FrameworkElementFactory 必须位于密封模板中才能执行此操作

发布于 2024-11-28 13:22:41 字数 781 浏览 0 评论 0原文

我编写了一个片段来通过 C# 代码创建自己的 DataTemplate。我将其添加到数据网格列的编辑模板中。当我调用 object templateContent = tc.CellTemplate.LoadContent ( ); 时，应用程序崩溃了，并向我抛出一个异常，即“FrameworkElementFactory 必须位于此操作的密封模板中。”。这是我创建数据模板的代码。

public override DataTemplate GenerateCellTemplate ( string propertyName )
    {
        DataTemplate template = new DataTemplate ( );
        var textBlockName = string.Format ( "{0}_TextBlock", propertyName );
        FrameworkElementFactory textBoxElement = new FrameworkElementFactory ( typeof ( TextBlock ), textBlockName );
        textBoxElement.SetBinding ( TextBlock.TextProperty, new Binding ( propertyName ) );
        template.VisualTree = textBoxElement;
        Trigger trigger = new Trigger ( );
        return template;
    }

原文

I wrote a snippet to create a own DataTemplate by c# code. And i add it to datagrid column's editing template.
When i called object templateContent = tc.CellTemplate.LoadContent ( );, the application crashed, and throw me a exception which is "FrameworkElementFactory must be in a sealed template for this operation.".
This is the code i create my datatemplate.

public override DataTemplate GenerateCellTemplate ( string propertyName )
    {
        DataTemplate template = new DataTemplate ( );
        var textBlockName = string.Format ( "{0}_TextBlock", propertyName );
        FrameworkElementFactory textBoxElement = new FrameworkElementFactory ( typeof ( TextBlock ), textBlockName );
        textBoxElement.SetBinding ( TextBlock.TextProperty, new Binding ( propertyName ) );
        template.VisualTree = textBoxElement;
        Trigger trigger = new Trigger ( );
        return template;
    }

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热血少△年 2024-12-05 13:22:41

我在reflector中反映了框架模板代码。我发现 tc.CellTemplate.LoadContent () 与类 FrameworkTemplate 中名为“_sealed”的私有字段有关。

然后我找到了要设置值的字段，调用这个方法，问题就解决了。

这是解决方案：

public override DataTemplate GenerateCellTemplate ( string propertyName )
{
    DataTemplate template = new DataTemplate ( );
    var textBlockName = string.Format ( "{0}_TextBlock", propertyName );
    FrameworkElementFactory textBoxElement = new FrameworkElementFactory ( typeof ( TextBlock ), textBlockName );
    textBoxElement.SetBinding ( TextBlock.TextProperty, new Binding ( propertyName ) );
    template.VisualTree = textBoxElement;
    Trigger trigger = new Trigger ( );

    // This solves it!
    template.Seal();

    return template;
}

I reflect the framework template code in reflector. And i found tc.CellTemplate.LoadContent ( ) is concerned with a private field named "_sealed" in the class FrameworkTemplate.

Then i found the field where be set value, and i call this method, the problem is solved.

Here is the solution:

public override DataTemplate GenerateCellTemplate ( string propertyName )
{
    DataTemplate template = new DataTemplate ( );
    var textBlockName = string.Format ( "{0}_TextBlock", propertyName );
    FrameworkElementFactory textBoxElement = new FrameworkElementFactory ( typeof ( TextBlock ), textBlockName );
    textBoxElement.SetBinding ( TextBlock.TextProperty, new Binding ( propertyName ) );
    template.VisualTree = textBoxElement;
    Trigger trigger = new Trigger ( );

    // This solves it!
    template.Seal();

    return template;
}

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