c# - 从 Visual Studio 文本装饰扩展中获取当前文件名

Question

我是 VS 扩展开发的新手。我目前正在使用 VS 2015 中的文本装饰示例，并且能够正确显示彩色框。现在我想扩展示例，使装饰只出现在某些文件名上。

谷歌搜索说我可以使用 ITextDocumentFactoryService.TryGetTextDocument 接口(interface)和 IWpfTextView.TextBuffer 属性来获取文件名。这听起来不错。但我似乎无法实际获取界面。

在我的课上我有:

    [Import]
    public ITextDocumentFactoryService TextDocumentFactoryService = null;

但它始终为 NULL。

如何获取 ITextDocumentFactoryService？

namespace Test
{
    internal sealed class TestAdornment
    {
        [Import]
        public ITextDocumentFactoryService TextDocumentFactoryService = null;

        public TestAdornment(IWpfTextView view)
        {
        }

        /// <summary>
        /// Adds the scarlet box behind the 'a' characters within the given line
        /// </summary>
        /// <param name="line">Line to add the adornments</param>
        private void CreateVisuals(ITextViewLine line)
        {
            // TextDocumentFactoryService is NULL
        }
    }
}

Answer 1

TextAdornmentTextViewCreationListener.cs

[Export(typeof(IWpfTextViewCreationListener))]
[ContentType("text")]
[TextViewRole(PredefinedTextViewRoles.Document)]
internal sealed class TextAdornmentTextViewCreationListener : IWpfTextViewCreationListener
{
    [Import]
    public ITextDocumentFactoryService textDocumentFactory { get; set; }

    //...

    public void TextViewCreated(IWpfTextView textView)
    {
        new TextAdornment(textView, textDocumentFactory);
    }
}

TextAdornment.cs

internal sealed class TextAdornment
    {
        private readonly ITextDocumentFactoryService textDocumentFactory;
        private ITextDocument TextDocument;

        //...    

        public TextAdornment(IWpfTextView view, ITextDocumentFactoryService textDocumentFactory)
        {
            //...

            this.textDocumentFactory = textDocumentFactory;

            //...
        }

     internal void OnLayoutChanged(object sender, TextViewLayoutChangedEventArgs e)
        {
            var res = this.textDocumentFactory.TryGetTextDocument(this.view.TextBuffer, out this.TextDocument);
            if (res)
            {
                //this.TextDocument.FilePath;
            }
            else
            {
                //ERROR
            }
        }
    }