Question

我正在尝试在Visual Studio扩展包中的VSSDK和Roslyn SDK之间架起桥梁，并且一直很难用。 Visual Studio提供的ActivePoint.AbsoluteCharOffset与使用FindToken（offset）时从Roslyn获取的元素不匹配。我相当肯定这与每一方如何基于我当前的工作黑客计算EOL字符有关，但我不是100％，我的黑客将长期坚持。

我的黑客就是这句话：charOffset += point.Line;

我在char偏移量上添加行数，这似乎有效，所以我猜测我正在添加被activepoint计数忽略的所有换行符。

助手

private VisualStudioWorkspace workspace = null;
public RoslynUtilities(VisualStudioWorkspace workspace)
{
    this.workspace = workspace;
}
public Solution Solution { get { return workspace.CurrentSolution; } }
public Document GetDocumentFromPath(string fullPath)
{
    foreach (Project proj in this.Solution.Projects)
    {               
        foreach (Document doc in proj.Documents)
        {
            if (doc.FilePath == fullPath)
                return doc;                   
        }
    }
    return null;
}
public SyntaxTree GetSyntaxTreeFromDocumentPath(string fullPath)
{
    Document doc = GetDocumentFromPath(fullPath);
    if (doc != null)
        return doc.GetSyntaxTreeAsync().Result;
    else
        return null;
}
public SyntaxNode GetNodeByFilePosition(string fullPath, int absoluteChar)
{
    SyntaxTree tree = GetSyntaxTreeFromDocumentPath(fullPath);
    if(tree != null)
    {
        var compUnit = tree.GetCompilationUnitRoot();
        if(compUnit != null)
        {
            return compUnit.FindToken(absoluteChar, true).Parent;
        }
    }
    return null;                        
}
private VisualStudioWorkspace GetRoslynWorkspace()
    {
        var componentModel = (IComponentModel)GetGlobalService(typeof(SComponentModel));
        return componentModel.GetService<VisualStudioWorkspace>();
    }

主要部分

EnvDTE80.DTE2 applicationObject = (EnvDTE80.DTE2)GetService(typeof(SDTE));
EnvDTE.TextSelection ts = applicationObject.ActiveWindow.Selection as EnvDTE.TextSelection;
if (ts == null)
    return;

EnvDTE.VirtualPoint point = ts.ActivePoint;
int charOffset = point.AbsoluteCharOffset;
charOffset += point.Line;//HACK ALERT

Parse.Roslyn.RoslynUtilities roslyn = new Parse.Roslyn.RoslynUtilities(GetRoslynWorkspace());
SyntaxNode node = roslyn.GetNodeByFilePosition(applicationObject.ActiveDocument.FullName, charOffset);

Answer 1

我强烈建议您使用Microsoft.VisualStudio.Text.SnapshotPoint缓冲区中的Microsoft.VisualStudio.Text.Editor.IWpfTextView而不是EnvDTE接口与Roslyn进行交互。

主要代码可能如下所示：

Microsoft.VisualStudio.Text.Editor.IWpfTextView textView =
    GetTextView();

Microsoft.VisualStudio.Text.SnapshotPoint caretPosition =
    textView.Caret.Position.BufferPosition;

Microsoft.CodeAnalysis.Document document =
    caretPosition.Snapshot.GetOpenDocumentInCurrentContextWithChanges();

Microsoft.CodeAnalysis.CSharp.Syntax.InvocationExpressionSyntax invocationExpressionNode = 
    document.GetSyntaxRootAsync().Result.
        FindToken(caretPosition).Parent.AncestorsAndSelf().
        OfType<Microsoft.CodeAnalysis.CSharp.Syntax.InvocationExpressionSyntax>().
        FirstOrDefault();

有关完整示例，请参阅Create a typed variable from the current method invocation。

从Visual Studio文本选择中获取Roslyn SyntaxToken（插入位置）

1 个答案: