Roslyn:如何获取与标识符关联的ITypeSymbol？

using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;

// 创建一个CSharpCompilation对象
var compilation = CSharpCompilation.Create("MyCompilation");

// 解析源代码文件
var syntaxTree = CSharpSyntaxTree.ParseText(sourceCode);

// 获取根节点
var root = syntaxTree.GetRoot() as CompilationUnitSyntax;

// 获取语义模型
var semanticModel = compilation.GetSemanticModel(syntaxTree);

// 找到标识符节点
var identifierNode = root.DescendantNodes().OfType<IdentifierNameSyntax>().FirstOrDefault();

// 获取标识符关联的ITypeSymbol
var typeSymbol = semanticModel.GetTypeInfo(identifierNode).Type;