurrentNumber的值发生变化时触发器是否被触发？谢谢 – Rene

@Rene：您需要实现INotifyPropertyChanged接口并在CurrentNumber属性设置为新值时引发PropertyChanged事件：https://msdn.microsoft.com/zh-cn/library/system.componentmodel.inotifypropertychanged （v = vs.110）.aspx – mm8

它的工作原理！非常感谢 – Rene

c＃/ WPF在资源字典数据触发器中使用c＃变量

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