我创建了一个新的 .NET Core 项目并安装了 GraphQL、GraphiQL 和 GraphQL.SystemTextJson 包。
运行应用程序时,这就是我得到的
除了异常消息之外,GraphiQL 无法找到架构文档。
首先,我有两个实体,用户和任务。
public sealed class User
{
public Guid Id { get; set; }
}
public sealed class Task
{
public Guid Id { get; set; }
}
并且它们都有自己的表示图类型public sealed class UserType : ObjectGraphType<User>
{
public UserType()
{
Name = nameof(User);
Field(user => user.Id).Description("The user id.");
}
}
public sealed class TaskType : ObjectGraphType<Task>
{
public TaskType()
{
Name = nameof(Task);
Field(task => task.Id).Description("The task id.");
}
}
我创建了包含客户端可以执行的所有“操作”的查询public sealed class GraphQLQuery : ObjectGraphType
{
private readonly List<User> _users = new List<User>();
private readonly List<Task> _tasks = new List<Task>();
public GraphQLQuery()
{
Field<ListGraphType<UserType>>(
"users",
"Returns a collection of users.",
resolve: context => _users);
Field<ListGraphType<TaskType>>(
"tasks",
"Returns a collection of tasks.",
resolve: context => _tasks);
}
}
并为架构注册该查询public sealed class GraphQLSchema : GraphQL.Types.Schema
{
public GraphQLSchema(GraphQLQuery graphQLQuery, IServiceProvider serviceProvider) : base(serviceProvider)
{
Query = graphQLQuery;
}
}
在启动文件中ConfigureServices
在调用 services.AddControllers()
之前,我添加了此代码以注册所有必需的服务serviceCollection
.AddSingleton<IDocumentExecuter, DocumentExecuter>()
.AddSingleton<IDocumentWriter, DocumentWriter>()
.AddSingleton<ISchema, GraphQLSchema>()
.AddSingleton<GraphQLQuery>()
并在 Configure
我调用的方法 app.UseGraphiQl()
首先。对应的GraphQL请求DTO
public sealed class GraphQLRequest
{
public string OperationName { get; set; }
public string Query { get; set; }
[JsonConverter(typeof(ObjectDictionaryConverter))]
public Dictionary<string, object> Variables { get; set; }
}
最后我实现了 API Controller [ApiController]
[Route("[controller]")]
public sealed class GraphQLController : Controller
{
private readonly ISchema _schema;
private readonly IDocumentExecuter _documentExecuter;
public GraphQLController(ISchema schema, IDocumentExecuter documentExecuter)
{
_schema = schema;
_documentExecuter = documentExecuter;
}
public async Task<IActionResult> Post([FromBody] GraphQLRequest graphQlRequest)
{
ExecutionOptions executionOptions = new ExecutionOptions()
{
Schema = _schema,
Query = graphQlRequest.Query,
Inputs = graphQlRequest.Variables?.ToInputs()
};
ExecutionResult executionResult = await _documentExecuter.ExecuteAsync(executionOptions);
if (executionResult.Errors != null)
return BadRequest(executionResult);
return Ok(executionResult);
}
}
有人知道这里出了什么问题吗?我看不到循环依赖等问题。运行应用程序时
graphQlRequest
包含以下值.
