WPF将路径绑定到类的typename [英] WPF binding a path to the typename of a class

问题描述

使用WPF，我想将GroupBox的标题绑定到多态类的类型名。所以如果我有一个名为Element的类，以及派生自Element的两个类，例如BasicElement和AdvancedElement，我希望GroupBox的标题表示BasicElement或AdvancedElement。这是我用于GroupBox的xaml。它是由ItemsControl使用的DataTemplate的一部分。我希望在XAML中代替Path = DerivedTypeNameOf（group），其中group是组数组中的每个组。

Using WPF, I want to bind the header of a GroupBox to the typename of a polymorphic class. So if I have a class called Element, and two classes that derive from Element, such as BasicElement and AdvancedElement, I want the header of the GroupBox to say "BasicElement" or "AdvancedElement". Here is the xaml I am using for the GroupBox. It's part of a DataTemplate being used by an ItemsControl. I'm hoping for something in place of Path=DerivedTypeNameOf(group) in the XAML, where group is each group in the groups array.

请注意，TheData的ObjectInstance正在设置为GroupSet的有效实例，该实例包含一些BasicGroups和AdvancedGroups的数组。

Note that the ObjectInstance of TheData is being set to a valid instance of GroupSet which holds an array of some BasicGroups and AdvancedGroups.

以下是相关的代码隐藏类：

Here are the pertinent code-behind classes:

public class Group
{
    public string groupName;

    public string df_groupName
    {
        get { return this.groupName; }
        set { this.groupName = value; }
    }
}

public class BasicGroup : Group
{

}

public class AdvancedGroup : Group
{

}

public class GroupSet
{
    public Group [] groups;

    public Group [] df_groups
    {
        get { return this.groups; }
        set { this.groups = value; }
    }
};

这是XAML：

<UserControl.Resources>
    <ResourceDictionary>
        <ObjectDataProvider x:Key="TheData" />

        <DataTemplate x:Key="GroupTemplate">
            <GroupBox Header="{Binding Path=DerivedTypeNameOf(group)}">
                <TextBox Text="This is some text"/>
            </GroupBox>
        </DataTemplate>

    </ResourceDictionary>
</UserControl.Resources>

    <ItemsControl ItemsSource="{Binding Source={StaticResource TheData}, Path=groups}" ItemTemplate="{StaticResource GroupTemplate}">
        <ItemsControl.ItemsPanel>
            <ItemsPanelTemplate>
                <StackPanel />
            </ItemsPanelTemplate>
        </ItemsControl.ItemsPanel>
    </ItemsControl>

推荐答案

为什么不添加

public abstract string DerivedTypeName { get; set; }

到您的基类，并为每个派生类型覆盖它，那么您只需绑定到一个字符串。

to your base class and override it for each derived type then you are simply binding to a string.

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