从 Roslyn 中的行号获取节点 [英] Getting node from line number in Roslyn

问题描述

如何根据行号获取SyntaxNode?否则，如果有可能获得该行号的 LineSpan 然后到节点.

How can I get a SyntaxNode based on a line number? Else if its possible to get LineSpan of that line number then to node.

推荐答案

您可以从文档文本中获取行的跨度.从那里，您可以找到与线跨度相交的所有节点.这将返回多个语法节点，然后您可以使用您的条件来提取您要查找的一个:

You can get the span of a line from the document text. From there, you can find all nodes that intersect with the span of the line. This will return multiple syntax nodes, which you can then use your criteria to pull out the one you are looking for:

    static void Main(string[] args)
    {
        var code = @"
using System;

namespace ConsoleApplication1
{
    class TypeName
    {   
         public int Add(int x, int y) 
         {
             return x+y;
         }
     }
}";
        var st = SourceText.From(code);
        var sf = SyntaxFactory.ParseSyntaxTree(st);

        var span = sf.GetText().Lines[9].Span;
        var nodes = sf.GetRoot().DescendantNodes().Where(x => x.Span.IntersectsWith(span));

        Console.WriteLine(nodes.Last().ToString());
        Console.ReadKey();
    }

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