Question

我正在视觉工作室进行扩展。但使用IElisionBuffer和IDifferenceBuffer时出错。以下是我的代码。

    public ViewportAdornment1(IWpfTextView view, IProjectionBufferFactoryService projectionBufferFactory, IDifferenceBufferFactoryService differenceBufferFactory)
    {
        _projectionBufferFactory = projectionBufferFactory;
        _differenceBufferFactory = differenceBufferFactory;
        _view = view;

        NormalizedSnapshotSpanCollection span = new NormalizedSnapshotSpanCollection(_view.TextSnapshot, new Span(5, 10));
        _buffer = _projectionBufferFactory.CreateElisionBuffer(null, span, ElisionBufferOptions.FillInMappingMode);
        IProjectionSnapshot snapshot = _buffer.ElideSpans(span);
        IDifferenceBuffer differenceBuffer = _differenceBufferFactory.CreateDifferenceBuffer(_view.VisualSnapshot.TextBuffer, snapshot.TextBuffer);
        differenceBuffer.SnapshotDifferenceChanged += ApplySnapshotDifference;
    }

    private void ApplySnapshotDifference(object sender, SnapshotDifferenceChangeEventArgs e)
    {
        ISnapshotDifference snapshotDifference = e.After.DifferenceBuffer.CurrentSnapshotDifference;
        var diffs = snapshotDifference.LineDifferences;
        ITextEdit edit = _buffer.CreateEdit(EditOptions.DefaultMinimalChange, null, "myedit");
        foreach (var diff in diffs)
        {
            edit.Replace(diff.Left, diff.After.ToString());
        }
        edit.Apply();
    }

下面似乎是内部异常，但我不知道出了什么问题。

        IDifferenceBuffer differenceBuffer = _differenceBufferFactory.CreateDifferenceBuffer(_view.VisualSnapshot.TextBuffer, snapshot.TextBuffer);

https://msdn.microsoft.com/query/dev14.query?appId=Dev14IDEF1&l=EN-US&k=k(Microsoft.VisualStudio.Text.Differencing.IDifferenceBuffer);k(TargetFrameworkMoniker-.NETFramework,Version%3Dv4.5);k(DevLang-csharp)&rd=true

MSDN备注：“差异是在后台线程中计算的响应各种变化（文本更改，选项更改等），虽然围绕差异的所有事件，如 SnapshotDifferenceChanged将在拥有该主机的线程上引发 LeftBuffer和RightBuffer（通常是UI线程）。“

（我无法上传图片）错误弹出窗口说：

未处理的类型异常   mscorlib.dll中发生'System.Reflection.TargetInvocationException'

附加信息：目标是抛出异常   调用

P.S。我的目标是制作一个链接到某些文本的装饰框，例如错误弹出窗口（但替换文本）。有没有比使用IElisionBuffer更容易实现的方法？

IDifferenceBuffer错误 - （调用目标引发了异常。）

0 个答案: