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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，它返回错误“Castle.MicroKernel.ComponentNotFoundException：“未找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 1 个项目中时，它可以工作，该项目是 asp.net 样板 GraphQL 项目。

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

  1. 我创建了一个新的 QueryContainer (ExtQueryContainer.cs) 来扩展原来的 QueryContainer.cs
  2. 我通过从类中删除sealed 关键字来修改原始QueryContainer，以便允许新创建的QueryContainer 继承原始QueryContainer。
  3. 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>();
    }
}
4

1 回答 1

3

您需要AddGraphTypes为每个程序集调用：

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IGraphType单独注册类型：

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

于 2019-12-17T13:58:16.260 回答