query IntrospectionQuery {
__schema {
queryType { name }
mutationType { name }
subscriptionType { name }
types {
...FullType
}
directives {
name
description
locations
args {
...InputValue
}
}
}
}
fragment FullType on __Type {
kind
name
description
fields(includeDeprecated: true) {
name
description
args {
...InputValue
}
type {
...TypeRef
}
isDeprecated
deprecationReason
}
inputFields {
...InputValue
}
interfaces {
...TypeRef
}
enumValues(includeDeprecated: true) {
name
description
isDeprecated
deprecationReason
}
possibleTypes {
...TypeRef
}
}
fragment InputValue on __InputValue {
name
description
type { ...TypeRef }
defaultValue
}
fragment TypeRef on __Type {
kind
name
ofType {
kind
name
ofType {
kind
name
ofType {
kind
name
ofType {
kind
name
ofType {
kind
name
ofType {
kind
name
ofType {
kind
name
}
}
}
}
}
}
}
}
我现在迁移到 .NET 5 并收到此错误
我添加了一个复制存储库
https://github.com/olaf-svenson/graphql-net-reproduction
最佳答案
您在 .Net 5 中的错误与未注册的图形类型有关。如果您在调试设置中启用所有异常并禁用“仅我的代码”,您将看到此错误
System.InvalidOperationException: 'Required service for type API.GraphTypes.UserType not found'
This exception was originally thrown at this call stack:
GraphQL.Utilities.ServiceProviderExtensions.GetRequiredService(System.IServiceProvider, System.Type) in ServiceProviderExtensions.cs
GraphQL.Types.Schema.CreateTypesLookup.AnonymousMethod__68_1(System.Type) in Schema.cs
GraphQL.Types.GraphTypesLookup.Create.AnonymousMethod__0(System.Type) in GraphTypesLookup.cs
GraphQL.Types.GraphTypesLookup.AddTypeIfNotRegistered(System.Type, GraphQL.Types.TypeCollectionContext) in GraphTypesLookup.cs
GraphQL.Types.GraphTypesLookup.HandleField(GraphQL.Types.IComplexGraphType, GraphQL.Types.FieldType, GraphQL.Types.TypeCollectionContext, bool) in GraphTypesLookup.cs
GraphQL.Types.GraphTypesLookup.AddType(GraphQL.Types.IGraphType, GraphQL.Types.TypeCollectionContext) in GraphTypesLookup.cs
GraphQL.Types.GraphTypesLookup.Create(System.Collections.Generic.IEnumerable<GraphQL.Types.IGraphType>, System.Collections.Generic.IEnumerable<GraphQL.Types.DirectiveGraphType>, System.Func<System.Type, GraphQL.Types.IGraphType>, GraphQL.Conversion.INameConverter, bool) in GraphTypesLookup.cs
GraphQL.Types.Schema.CreateTypesLookup() in Schema.cs
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
添加 UserType
和 TaskType
to DI 容器解决了这个错误。现在,您原来的问题是:您应该使用
IDocumentWriter
要编写响应,您不能只是序列化 executionResult
通过返回 Ok(executionResult)
.使用此代码编写响应(从官方 graphql-dotnet/examples repo 中窃取):
private async Task WriteResponseAsync(HttpContext context, ExecutionResult result)
{
context.Response.ContentType = "application/json";
context.Response.StatusCode = result.Errors?.Any() == true ? (int)HttpStatusCode.BadRequest : (int)HttpStatusCode.OK;
await _documentWriter.WriteAsync(context.Response.Body, result);
}
已更新 GraphQLController.cs
[ApiController]
[Route("[controller]")]
public sealed class GraphQLController : Controller
{
private readonly ISchema _schema;
private readonly IDocumentExecuter _documentExecuter;
private readonly IDocumentWriter _documentWriter;
public GraphQLController(ISchema schema, IDocumentExecuter documentExecuter, IDocumentWriter documentWriter)
{
_schema = schema;
_documentExecuter = documentExecuter;
_documentWriter = documentWriter;
}
public async Task Post([FromBody] GraphQLRequest graphQlRequest)
{
ExecutionOptions executionOptions = new ExecutionOptions()
{
Schema = _schema,
Query = graphQlRequest.Query,
Inputs = graphQlRequest.Variables?.ToInputs()
};
ExecutionResult executionResult = await _documentExecuter.ExecuteAsync(executionOptions);
await WriteResponseAsync(HttpContext, executionResult);
}
private async Task WriteResponseAsync(HttpContext context, ExecutionResult result)
{
context.Response.ContentType = "application/json";
context.Response.StatusCode = result.Errors?.Any() == true ? (int)HttpStatusCode.BadRequest : (int)HttpStatusCode.OK;
await _documentWriter.WriteAsync(context.Response.Body, result);
}
}
关于c# - GraphQL 模型在 System.Text.Json.JsonException 中挣扎,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/65509530/