|ZYCWPF| i:Interaction.Triggers 中的 DataTrigger 如何写组进行验证，我找不到MultDataTrigger这个方法

[javamy019]

    <Button x:Name="btnLogin">
         <i:Interaction.Triggers>
             <ei:DataTrigger Binding="{Binding ElementName=chkTypeServer,Path=IsChecked}" Comparison="Equal" Value="True">
                 <ei:ChangePropertyAction PropertyName="IsEnabled" Value="True"></ei:ChangePropertyAction>
             </ei:DataTrigger>
             <ei:DataTrigger Binding="{Binding ElementName=chkTypeClient,Path=IsChecked}" Comparison="Equal" Value="True">
                 <ei:ChangePropertyAction PropertyName="IsEnabled" Value="True"></ei:ChangePropertyAction>
             </ei:DataTrigger>
         </i:Interaction.Triggers>
         连接
     </Button>

但我现在只能实现

 if(chkTypeServer.IsChecked = true)
  {
      btnLogin.IsEnabled = true;
  }
  if(chkTypeClient.IsChecked = true)
  {
      btnLogin.IsEnabled = true;
  }
  

如上，我想实现

if(chkTypeServer.IsChecked = true || chkTypeClient.IsChecked = true)
{
    btnLogin.IsEnabled = true;
}
else
{
    btnLogin.IsEnabled = false;
}

那这个DataTrigger应该怎么写呢？

万分感谢

[jshi123]

因为在xaml中不能写else，所以逻辑应该是这样：

	if (chkTypeServer.IsChecked == true || chkTypeClient.IsChecked == true)
	{
		btnLogin.IsEnabled = true;
	}
	if (chkTypeServer.IsChecked == false && chkTypeClient.IsChecked == false)
	{
		btnLogin.IsEnabled = false;
	}

xmal：

    <Window.Resources>
        <ei:ConditionBehavior x:Key="ServerOrClientChecked" x:Shared="False">
            <ei:ConditionalExpression ForwardChaining="Or">
                <ei:ComparisonCondition LeftOperand="{Binding IsChecked, ElementName=chkTypeServer}"
                                                        Operator="Equal" 
                                                        RightOperand="True"/>
                <ei:ComparisonCondition LeftOperand="{Binding IsChecked, ElementName=chkTypeClient}"
                                                        Operator="Equal" 
                                                        RightOperand="True"/>
            </ei:ConditionalExpression>
        </ei:ConditionBehavior>
        <ei:ConditionBehavior x:Key="ServerAndClientNotChecked" x:Shared="False">
            <ei:ConditionalExpression ForwardChaining="And">
                <ei:ComparisonCondition LeftOperand="{Binding IsChecked, ElementName=chkTypeServer}"
                                                        Operator="Equal" 
                                                        RightOperand="False"/>
                <ei:ComparisonCondition LeftOperand="{Binding IsChecked, ElementName=chkTypeClient}"
                                                        Operator="Equal" 
                                                        RightOperand="False"/>
            </ei:ConditionalExpression>
        </ei:ConditionBehavior>
    </Window.Resources>
    <StackPanel>
        <CheckBox Name="chkTypeServer">Server</CheckBox>
        <CheckBox Name="chkTypeClient">Client</CheckBox>
        <Button x:Name="btnLogin">
            <i:Interaction.Triggers>
                
                <ei:PropertyChangedTrigger Binding="{Binding IsChecked, ElementName=chkTypeServer}">
                    <i:Interaction.Behaviors><StaticResource ResourceKey="ServerOrClientChecked" /></i:Interaction.Behaviors>
                    <ei:ChangePropertyAction PropertyName="IsEnabled" Value="True" />
                </ei:PropertyChangedTrigger>
                <ei:PropertyChangedTrigger Binding="{Binding IsChecked, ElementName=chkTypeClient}">
                    <i:Interaction.Behaviors><StaticResource ResourceKey="ServerOrClientChecked" /></i:Interaction.Behaviors>
                    <ei:ChangePropertyAction PropertyName="IsEnabled" Value="True" />
                </ei:PropertyChangedTrigger>

                <ei:PropertyChangedTrigger Binding="{Binding IsChecked, ElementName=chkTypeServer}">
                    <i:Interaction.Behaviors><StaticResource ResourceKey="ServerAndClientNotChecked" /></i:Interaction.Behaviors>
                    <ei:ChangePropertyAction PropertyName="IsEnabled" Value="False" />
                </ei:PropertyChangedTrigger>
                <ei:PropertyChangedTrigger Binding="{Binding IsChecked, ElementName=chkTypeClient}">
                    <i:Interaction.Behaviors><StaticResource ResourceKey="ServerAndClientNotChecked" /></i:Interaction.Behaviors>
                    <ei:ChangePropertyAction PropertyName="IsEnabled" Value="False" />
                </ei:PropertyChangedTrigger>

            </i:Interaction.Triggers>
            连接
        </Button>
    </StackPanel>

[jshi123]

你这个需求有简单的实现方法，用多重绑定：

    <CheckBox Name="chkTypeServer">Server</CheckBox>
    <CheckBox Name="chkTypeClient">Client</CheckBox>
    <Button x:Name="btnLogin">
        <Button.Resources>
            <local:OrConverter x:Key="Or" />
        </Button.Resources>
        <Button.IsEnabled>
            <MultiBinding Converter="{StaticResource Or}">
                <Binding ElementName="chkTypeServer" Path="IsChecked" />
                <Binding ElementName="chkTypeClient" Path="IsChecked" />
            </MultiBinding>
        </Button.IsEnabled>
        连接
    </Button>

后台写个多个条件的合并转化类：

	public class OrConverter : IMultiValueConverter
	{
		public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
		{
			return values.OfType<bool>().Any(x => x);
		}

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

[javamy019]

你好。我的XAML里面怎么没有
<MultiBinding >
这个标记呢？
谢谢

[jshi123]

MultiBinding是xaml标准的啊，怎么会没有？
http://msdn.microsoft.com/zh-cn/library/system.windows.data.multibinding(v=vs.90).aspx

[javamy020]

不好意思。。。刚是没有，重新打开页面后就有了，晕死