C# Winform 通过POST/GET发送获取json数据 存在错误

新建项目

实体类

namespace WindowsFormsApp3
{
    
    
    public class User
    {
    
    
        public int id {
    
     get; set; }
        public string username {
    
     get; set; }
        public string pwd {
    
     get; set; }
        public int auth {
    
     get; set; }

        public User() {
    
     }

        public User(int id, string username, string pwd, int auth)
        {
    
    
            this.id = id;
            this.username = username;
            this.pwd = pwd;
            this.auth = auth;
        }
    }
}

数据库连接 工具类

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

namespace WindowsFormsApp3
{
    
    
    class SqlUtils
    {
    
    
        static string connStr = @"server=LAPTOP-H9JFQJGF\SQLEXPRESS;uid=sa;pwd=123456;database=warehouse";
        static SqlConnection conn = null;
        public static SqlCommand ConnectSql(string sql)
        {
    
    
            try
            {
    
    
                conn = new SqlConnection(connStr);
                conn.Open();
                return new SqlCommand(sql, conn);
            }
            catch (Exception ex)
            {
    
    
                Console.WriteLine(ex);
            }
            return null;
        }

        public static void CloseSql(SqlDataReader sdr)
        {
    
    
            if (sdr != null)
            {
    
    
                sdr.Close();
            }
            conn.Close();
        }
    }
}

POST/GET 工具类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.IO;

namespace WindowsFormsApp3
{
    
    
    class HttpUtils
    {
    
    
        public static string Get(string Url)
        {
    
    
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
            request.Proxy = null;
            request.KeepAlive = false;
            request.Method = "GET";
            request.ContentType = "application/json; charset=UTF-8";
            request.AutomaticDecompression = DecompressionMethods.GZip;

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream myResponseStream = response.GetResponseStream();
            StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.UTF8);
            string retString = myStreamReader.ReadToEnd();

            myStreamReader.Close();
            myResponseStream.Close();

            if (response != null)
            {
    
    
                response.Close();
            }
            if (request != null)
            {
    
    
                request.Abort();
            }
            return retString;
        }

        public static string Post(string Url, string Data,string Referer)
        {
    
    
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
            request.Method = "POST";
            request.Referer = Referer;
            byte[] bytes = Encoding.UTF8.GetBytes(Data);
            request.ContentType = "application / x - www - form - urlencoded";
            request.ContentLength = bytes.Length;
            //request.Headers("Access - Control - Allow - Origin", " * ");
            Stream myResponseStream = request.GetRequestStream();
            myResponseStream.Write(bytes,0,bytes.Length);
            //request.KeepAlive = true;
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            StreamReader myStreamReader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
            string retString = myStreamReader.ReadToEnd();

            myStreamReader.Close();
            myResponseStream.Close();
            if (response != null) {
    
    
                response.Close();
            }
            if (request != null) {
    
    
                request.Abort();
            }
            return retString;
        }
    }
}

App.config配置文件

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
        <sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
            <section name="WindowsFormsApp3.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
        </sectionGroup>
    </configSections>
    <connectionStrings>
        <add name="WindowsFormsApp3.Properties.Settings.warehouseConnectionString"
            connectionString="Data Source=LAPTOP-H9JFQJGF\SQLEXPRESS;Initial Catalog=warehouse;Integrated Security=True"
            providerName="System.Data.SqlClient" />
    </connectionStrings>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
    </startup>
    <applicationSettings>
        <WindowsFormsApp3.Properties.Settings>
            <setting name="WindowsFormsApp3_localhost_WebServiceTest01" serializeAs="String">
                <value>https://localhost:44365/WebServiceTest01.asmx</value>
            </setting>
        </WindowsFormsApp3.Properties.Settings>
    </applicationSettings>
    <system.serviceModel>
        <bindings>
            <basicHttpBinding>
                <binding name="WebServiceTest01Soap">
                    <security mode="Transport" />
                </binding>
                <binding name="WebServiceTest01Soap1" />
            </basicHttpBinding>
        </bindings>
        <client>
            <endpoint address="https://localhost:44365/WebServiceTest01.asmx"
                binding="basicHttpBinding" bindingConfiguration="WebServiceTest01Soap"
                contract="AddService.WebServiceTest01Soap" name="WebServiceTest01Soap" />
        </client>
    </system.serviceModel>

	<!--处理跨域问题 然而没有卵用-->
	<system.webServer>
		<httpProtocol>
			<customHeaders>
				<add name="Access-Control-Allow-Origin" value="*" />
				<add name="Access-Control-Allow-Headers" value="Content-Type" />
				<add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
			</customHeaders>			
		</httpProtocol>		
	</system.webServer>
	<!--<system.web>
		<webServices>
			<protocols>
				<add name="HttpPost"/>
				<add name="HttpGet"/>
			</protocols>
		</webServices>
		<customErrors mode="Off"/>
	</system.web>-->
	<!--<system.net>
		<defaultProxy enabled="false" useDefaultCredentials="false">
			<proxy/>
			<bypasslist/>
			<module/>
		</defaultProxy>
	</system.net>-->
</configuration>

窗体

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp3
{
    
    
    public partial class Form2 : Form
    {
    
    
        public Form2()
        {
    
    
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
    
    
            string url = "http://www.kuaidi100.com/query?type=shunfeng&postid=367847964498";
            //string url = "http://192.168.1.114:8081/user";
            string getJson = HttpUtils.Get(url);
            MessageBox.Show(getJson);
        }

        private void button2_Click(object sender, EventArgs e)
        {
    
    
            // 测试用路径
            string url = "http://www.kuaidi100.com/query?type=shunfeng&postid=367847964498";

            string getJson = HttpUtils.Get(url);

            Root rt = JsonConvert.DeserializeObject<Root>(getJson);
            MessageBox.Show("com="+rt.com+"\r\n"+"condition="+rt.condition+"\r\n"+"ischeck="+rt.ischeck+"\r\n"+//
                "state="+rt.state+"\r\n"+"status="+rt.status);

            for (int i = 0; i < rt.data.Count; i++) {
    
    
                MessageBox.Show("Data="+rt.data[i].context+"\r\n"+rt.data[i].location+"\r\n"+rt.data[i].time+"\r\n"+rt.data[i].ftime);
            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
    
    
            
            string json = JsonConvert.SerializeObject(UserList());
            MessageBox.Show(json);
        }

        private void button4_Click(object sender, EventArgs e)
        {
    
    
            // 获取数据的路径：http://localhost:8081/user
            HttpUtils.Post("http://localhost:8081/user",JsonConvert.SerializeObject(UserList()), "Access - Control - Allow - Origin");
            MessageBox.Show("ok");
        }

        // 获取对象集合
        private List<User> UserList()
        {
    
    
            List<User> userList = new List<User>();
            User user = null;
            string sql = "select * from user_table";
            SqlCommand cmd = SqlUtils.ConnectSql(sql);
            SqlDataReader sdr = cmd.ExecuteReader();
            while (sdr.Read())
            {
    
    
                user = new User(sdr.GetInt32(0), sdr.GetString(1), sdr.GetString(2), sdr.GetInt32(3));
                userList.Add(user);
            }
            return userList;
        }
    }
}

测试效果

button_3 将User对象转换为json格式

button_4 将json数据发送到服务器 报错