C#-Roslyn:SyntaxNode转换为FieldDeclarationSyntax

Question

我有一个字段 SyntaxNode:

            CancellationTokenSource source = new CancellationTokenSource();
            CancellationToken token = source.Token;
            SyntaxNode root = await CSharpSyntaxTree.ParseText("int i= 0;").GetRootAsync(token);

我看到文档了：

Inheritance->Object->SyntaxNode->
CSharpSyntaxNode->
MemberDeclarationSyntax->BaseFieldDeclarationSyntax->FieldDeclarationSyntax

我有 ClassDeclarationSyntax :

private ClassDeclarationSyntax _classDeclaration;

我想将 SyntaxNode 转换成 FieldDeclarationSyntax，然后添加到 ClassDeclarationSyntax。

我该如何处理？

Answer 1

你可以用这样的东西做你想做的事：

using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using System.Linq;

VariableDeclarationSyntax variableDeclaration = CSharpSyntaxTree.ParseText("int i= 0;")
    .GetRoot()
    .DescendantNodes()
    .OfType<VariableDeclarationSyntax>()
    .Single();

_classDeclaration = _classDeclaration
    .WithMembers(
        SyntaxFactory.SingletonList<MemberDeclarationSyntax>(
            SyntaxFactory.FieldDeclaration(variableDeclaration)));

您首先需要通过解析创建变量声明语法。然后下降根节点以检索它。然后将该节点附加到新的 FieldDeclaration。虽然我很好奇你想在这里做什么。 Microsoft.CodeAnalysis.Editing命名空间下有SyntaxRewriter type if you want help changing the code of a tree. There is also the general codefix infrastucture and SyntaxEditor。

C#-Roslyn:SyntaxNode转换为FieldDeclarationSyntax

C#-Roslyn:SyntaxNode is converted to FieldDeclarationSyntax

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