如何在代码中绑定到DataTemplate？ [英] How can I bind to a DataTemplate in code?

问题描述

我有一个在XAML中定义的数据模板，可以通过调用 App.Current.Resources [ foo] 进行访问。我无法在 XAML 中定义模板上的数据绑定，因为无法从可视化树访问绑定的源（源为 DataGridColumn 类型对象），所以我必须在后面的代码中定义绑定。

I have a data template defined in XAML and accessible by calling App.Current.Resources["foo"]. I can't define the Data Bindings on the template in XAML because the source for the bindings is not accessible from the visual tree ( the sources are DataGridColumn type objects ), so I have to define the bindings in code behind.

如何将绑定附加到 DataTemplate ，这样在调用 .LoadContent（）时，结果将尊重指定的数据绑定吗？

How do I attach bindings to a DataTemplate so that when .LoadContent( ) is called, the result will have respect the specified data bindings?

符合最小，完整和可验证的示例要求：

In compliance with the Minimal, Complete and Verifiable Example Requirements:

确定已为APP.XAML文件设置了构建操作

App.xaml：

<Application
    x:Class="MCVE.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:MCVE" StartupUri="MainWindow.xaml">
    <Application.Resources>
        <DataTemplate x:Key="Template">
            <TextBlock />
        </DataTemplate>
    </Application.Resources>
</Application>

App.xaml.cs：

App.xaml.cs:

using System;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Markup;
using System.Xml;

namespace MCVE {
/// <summary>
/// Interaction logic for App.xaml
/// </summary>
    public partial class App {
        [STAThread]
        public static int Main( ) {
            App program = new App( );
            program.InitializeComponent( );
            DataTemplate foo = program.Resources["Template"] as DataTemplate;
            DataGridTemplateColumn source = new DataGridTemplateColumn( );
            source.Header = "Foo";
            Binding b = new Binding( ) {
                Path = new PropertyPath(
                    DataGridColumn.HeaderProperty ),
                Source = source
            };

            //How do I set the binding to the TextBlock within
            //the DataTemplate so that the next time the
            //template is loaded, the TextBlock will
            //read "Foo"?

            return program.Run( );
        }
    }
}

推荐答案

如何将绑定附加到 DataTemplate ，以便当 .LoadContent（）时，结果将尊重指定的数据绑定吗？

How do I attach bindings to a DataTemplate so that when .LoadContent( ) is called, the result will have respect the specified data bindings?

您可以在模板本身中定义绑定。您不能定义没有模板绑定的模板，然后立即将绑定应用于此模板。模板必须整体定义，因此恐怕这种方法将行不通。

You define the bindings in the template itself. You cannot define a template witout bindings and then apply the bindings to this template on the fly. A template must de defined "as a whole" so this approach won't work I am afraid.

而不是在 App.xaml 中定义 DataTemplate ，您可以考虑使用 XamlReader.Parse 方法以编程方式创建具有不同数据绑定的不同模板，例如：

Instead of defining the DataTemplate in App.xaml, you may consider to create different templates with different data bindings programmatically using the XamlReader.Parse method, e.g.:

string fooTemplate = "<DataTemplate xmlns=\"http://schemas.microsoft.com/winfx/2006/xaml/presentation\" xmlns:x = \"http://schemas.microsoft.com/winfx/2006/xaml\"><TextBlock Text=\"{Binding Foo}\"></DataTemplate>";
source.CellTemplate = XamlReader.Parse(fooTemplate) as DataTemplate;

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