.NET SourceGenerator API接口生成实现类

Posted 2022-03-23 EdisonTalk

Identity a Interface which will be implemented by SourceGenerators: HttpClient name Name Create a new Create a new with given name name) Name = name; Identity a method send HTTP Get request: Creates a new with the given route template. template) : HTTP method abstract type for common encapsulation: Route template Template Creates a new with the given route template. template) Template = template; ... /> /> /> ... : List<INamedTypeSymbol> TypeSymbols List<INamedTypeSymbol>(); (context.Node InterfaceDeclarationSyntax ids && ids.AttributeLists.Count > typeSymbol = ModelExtensions.GetDeclaredSymbol(context.SemanticModel, ids) INamedTypeSymbol; (typeSymbol!.GetAttributes().Any(x => x.AttributeClass!.ToDisplayString() == TypeSymbols.Add(typeSymbol); httpClientName, requestUri) returnType = (methodSymbol.ReturnType INamedTypeSymbol).TypeArguments[ cancellationToken = methodSymbol.Parameters.Last().Name; source = GenerateHttpClient(typeSymbol, methodSymbol, httpClientName); source.AppendLine( source.AppendLine( source.AppendLine( source.AppendLine( source.ToString();extensionSource = StringBuilder( public static class ScanInjectOptions public static void AddGeneratedHttpClient(this IServiceCollection services) (typeSymbol receiver.TypeSymbols) ... extensionSource.AppendLine( extensionSource.AppendLine( extensionTextFormatted = CSharpSyntaxTree .ParseText(extensionSource.ToString(), CSharpParseOptions(LanguageVersion.CSharp8)).GetRoot() .NormalizeWhitespace().SyntaxTree.GetText().ToString(); context.AddSource( SourceText.From(extensionTextFormatted, Encoding.UTF8));: HashSet<INamedTypeSymbol> _httpClientTypeSymbols; _httpClientTypeSymbols = HashSet<INamedTypeSymbol>(SymbolEqualityComparer.Default); ImmutableArray<INamedTypeSymbol> => _httpClientTypeSymbols.ToImmutableArray(); symbol.GlobalNamespace.Accept( (namespaceOrTypeSymbol symbol.GetMembers()) namespaceOrTypeSymbol.Accept( (symbol.DeclaredAccessibility != Accessibility.Public) (symbol.GetAttributes().Any(x => x.AttributeClass!.ToDisplayString() == _httpClientTypeSymbols.Add(symbol); nestedTypes = symbol.GetMembers(); (nestedTypes.IsDefaultOrEmpty) (nestedType nestedTypes) nestedType.Accept( (!(context.SyntaxContextReceiver HttpClientSyntax receiver)) httpClientVisitor = HttpClientVisitor(); (assemblySymbol context.Compilation.SourceModule.ReferencedAssemblySymbols .Where(x => x.Identity.PublicKey == ImmutableArray< assemblySymbol.Accept(httpClientVisitor); receiver.TypeSymbols.AddRange(httpClientVisitor.GetHttpClientTypes()); ... [ id, CancellationToken cancellationToken = [ [ [ id, Todo todo, CancellationToken cancellationToken); [ id, CancellationToken cancellationToken); IJsonServerApi _jsonServerApi; _jsonServerApi = jsonServerApi; [ Task<Todo> id, CancellationToken cancellationToken) _jsonServerApi.Get(id, cancellationToken); ...

7 总结

Source generators 非常强(Powerful!!!)，以一种现代化的，人类可读(human readable)的方式解决重复编码的问题，并且拥有与原生代码一致的性能，读者可以结合文章以及官方示例用 Source generators 来解决实际工作中的问题，任何建议和新功能需求也欢迎留言或在 Github 上提出。

源代码&Nuget包

SourceCode: https://github.com/huiyuanai709/SourceGeneratorPower 

Nuget Package: https://www.nuget.org/packages/SourceGeneratorPower.HttpClient.Abstractions 

Nuget Package: https://www.nuget.org/packages/SourceGeneratorPower.HttpClient.SourceGenerator