获取列表框行对象从一个按钮，是对的DataTemplate [英] Get the ListBox row object from a button that is on the DataTemplate

问题描述

我有一个列表框与的DataTemplate 。该模板有一个按钮就可以了。当按钮点击我想要做一些逻辑与的每一行（在这种情况下，所谓的对象 WorkItemTypeMappings ）。

在的OnClick 我怎么能去从按钮（对象发件人）来表示是排的按钮上？对象

这里是我的XAML 列表框：

 ＆LT;列表框的ItemsSource ={绑定源= {的StaticResource WorkItemTypeMappingsCollectionView}}Horizo​​ntalContentAlignment =拉伸ScrollViewer.Horizo​​ntalScrollBarVisibility =已禁用NAME =lstWITypes＆GT;
    ＆LT; ListBox.GroupStyle＆GT;
        ＆LT; X：静态成员=GroupStyle.Default/＆GT;
    ＆LT; /ListBox.GroupStyle>
    ＆LT; ListBox.ItemTemplate＆GT;
        ＆LT;的DataTemplate＆GT;
            ＆LT;网格的Horizo​​ntalAlignment =拉伸＆GT;
                ＆LT; Grid.ColumnDefinitions＆GT;
                    ＆LT; ColumnDefinition宽度=2 */＆GT;
                    ＆LT; ColumnDefinition宽度=2 */＆GT;
                    ＆LT; ColumnDefinition WIDTH =50/＆GT;
                ＆LT; /Grid.ColumnDefinitions>
                ＆所述; TextBlock的Grid.Column =0的文本={结合SourceType中，转换器= {的StaticResource WorkItemTypeToStringConverter}}/＆GT;
                ＆LT;组合框Grid.Column =1的SelectedItem ={结合DESTTYPE}的ItemsSource ={结合WorkItemTypesForCurrentDestProject，源= {X：静态LOC：MainMediator.Instance}，诊断：presentationTraceSources.TraceLevel =高}的DisplayMemberPath =名称/＆GT;

                ＆LT;！ - 这是一个按钮 - ＆GT;
                ＆所述;按钮Grid.Column =2内容={结合PercentMapped}
                        点击=ManualMappingClick/＆GT;
            ＆LT; /网格＆GT;
        ＆LT; / DataTemplate中＆GT;
    ＆LT; /ListBox.ItemTemplate>
＆LT; /列表框＆GT;
 

解决方案

你可以做什么作为一个替代方案是使用，而不是事件的命令。如果你的按钮绑定到一个命令，并与它一起传递命令参数，你应该能够得到的是关系到该按钮的项目。例如：code：

 ＆LT;！ - 这是一个按钮 - ＆GT;
 ＆LT;按钮
     Grid.Column =2
     内容={结合PercentMapped}
     命令=SolutionNamespace：CommandClass.ButtonClickedCommand
     CommandParameter ={结合}/＆GT;
 

我不知道你是如何熟悉与WPF指挥，但你会发现，CommandParameter结合上下文没有路径名，也就是说它绑定到你需要的WorkItemTypeMappings。

命令示例code：

 公共静态SimpleCommand ButtonClickedCommand {获得;组; }

静态CommandClass（）
{
    ButtonClickedCommand =新SimpleCommand
                           {
                               ExecuteDelegate =
                               X =＆GT; ButtonClicked（x作为WorkItemTypeMappings）
                           };
}


公共静态ButtonClicked（WorkItemTypeMappings映射）
{
    如果（映射！= NULL）的MessageBox.show（mapping.PercentMapped）
}
 

您会发现，ButtonClickedCommand是静态的，这是必需的，因为按钮无法从当前绑定上下文访问命令。

SimpleCommand 是ICommand的只是一个简单的实现，可以谷歌这一个，如果你不知道。我希望这不是矫枉过正您的问题，但你不能去错了WPF命令。

祝你好运。

I have a ListBox with a DataTemplate. The template has a Button on it. When the Button is clicked I want to do some logic with the object that is each row (in this case an object called WorkItemTypeMappings).

In theOnClick how can I go from the Button (object sender) to the object that is row that the button is on?

Here is the XAML of my ListBox:

<ListBox ItemsSource="{Binding Source={StaticResource WorkItemTypeMappingsCollectionView}}" HorizontalContentAlignment="Stretch" ScrollViewer.HorizontalScrollBarVisibility="Disabled" Name="lstWITypes">
    <ListBox.GroupStyle>
        <x:Static Member="GroupStyle.Default"/>
    </ListBox.GroupStyle>
    <ListBox.ItemTemplate>
        <DataTemplate>
            <Grid HorizontalAlignment="Stretch">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="2*"/>
                    <ColumnDefinition Width="2*"/>
                    <ColumnDefinition Width="50"/>
                </Grid.ColumnDefinitions>
                <TextBlock Grid.Column="0" Text="{Binding SourceType, Converter={StaticResource WorkItemTypeToStringConverter}}"/>
                <ComboBox Grid.Column="1" SelectedItem="{Binding DestType}" ItemsSource="{Binding WorkItemTypesForCurrentDestProject, Source={x:Static loc:MainMediator.Instance}, diagnostics:PresentationTraceSources.TraceLevel=High}" DisplayMemberPath="Name" />

                <!-- This is the button-->
                <Button Grid.Column="2" Content="{Binding PercentMapped}" 
                        Click="ManualMappingClick"/>
            </Grid>
        </DataTemplate>                                        
    </ListBox.ItemTemplate>
</ListBox>

解决方案

What you can do as an alternative is to use Command instead of Event. If you bind your button to a command and pass along with it a command parameter, you should be able to get the item that is related to that button. Example code:

<!-- This is the button-->
 <Button
     Grid.Column="2"
     Content="{Binding PercentMapped}" 
     Command="SolutionNamespace:CommandClass.ButtonClickedCommand"
     CommandParameter="{Binding}" />

I am not sure how familiar you are with WPF commanding but you will notice that the CommandParameter binds to the context without a path name, that is to say it binds to the WorkItemTypeMappings that you need.

Command Example Code:

public static SimpleCommand ButtonClickedCommand { get; set; }

static CommandClass()
{
    ButtonClickedCommand = new SimpleCommand
                           {
                               ExecuteDelegate =
                               x=> ButtonClicked(x as WorkItemTypeMappings)
                           };
}


public static ButtonClicked(WorkItemTypeMappings mappings)
{
    if(mappings != null) MessageBox.Show(mapping.PercentMapped)
}

You will notice that the ButtonClickedCommand is static, this is required because the button cannot access the command from its current binding context.

SimpleCommand is just a simplified implementation of the ICommand, can Google this one if you're not sure. I hope this is not an overkill to your problem, but you cannot go wrong with WPF Commands.

Good luck.

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