RestSharp在ASP.NET WebForm返回Null，控制台正常问题解决

我用Visual Studio 2019开发了一个.NET Core控制台程序，通过RestSharp发起POST请求可以正常获取数据并写入SQL Server，但把相同代码移植到ASP.NET WebForms项目（基于.NET Framework）时，却收到了Null响应，完全无法获取数据，恳请大家帮忙排查问题！

控制台程序（正常运行）代码： #

using RestSharp;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using System.Data;
using System.Data.SqlClient;

namespace RetailerUrlStatusChecker
{
    public class Program
    {
        static async Task Main(string[] args)
        {
            await ProcessRepositories();
        }
        private static async Task ProcessRepositories()
        {
            var client = new RestClient("https://api-developer.com/products");
            client.Timeout = -1;
            var request = new RestRequest(Method.POST);
            request.AddHeader("Content-Type", "application/json");
            request.AddHeader("Accept", "application/json");
            request.AddParameter("application/json", "{\"category\": \"all\"}", ParameterType.RequestBody);
            var response2 = await client.ExecuteTaskAsync<List>(request);
            List products= response2.Data;
            //INSERT DATA INTO DB SQL SERVER
            string connectionString = "Data Source=utente-pc\\SQLEXPRESS;Initial Catalog=MYDB;Persist Security Info=True;User ID=user;Password=sa";
            SqlConnection connection = new SqlConnection(connectionString);
            try
            {
                SqlCommand cmd = new SqlCommand("INSERT INTO PRODUCT (code, name, description) VALUES (@code, @name, @description)", connection);
                cmd.Parameters.AddWithValue("@code", products.code);
                cmd.Parameters.AddWithValue("@name", products.name);
                cmd.Parameters.AddWithValue("@description", products.description);
                connection.Open();
                cmd.ExecuteNonQuery();
            }
            catch
            {
                //Label4.Text = "uh oh";
            }
        }
    }
    public class List
    {
        public string code{ get; set; }
        public string name{ get; set; }
        public string description{ get; set; }
    }
}

ASP.NET WebForms（返回Null）代码： #

我已经在<%@ Page指令中设置了Async="true"，代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using RestSharp;
using System.Data;
using System.Data.SqlClient;
using System.Threading.Tasks;

namespace WebApplication2
{
    public partial class _Default : Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            RegisterAsyncTask(new PageAsyncTask(GetGizmosSvcAsync));
        }
        public async Task GetGizmosSvcAsync()
        {
            var client = new RestClient("https://api-developer.com/products");
            client.Timeout = -1;
            var request = new RestRequest(Method.POST);
            request.AddHeader("Content-Type", "application/json");
            request.AddHeader("Accept", "application/json");
            request.AddParameter("application/json", "{\"category\": \"all\"}", ParameterType.RequestBody);
            var response2 = await client.ExecuteTaskAsync<List>(request);
            List products= response2.Data;
            //INSERT DATA INTO DB SQL SERVER
            string connectionString = "Data Source=utente-pc\\SQLEXPRESS;Initial Catalog=MYDB;Persist Security Info=True;User ID=user;Password=sa";
            SqlConnection connection = new SqlConnection(connectionString);
            try
            {
                SqlCommand cmd = new SqlCommand("INSERT INTO PRODUCT (code, name, description) VALUES (@code, @name, @description)", connection);
                cmd.Parameters.AddWithValue("@code", products.code);
                cmd.Parameters.AddWithValue("@name", products.name);
                cmd.Parameters.AddWithValue("@description", products.description);
                connection.Open();
                cmd.ExecuteNonQuery();
            }
            catch
            {
                //Label4.Text = "uh oh";
            }
        }
    }
    public class List
    {
        public string code{ get; set; }
        public string name{ get; set; }
        public string description{ get; set; }
    }
}

API响应Schema： #

{
 "code": { "type": "string" },
 "name": { "type": "string" },
 "description": { "type": "string" }
}

更新：问题已解决！ #

我在论坛上了解到新版RestSharp和.NET Framework存在兼容性问题。仔细对比后发现，我的控制台程序用的是.NET Core，而WebForms项目用的是.NET Framework，两者的NuGet包环境有差异。

于是我重新创建了WebForms项目，安装了RestSharp v106.1.0版本（之前用的是v106.10.1），现在代码可以正常运行了！原来代码本身没有问题，问题出在RestSharp的版本兼容性上。

感谢大家的帮助，给大家添麻烦了！

内容的提问来源于stack exchange，提问作者Simone