c# - 如何在 C# 中使用 Graph Client 将对象传递给 GraphQL 突变

Question

我已经实现了一个mutationin C#，我可以从中调用它，insomnia但是使用我的类型查询相同的问题GraphQLHttpClient 被定义为

public class CheckOutType : ObjectGraphType 
{
        public CheckOutType(ICheckOutTypeService checkOutTypeService)
        {
            Field<NonNullGraphType<StringGraphType>>("EmailId");
            Field<NonNullGraphType<StringGraphType>>("ClientCode");
        }
}
public class CheckOutInputType : InputObjectGraphType 
{
    public CheckOutInputType(ICheckOutTypeService checkOutTypeService)
    {
        Field<NonNullGraphType<StringGraphType>>("EmailId");
        Field<NonNullGraphType<StringGraphType>>("ClientCode");
    }
}

突变定义为

 public class CheckOutMutation : ObjectGraphType
{
    public CheckOutMutation(ICheckOutTypeService checkOutTypeService)
    {
        Field<CheckOutType>(
          "VRCheckOut",
          arguments: new QueryArguments(
            new QueryArgument<NonNullGraphType<CheckOutInputType>> { Name = "CheckOutEntries" }
          ),
          resolve: context =>
          {
              var checkOutData = context.GetArgument<CheckOut>("CheckOutEntries");
              // some statement
              return checkOutData;
          });
    }
}

这在失眠症中效果很好。参考是- 失眠有效的回应

但是，当我尝试在 C# 中调用相同的突变时，GraphQLHttpClient它会返回一条错误消息，因为GraphQL.Validation.InvalidVariableError: Variable '$CheckOutInput' is invalid。没有为非空变量提供值。 下面是我用来调用突变的代码

string query = @"mutation CheckOutMutation($CheckOutInput:CheckOutInputType!)
                            {
                              checkOutMutation
                              {
                                vRCheckOut(checkOutEntries: $CheckOutInput)
                                {
                                  emailId
                                  clientCode 
                                }
                              }
                            }";
            
               GraphQLRequest queryObject = new GraphQLRequest()
            {
                Query = query,
                Variables = new {  emailId = "john@email.com",
                clientCode = "ACC101" }
                
            };
            var client = new GraphQLHttpClient(ConfigSettings.BaseAPIUrl, new NewtonsoftJsonSerializer());
            var response = client.SendMutationAsync<dynamic>(queryObject).Result;

您能否指导/提示，这其中缺少什么？