我如何可以调用XAML与TabItem的名称的参数绑定方法？ [英] How can I call a bound method in XAML with the parameter of a TabItem's name?

问题描述

我有在XAML绑定一个对象的实例。它有将回到我的其他对象的列表的方法（基于属性值我通过这个方法，它将返回所有对象与属性值）。

I've got an instance of an object bound in XAML. It's got a method that will return to me a list of other objects (based on the property value I pass this method, it will return all the objects with that property value).

<ObjectDataProvider ObjectInstance="_this.DataContext" MethodName="GetListByCategory" x:Key="List">
        <ObjectDataProvider.MethodParameters>
            <System:String>Windows</System:String>
        </ObjectDataProvider.MethodParameters>
    </ObjectDataProvider>

我（最终）希望与一些令人费解的DataTemplate一个选项卡上显示该列表。而不是获得超前了。

I (eventually) want to display this list on a tab with some convoluted DataTemplate. But not to get ahead of myself.

我希望得到所有应显示在一个特定的TabItem的一个TabControl（那些具有一个类别匹配TabItem的名称或标题内的对象 - 这是在完成的方法）。我如何通过我的绑定方法有关TabItem的的标题或名称？

I want to get all the objects that should be displayed on a particular TabItem inside a TabControl (ones that have a category matching the TabItem's name or header - this is done in the method). How do I pass my bound method the relevant TabItem's header or name?

请记住，我需要绑定到这个绑定方法的返回值在一个DataTemplate中显示在TabItem的。我不知道这是否必然相关的问题的答案，但我要确保我在界定清楚。

Bear in mind that I need to bind to the return value of this bound method to display in a DataTemplate in the TabItem. I don't know if that would necessarily be relevant to the answer of the problem but I want to make sure that I'm clear in defining it.

推荐答案

不幸的是， MethodParameters 的的ObjectDataProvider 不能直接约束。

Unfortunately the MethodParameters of an ObjectDataProvider can't be bound directly.

您可以使用双向或 OneWayToSource 绑定。下面是一个使用 Directory.GetFiles 为你的 GetListByCategory 法的替代一个例子：

You can get around this by using a TwoWay or OneWayToSource binding. Here's an example that uses Directory.GetFiles as a substitute for your GetListByCategory method:

<Grid xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:sys="clr-namespace:System;assembly=mscorlib"
      xmlns:io="clr-namespace:System.IO;assembly=mscorlib"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Grid.Resources>
        <x:Array x:Key="directories" Type="{x:Type sys:String}">
            <sys:String>C:\</sys:String>
            <sys:String>C:\Windows\</sys:String>
            <sys:String>C:\Windows\System32\</sys:String>
        </x:Array>
        <ObjectDataProvider x:Key="fileList" ObjectType="{x:Type io:Directory}" MethodName="GetFiles">
            <ObjectDataProvider.MethodParameters>
                <!-- Initial value, this will get wiped out by the Binding below. -->
                <sys:String>C:\</sys:String>
            </ObjectDataProvider.MethodParameters>
        </ObjectDataProvider>
    </Grid.Resources>
    <TabControl ItemsSource="{StaticResource directories}">
        <TabControl.ItemContainerStyle>
            <Style TargetType="{x:Type TabItem}">
                <Setter Property="ContentTemplate">
                    <Setter.Value>
                        <DataTemplate DataType="{x:Type sys:String}">
                            <ListBox ItemsSource="{Binding Source={StaticResource fileList}}"/>
                        </DataTemplate>
                    </Setter.Value>
                </Setter>
            </Style>
        </TabControl.ItemContainerStyle>
        <TabControl.SelectedItem>
            <Binding Source="{StaticResource fileList}"    
                     Path="MethodParameters[0]"
                     BindsDirectlyToSource="True"  
                     Mode="OneWayToSource"/>
        </TabControl.SelectedItem>
    </TabControl>
</Grid>

的

TabControl.SelectedItem 绑定到 ObjectDataProvider.MethodParameters [0] 使用OneWayToSource，这样，当我们改变标签，方法的参数更改为新的目录。

The TabControl.SelectedItem is bound to the ObjectDataProvider.MethodParameters[0] using OneWayToSource, so that when we change tabs, the method parameter changes to the new directory.

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