多重绑定生成“由于必须指定MultiValueConverter，因此无法设置MultiBinding". [英] Multibinding generates "Cannot set MultiBinding because MultiValueConverter must be specified"

问题描述

我有一个带有绑定功能的按钮，可以正常工作，请参见下文:

I have a button with binding which works fine, see below:

<Button x:Name="licenceFilterSet" Content="Search" Command="{Binding searchCommand}" CommandParameter="{Binding Path=Text, ElementName=licenseTextBox}" />

现在，我意识到我还需要另一条信息，因此我也需要发送check-box的值. 我这样修改了虚拟机:

Now I have realized that I need yet another piece of information, so I need to send the value of a check-box as well. I modified the VM like this:

<Button x:Name="licenceFilterSet" Content="Search" Command="{Binding licenseSearchCommand}">
    <Button.CommandParameter>
        <MultiBinding Converter="{StaticResource searchFilterConverter}">
            <Binding Path="Text" ElementName="licenseTextBox" />
            <Binding Path="IsEnabled" ElementName="regularExpressionCheckBox" />
        </MultiBinding>
    </Button.CommandParameter>
</Button>

下面是我的多功能转换器:

Below is my multi-converter:

/// <summary>
/// Converter Used for combining license search textbox and checkbox
/// </summary>
public class SearchFilterConverter : IMultiValueConverter
{
    public object Convert(object[] values)
    {
        return new Tuple<String, bool>((String)values[0], (bool)values[1]);
    }
}

我在做什么错.我收到以下错误，(它指向XAML中的MultiBinding-tag):

What am I doing wrong. I am getting the following error, (which is pointing to my MultiBinding-tag in XAML):

Cannot set MultiBinding because MultiValueConverter must be specified.

推荐答案

您必须实现IMultiConverter

you have to implement IMultiConverter

public class SearchFilterConverter : IMultiValueConverter
{
 public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
 {
    return new Tuple<String, bool>((String)values[0], (bool)values[1]);;
 }
 public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

然后在xaml中创建资源

then create the resource in xaml

 <Converter:SearchFilterConverter x:Key="searchFilterConverter" />

然后它应该工作

<Button x:Name="licenceFilterSet" Content="Search" Command="{Binding licenseSearchCommand}">
<Button.CommandParameter>
    <MultiBinding Converter="{StaticResource searchFilterConverter}">
        <Binding Path="Text" ElementName="licenseTextBox" />
        <Binding Path="IsEnabled" ElementName="regularExpressionCheckBox" />
    </MultiBinding>
</Button.CommandParameter>
</Button>

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