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

Question

当它到达时发生错误services.AddGraphQL。

我尝试将GraphQL 的版本降级到 2.4，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。

1. 界面GraphQL.Http.IDocumentWriter移至GraphQL.IDocumentWriter.
2. JSON 序列化被提取到两个不同的库中，GraphQL.NewtonsoftJson和GraphQL.SystemTextJson。

如果您使用的是服务器项目，则需要更新到 4.x。

如果您编写了自己的中间件，请参阅 2.x 到 3.0 升级指南。

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; }
}