列表视图中的多重绑定 [英] Multibinding within a list view

问题描述

我有一个包含几列的ListView.我将每个GridViewColumn绑定到一个属性都没有问题，例如:

I have a ListView that has a few columns. I have no problem binding each GridViewColumn to a property, For example:

<ListView ItemsSource="{Binding MyList}">
    <ListView.View>
        <GridView>
            <GridViewColumn DisplayMemberBinding="{Binding Name}">
                <GridViewColumnHeader Content="Name"/>
            </GridViewColumn>
        </GridView>
   </ListView.View>
</ListView>

当我尝试将GridViewColumn多绑定到两个属性时，问题开始了:

The problems start when I try to multibind a GridViewColumn to two properties:

<GridViewColumn>
    <GridViewColumn.DisplayMemberBinding>
        <MultiBinding Converter="{StaticResource DisplayMemberConverter}">
            <Binding Path="HighestScore"/>
            <Binding Path="IsHighestScoreApplicable"/>
        </MultiBinding>
   </GridViewColumn.DisplayMemberBinding>
   <GridViewColumnHeader Content"Highest_Score"/>

我使用的转换器在这里给出:

The converter I use is given here:

public class DisplayMemberConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {            
        int int_value = (int)values[0];
        bool bool_value = (bool)values[1];

        if (bool_value == true)
            return int_value;

        return null;
    }

   ...    
}

我想实现以下效果:'IsHighestScoreApplicable'属性为false时-列表视图中没有显示任何内容(空)，为true时-显示了HighestScore值，但没有用-所有我即使"IsHighestScoreApplicable"为true，get也是一个空列.此外，当我调试Convert()方法时，我可以看到if语句:

I want to achieve the effect that when 'IsHighestScoreApplicable' property is false - nothing is shown on the list view (empty), and when it's true - the HighestScore value is shown, but that doesn't work out - all I get is an empty column even when ''IsHighestScoreApplicable' is true. Furthermore, when I debug Convert() method I can see that the if statement:

 if (bool_value == true)

保持不变，返回的值是int_value，但列表视图上仍然没有任何显示.

holds, and the returned value is int_value , but still nothing shows up on the List View.

怎么了?

万事如意，戴夫

推荐答案

几分钟前，我需要在列表视图中进行多重绑定.

A couple minutes ago i needed multibinding in a listview.

我是怎么做到的:

我为该单元创建了一个数据模板.数据模板包含一个文本块，我们在该文本块上进行多重绑定.

I made a datatemplate for the cell. The datatemplate contains an textblock, on that textblock we doing multibinding.

<ListView Margin="33,0,0,0" ItemsSource="{Binding HourRegistry}">
        <ListView.View>
            <GridView>
                <GridViewColumn Width="200" Header="Worker" >
                    <GridViewColumn.CellTemplate>
                        <DataTemplate>
                            <TextBlock>
                                <TextBlock.Text>
                                    <MultiBinding StringFormat="{}{0} {1}">
                                        <Binding Path="Employee.FirstName" />
                                        <Binding Path="Employee.Name" />
                                    </MultiBinding>
                                </TextBlock.Text>
                            </TextBlock>
                        </DataTemplate>
                    </GridViewColumn.CellTemplate>
                </GridViewColumn>
                <GridViewColumn Width="100" Header="Job"  DisplayMemberBinding="{Binding Path=Keycode}"/>
            </GridView>
        </ListView.View>

也许晚了，但对其他人来说很方便

Maybe late but handy for other people

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