roslyn 中的 #if 指令代码解析

Question

我尝试使用 Roslyn 从我的 CS 文件中提取部分代码，但遇到了以下问题。

我的 C# 文件代码：

    class ConditionalCompilationCode
    {
#if Condition2
            int test2=0; 
#endif
#if Condition1
            int test1=0; 
#endif

        public static void Main1(string[] args)
        {
            int test = 0;
#if Condition1
            test = 1;
#else
            test =2;
#endif

#if Condition2
            test =3;
#else
            test = 4;
#endif

        }
#if Condition2
            private void testmethod1()
        {
            test2 = 1;
        }
#endif
#if !Condition2
        private void testmethod2()
        {
            test1 = 1;
        }
#endif
#if Condition1
        private void testmethod3()
        {
            test1 = 1;
        }
#endif
#if !Condition1
            private void testmethod4()
        {
            test2 = 1;
        }
#endif
    }
}

我的 roslyn 代码：

string fileContent = File.ReadAllText(fileName);

SyntaxTree syntaxTree = CSharpSyntaxTree.ParseText(fileContent);

var syntaxRootNode = syntaxTree.GetRoot();
            if (syntaxRootNode.GetFirstToken().Kind() == SyntaxKind.None)
                return;
            foreach (NamespaceDeclarationSyntax namespaceSyntax in syntaxRootNode.DescendantNodes().OfType<NamespaceDeclarationSyntax>().ToArray())
            {

                IEnumerable<SyntaxNode> nodeList = namespaceSyntax.ChildNodes();
                string className = null;
                foreach (SyntaxNode syntaxNode in nodeList)
                {
                    SyntaxKind kind = syntaxNode.Kind();
                    switch (kind)
                    {
                        case SyntaxKind.ClassDeclaration:
                            UpdateClassSignature(syntaxNode as TypeDeclarationSyntax);                            
                            break;
                        case SyntaxKind.EnumDeclaration:

                            break;
                        case SyntaxKind.InterfaceDeclaration:

                            break;
                        case SyntaxKind.StructDeclaration:

                            break;

                    }

                }

            }

    private void UpdateClassSignature(TypeDeclarationSyntax classDeclarationSyntax)
        {

            foreach (MemberDeclarationSyntax member in classDeclarationSyntax.Members)
            {
                SyntaxKind kind = member.Kind();
                switch (kind)
                {
                    case SyntaxKind.FieldDeclaration:
                        break;
                    case SyntaxKind.PropertyDeclaration:
                        break;
                    case SyntaxKind.MethodDeclaration:
                    case SyntaxKind.ConstructorDeclaration:
                    case SyntaxKind.DestructorDeclaration:
                        break;
                    case SyntaxKind.IndexerDeclaration:
                        ExtractIndexer(member as IndexerDeclarationSyntax, classSign);
                        break;
                    case SyntaxKind.DelegateDeclaration:
                        //TODO: Add Delegate Support.
                        break;
                    case SyntaxKind.OperatorDeclaration:
                    case SyntaxKind.ConversionOperatorDeclaration:
                        //Skip.
                        //TODO: Need to add operator suport.
                        break;
                    case SyntaxKind.EventFieldDeclaration:
                        //TODO: Add support to event.
                        break;
                    case SyntaxKind.EventDeclaration:
                        //TODO: Add support to event.
                        break;
                    case SyntaxKind.EnumDeclaration:
                        break;
                    case SyntaxKind.ClassDeclaration:
                        break;
                    case SyntaxKind.StructDeclaration:
                        break;
                    default:
                        break;
                }
            }
        }

在使用 roslyn 处理上述 CS 文件时，在类DeclarationSyntax.Members 中包含以下三个值：

1. MethodDeclarationSyntax 方法声明

   public static void Main1(string[] args)
   {
       int test = 0;
       #if Condition1
       test = 1;
       #else
       test =2;
       #endif
   
      #if Condition2
       test =3;
      #else
       test = 4;
     #endif
   
   }
   

2. MethodDeclarationSyntax 方法声明

   private void testmethod2()
   {
       test1 = 1;
   }
   

3. MethodDeclarationSyntax 方法声明

   private void testmethod4()
   {
       test2 = 1;
   }
   

我的项目只有“Condition1”指令。仅当条件只有“Condition1”时，您能帮我获取代码吗？

提前致谢。

Answer 1

您需要传递一个调用WithPreprocessorSymbols() 的CSharpParseOptions 以将您要定义的符号传递给解析器。