查找包含给定SyntaxNode

Question

我有以下源代码：

public void MethodAssignment_WithIndexQuery_1(Customer from1, Customer to1, decimal amount) 
{
     var customers = _customerRepository.GetWhere(to1.Age);
     Customer indexCustomer1 = customers[(from1.Age + to1.Age)* to1.Age];
}

我在索引参数中的表达式中给出了SyntaxNode：node = from1.Age 。

这样做会产生null：

MethodDeclarationSyntax callingMethod = node
                .GetLocation()
                .SourceTree
                .GetRoot()
                .FindToken(location.SourceSpan.Start)
                .Parent
                .AncestorsAndSelf()
                .OfType<MethodDeclarationSyntax>()
                .FirstOrDefault();

执行node.Parent.Parent会返回BinaryExpressionSyntax AddExpression from1.Age * to2.Age+ to1.Age * to2.Age并执行 Parent 会产生 null 。

如何找到包含给定语法节点的MethodDeclaration？

Answer 1

final list = List.filled(5, 0); print(list); //-> [0, 0, 0, 0, 0] 允许您查找特定节点。以下是获取所有SyntaxWalker节点的示例：

AddExpression

如果你在declarationsyntax的public class MethodDeclarationSyntaxWalker : CSharpSyntaxWalker { private readonly IList<MethodDeclarationSyntax> _matches; public MethodDeclarationSyntaxWalker( IList<MethodDeclarationSyntax> matches ) { _matches = matches; } public override void VisitBinaryExpression( BinaryExpressionSyntax node ) { if ( node.Kind() == SyntaxKind.AddExpression ) _matches.Add( node.FirstAncestorOrSelf<MethodDeclarationSyntax>() ); base.VisitBinaryExpression( node ); } } 函数中传递它，它将收集给定节点的匹配项。例如：

Accept

Answer 2

您可以通过Ancestors()检索节点的封闭方法：

MethodDeclarationSyntax callingMethod = node
                .Ancestors()
                .OfType<MethodDeclarationSyntax>()
                .FirstOrDefault();