c# - 无法从程序集 'GraphQL.Http.IDocumentWriter' 加载类型 'GraphQL, Version=3.0.0.0, Culture=neutral, PublicKeyToken=null'

Question

到达 services.AddGraphQL 时发生错误.
我尝试降级 GraphQL to 2.4 的版本但随后 FuncServiceProvider停止工作。
这是我所拥有的:MarketScheme.cs

public class MarketScheme : Schema
{
   public MarketScheme(IServiceProvider provider) : base(provider)
   {
        Query = provider.GetRequiredService<AppQuery>();
   }
}

Startup.cs

public void ConfigureServices(IServiceCollection services)
{
    services.AddDbContext<marketContext>();

    services.AddScoped<IMarketRepository, MarketRepository>();

    services.AddScoped<IProductRepository, ProductRepository>();

    services.AddScoped<IServiceProvider>(provider => new FuncServiceProvider(provider.GetRequiredService));

    services.AddScoped<MarketScheme>();

    services.AddGraphQL(options =>
    {
        options.ExposeExceptions = true;
        options.EnableMetrics = true;
    }).AddGraphTypes(ServiceLifetime.Scoped);

    services.AddControllers();
}

Answer 1

这有两个部分。

界面GraphQL.Http.IDocumentWriter移至 GraphQL.IDocumentWriter .

JSON 序列化被提取到两个不同的库中，GraphQL.NewtonsoftJson和 GraphQL.SystemTextJson .

如果您使用的是 server项目，您将需要 update to 4.x.
See the 2.x to 3.0 upgrade guide如果您编写了自己的中间件。
Newtonsoft.Json 示例

using Newtonsoft.Json;

private static async Task ExecuteAsync(HttpContext context, ISchema schema)
{
    GraphQLRequest request;
    using (var reader = new StreamReader(context.Request.Body))
    using (var jsonReader = new JsonTextReader(reader))
    {
        var ser = new JsonSerializer();
        request = ser.Deserialize<GraphQLRequest>(jsonReader);
    }

    var executer = new DocumentExecuter();
    var result = await executer.ExecuteAsync(options =>
    {
        options.Schema = schema;
        options.Query = request.Query;
        options.OperationName = request.OperationName;
        options.Inputs = request.Variables.ToInputs();
    });

    context.Response.ContentType = "application/json";
    context.Response.StatusCode = result.Errors?.Any() == true ? (int)HttpStatusCode.BadRequest : (int)HttpStatusCode.OK;

    var writer = new GraphQL.NewtonsoftJson.DocumentWriter();
    await writer.WriteAsync(context.Response.Body, result);
}

public class GraphQLRequest
{
    public string OperationName { get; set; }
    public string Query { get; set; }
    public Newtonsoft.Json.Linq.JObject Variables { get; set; }
}

System.Text 示例

using System.Text.Json;

private static async Task ExecuteAsync(HttpContext context, ISchema schema)
{
    var request = await JsonSerializer.DeserializeAsync<GraphQLRequest>
    (
        context.Request.Body,
        new JsonSerializerOptions { PropertyNameCaseInsensitive = true }
    );

    var executer = new DocumentExecuter();
    var result = await executer.ExecuteAsync(options =>
    {
        options.Schema = schema;
        options.Query = request.Query;
        options.OperationName = request.OperationName;
        options.Inputs = request.Variables.ToInputs();
    });

    context.Response.ContentType = "application/json";
    context.Response.StatusCode = 200; // OK

    var writer = new GraphQL.SystemTextJson.DocumentWriter();
    await writer.WriteAsync(context.Response.Body, result);
}

public class GraphQLRequest
{
    public string OperationName { get; set; }

    public string Query { get; set; }

    [JsonConverter(typeof(GraphQL.SystemTextJson.ObjectDictionaryConverter))]
    public Dictionary<string, object> Variables { get; set; }
}