当多个程序集中的 GraphQL ObjectGraphTypes 时，依赖注入将不起作用

Question

我在几个项目中定义了几个 GraphQL ObjectGraphType 和查询。所有这些项目都依赖于 asp.net 样板 GraphQL 项目。当我尝试调用任何 graphQL 查询时，它 return 错误 "Castle.MicroKernel.ComponentNotFoundException: "找不到支持该服务的组件。

异常堆栈跟踪

Sample.Types.ProductPagedResultGraphType was found ---> Castle.MicroKernel.ComponentNotFoundException: No component for supporting the service Sample.Types.ProductPagedResultGraphType was found
   at Castle.MicroKernel.DefaultKernel.Castle.MicroKernel.IKernelInternal.Resolve(Type service, Arguments arguments, IReleasePolicy policy, Boolean ignoreParentContext)
   at Castle.Windsor.MsDependencyInjection.ScopedWindsorServiceProvider.GetServiceInternal(Type serviceType, Boolean isOptional) in D:\Github\castle-windsor-ms-adapter\src\Castle.Windsor.MsDependencyInjection\ScopedWindsorServiceProvider.cs:line 55
   at GraphQL.Types.Schema.<CreateTypesLookup>b__56_2(Type type)
   at GraphQL.Types.GraphTypesLookup.AddTypeIfNotRegistered(Type type, TypeCollectionContext context)
   at GraphQL.Types.GraphTypesLookup.HandleField(Type parentType, FieldType field, TypeCollectionContext context)
   at GraphQL.Types.GraphTypesLookup.AddType(IGraphType type, TypeCollectionContext context)
   at GraphQL.Types.GraphTypesLookup.Create(IEnumerable`1 types, IEnumerable`1 directives, Func`2 resolveType, IFieldNameConverter fieldNameConverter)
   at System.Lazy`1.ViaFactory(LazyThreadSafetyMode mode)
   at System.Lazy`1.ExecutionAndPublication(LazyHelper executionAndPublication, Boolean useDefaultConstructor)
   at System.Lazy`1.CreateValue()
   at GraphQL.Types.Schema.get_AllTypes()
   at GraphQL.Instrumentation.FieldMiddlewareBuilder.ApplyTo(ISchema schema)
   at GraphQL.DocumentExecuter.ExecuteAsync(ExecutionOptions options)
   --- End of inner exception stack trace ---

当所有这些查询和 ObjectGraphType 都在 asp.net 样板 GraphQL 项目的 1 个项目中时它起作用。

为了允许在多个项目中使用 GraphQL ObjectGraphType 和查询而不是将所有内容都放在 asp.net 样板 GraphQL 项目中，我进行了以下更改：

我创建了一个新的 QueryContainer (ExtQueryContainer.cs) 来扩展原来的 QueryContainer.cs
为了让新创建的QueryContainer继承原来的QueryContainer，我修改了原来的QueryContainer，去掉了class中的sealed关键字。
我创建了一个新的 GraphQL 架构 (GraphQLSchema.cs)，它引用了新创建的 ExtQueryContainer

ServiceCollectionExtensions.cs（在 asp.net 样板 GraphQL 项目中）

public static class ServiceCollectionExtensions
{
    public static void AddAndConfigureGraphQL(this IServiceCollection services)
    {
        services.AddScoped<IDependencyResolver>(
            x => new FuncDependencyResolver(x.GetRequiredService)
        );

        services
            .AddGraphQL(x => { x.ExposeExceptions = DebugHelper.IsDebug; })
            .AddGraphTypes(ServiceLifetime.Scoped)
            .AddUserContextBuilder(httpContext => httpContext.User)
            .AddDataLoader();
    }
}

ExtQueryContainer.cs

public sealed class ExtQueryContainer : QueryContainer
{
    public QueryContainer(RoleQuery roleQuery, UserQuery userQuery, OrganizationUnitQuery organizationUnitQuery, ProductQuery productQuery)
        : base(roleQuery, userQuery, organizationUnitQuery)
    {
        AddField(productQuery.GetFieldType());
    }
}

GraphQLSchema.cs

public class GraphQLSchema : Schema, ITransientDependency
{
    public GraphQLSchema(IDependencyResolver resolver) : base(resolver)
    {
        Query = resolver.Resolve<ExtQueryContainer>();
    }
}

Answer 1

您需要为每个程序集调用 AddGraphTypes：

var productGraphAssembly = Assembly.GetAssembly(typeof(ProductPagedResultGraphType));

services
    .AddGraphQL(x => { x.ExposeExceptions = DebugHelper.IsDebug; })
    .AddGraphTypes(ServiceLifetime.Scoped) // Assembly.GetCallingAssembly() is implicit
    .AddGraphTypes(productGraphAssembly, ServiceLifetime.Scoped) // Add this
    .AddUserContextBuilder(httpContext => httpContext.User)
    .AddDataLoader();

您可以单独注册 IGraphType 类型：

var assembly = Assembly.GetAssembly(typeof(ProductPagedResultGraphType));

foreach (var type in assembly.GetTypes()
    .Where(x => !x.IsAbstract && typeof(IGraphType).IsAssignableFrom(x)))
{
    services.TryAdd(new ServiceDescriptor(type, type, ServiceLifetime.Scoped));
}

参考：https://github.com/graphql-dotnet/server/blob/3.4/src/Core/GraphQLBuilderExtensions.cs

当多个程序集中的 GraphQL ObjectGraphTypes 时，依赖注入将不起作用

Dependency injection won't work when GraphQL ObjectGraphTypes in multiple assemblies

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