Schema First .NET Graphql 无法解析 MVE

Question

运行 ASP.NET Core 7.0。 & GraphQL 7.6.1.

我正在尝试使用 GraphQL.NET 创建模式优先 GraphQL 的最小可行示例，但查询无法解析。 GraphQL 在控制台中解析，但不在 API 中解析，因此可能是 DI 问题...

我不断收到消息

尝试解析字段“用户”时出错

架构

type Query {
  user: User
}

type User {
  id: String!
  name: String!
}

用户.cs

public class User
{
    public string Id { get; set; } = string.Empty;
    public string Name { get; set; } = string.Empty;
}

public class Query
{
    [GraphQLMetadata("user")]
    public User GetUser()
    {
        return new User { Id = "1", Name = "Simpleton" };
    }
}

程序.cs

// Get the schema information 
FileInfo fileInfo = new(Path.Join(AppContext.BaseDirectory, "schema.gql"));
var schemaText = await GetSchema(fileInfo);
var schema = Schema.For(schemaText,
  sb =>
  {
      sb.Types.Include<Query>();
  });

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddGraphQL(b => b
    .AddSchema(schema)  // schema
    .AddSystemTextJson());  // serializer

builder.Services.AddSingleton<IDataService, DataService>();
builder.Services.AddLogging(b => b.AddConsole());

var app = builder.Build();

if (app.Environment.IsDevelopment())
{
    app.UseDeveloperExceptionPage();
    app.UseGraphQLPlayground();
}

app.UseGraphQL("/graphql");  // url to host GraphQL endpoint

await app.RunAsync();

Answer 1

简单修复，只需将属性查询类注册为服务即可：

builder.Services.AddSingleton<Query>();