从前慢现在也慢

这个屌丝很懒，什么也没留下！

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C# Http 请求接口 Get / Post_c# http post

作者：从前慢现在也慢 | 2024-03-18 02:09:37

踩

c# http post

一、概述

get 和 post 请求，最早被用来做浏览器与服务器之间交互HTML和表单的通讯协议，后来又被广泛的扩充到接口格式的定义上，到目前为止，get / post 请求依然应用在各大网站中，比如在用户登录时，调用 get / post 请求将用户名、密码传到服务器，由服务器进行判断，是否允许用户登录，再将结果返回给浏览器，这样就实现了登录的功能。在后期的 pc 软件开发中，get / post 请求偶尔也会用到，做为一个程序员，http 协议也是我们必须要学的知识点。

二、创建 Web API

如果你只是想参考 Get Post 请求方法，请跳过当前章节

其实 Get Post 请求不光是 Java、PHP 等语言的专利，C# 也可以实现，下面用 C# 大致演示下 web api 的开发流程。

创建一个 web api 项目，用作后面测试用的接口，关于 Web API 怎么创建项目的，可以参考我之前写的教程：

C# ASP.NET Web Core API (.NET 6.0)_熊思宇的博客-CSDN博客

按上面教程，添加一个 ValuesController 接口后，我这里稍做一些更改

默认：

修改后：

将默认添加的天气预报相关的两个类删除

launchSettings.json 配置如下，在 applicationUrl 这里，你的可能和我的不一样，这个是对外访问的链接，有两个接口，一个是 https，一个是 http，端口号不一样，ip 部分是用来限制登录的，如果开发所有人，就用 0.0.0.0 代替


{
  "$schema": "https://json.schemastore.org/launchsettings.json",
  "iisSettings": {
    "windowsAuthentication": false,
    "anonymousAuthentication": true,
    "iisExpress": {
      "applicationUrl": "http://localhost:10090",
      "sslPort": 44385
    }
  },
  "profiles": {
    "WebApplication1": {
      "commandName": "Project",
      "dotnetRunMessages": true,
      "launchBrowser": false,
      "launchUrl": "swagger",
      "applicationUrl": "https://localhost:7281;http://localhost:5252",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "launchUrl": "swagger",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    }
  }
}

将 ValuesController 代码修改如下


using Microsoft.AspNetCore.Mvc;
 
namespace WebApplication1.Controllers
{
    [ApiController]
    [Route("[controller]")]
    public class ValuesController : ControllerBase
    {
        [HttpGet]
        public IEnumerable<string> Get()
        {
            return new string[] { "value1", "value2" };
        }
 
        [HttpGet("{id}")]
        public string Get(int id)
        {
            return "value";
        }
 
        [HttpPost]
        public string Post([FromForm] string json)
        {
            Console.WriteLine(json);
 
            return "hello, good afternoon";
        }
    }
}

启动项目，接下来用 Postman 进行测试

1. Get 接口

2.Post 接口

返回了对应的结果，就是成功了

三、HttpRequestHelper

新建一个控制台项目，添加一个类 HttpRequestHelper，第一个版本是一些传统的写法，后面我又做了一点优化，优化的版本在本章节的最下面，这两个版本都可以做参考。

HttpRequestHelper 代码


using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
 
/// <summary>
/// http请求
/// </summary>
public class HttpRequestHelper
{
    #region Get
    
    /// <summary>
    /// Get请求
    /// </summary>
    /// <param name="url">请求url</param>
    /// <returns></returns>
    public static string Get(string url)
    {
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
        req.Method = "GET";
        req.Timeout = 3000;
 
        if (req == null || req.GetResponse() == null)
            return string.Empty;
 
        HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
        if (resp == null)
            return string.Empty;
 
        using (Stream stream = resp.GetResponseStream())
        {
            using (StreamReader reader = new StreamReader(stream))
            {
                return reader.ReadToEnd();
            }
        }
    }
 
    /// <summary>
    /// Get请求
    /// </summary>
    /// <param name="url"></param>
    /// <param name="headerKey"></param>
    /// <param name="headerValue"></param>
    /// <returns></returns>
    public static string Get(string url, string headerKey, string headerValue)
    {
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
        req.Method = "GET";
        req.Timeout = 3000;
        req.Headers[headerKey] = headerValue;
 
        if (req == null || req.GetResponse() == null)
            return string.Empty;
 
        HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
        if (resp == null)
            return string.Empty;
 
        using (Stream stream = resp.GetResponseStream())
        {
            using (StreamReader reader = new StreamReader(stream))
            {
                return reader.ReadToEnd();
            }
        }
    }
 
    #endregion
 
    #region Post
 
    /// <summary>
    /// Post请求
    /// </summary>
    /// <param name="url">接口url</param>
    /// <returns></returns>
    public static string Post(string url)
    {
        string result = string.Empty;
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
        req.Method = "POST";
        req.Timeout = 3000;
 
        HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
        Stream stream = resp.GetResponseStream();
        using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
        {
            result = reader.ReadToEnd();
        }
        return result;
    }
 
    /// <summary>
    /// Post请求
    /// </summary>
    /// <param name="url">接口url</param>
    /// <param name="postData"></param>
    /// <returns></returns>
    public static string Post(string url, object postData)
    {
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
        req.Method = "POST";
        req.ContentType = "application/json";
        req.Timeout = 3000;
 
        if (req == null)
            return string.Empty;
 
        byte[] data = Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(postData));
        //注意：无需手动指定长度 (否则可能会报流未处理完就关闭的异常，因为ContentLength时候会比真实post数据长度大)
        //req.ContentLength = data.Length;
        using (Stream reqStream = req.GetRequestStream())
        {
            reqStream.Write(data, 0, data.Length);
        }
 
        HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
        if (resp == null)
            return string.Empty;
 
        using (Stream stream = resp.GetResponseStream())
        {
            using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
            {
                return reader.ReadToEnd();
            }
        }
    }
 
    /// <summary>
    /// Post请求
    /// </summary>
    /// <param name="url">接口url</param>
    /// <param name="dic">参数</param>
    /// <returns></returns>
    public static string Post(string url, Dictionary<string, string> dic)
    {
        string result = string.Empty;
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
        req.Method = "POST";
        req.ContentType = "application/x-www-form-urlencoded";
        req.Timeout = 3000;
 
        StringBuilder builder = new StringBuilder();
        int i = 0;
        foreach (var item in dic)
        {
            if (i > 0)
                builder.Append("&");
            builder.AppendFormat("{0}={1}", item.Key, item.Value);
            i++;
        }
        byte[] data = Encoding.UTF8.GetBytes(builder.ToString());
        req.ContentLength = data.Length;
        using (Stream reqStream = req.GetRequestStream())
        {
            reqStream.Write(data, 0, data.Length);
            reqStream.Close();
        }
 
        HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
        Stream stream = resp.GetResponseStream();
        //获取响应内容
        using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
        {
            result = reader.ReadToEnd();
        }
        return result;
    }
 
    /// <summary>
    /// Post请求（基于raw)
    /// </summary>
    /// <param name="url">接口url</param>
    /// <param name="json">raw的json参数</param>
    /// <returns></returns>
    public static async Task<string> Post(string url, string json)
    {
        using (HttpClient client = new HttpClient())
        {
            using(var content = new StringContent(json, Encoding.UTF8, "application/json"))
            {
                using (HttpResponseMessage response = await client.PostAsync(url, content))
                {
                    if (response.IsSuccessStatusCode)
                    {
                        string responseContent = await response.Content.ReadAsStringAsync();
                        return responseContent;
                    }
                    else
                    {
                        Console.WriteLine("请求失败，状态码：" + response.StatusCode);
                        return null;
                    }
                }
            }
        }
    }
 
    /// <summary>
    /// Post请求
    /// </summary>
    /// <param name="url"></param>
    /// <param name="dic"></param>
    /// <param name="headerKey"></param>
    /// <param name="headerValue"></param>
    /// <returns></returns>
    public static string Post(string url, Dictionary<string, string> dic, string headerKey, string headerValue)
    {
        string result = string.Empty;
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
        req.Method = "POST";
        req.ContentType = "application/x-www-form-urlencoded";
        req.Timeout = 3000;
        req.Headers[headerKey] = headerValue;
 
        StringBuilder builder = new StringBuilder();
        int i = 0;
        foreach (var item in dic)
        {
            if (i > 0)
                builder.Append("&");
            builder.AppendFormat("{0}={1}", item.Key, item.Value);
            i++;
        }
        byte[] data = Encoding.UTF8.GetBytes(builder.ToString());
        req.ContentLength = data.Length;
        using (Stream reqStream = req.GetRequestStream())
        {
            reqStream.Write(data, 0, data.Length);
            reqStream.Close();
        }
 
        HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
        Stream stream = resp.GetResponseStream();
        //获取响应内容
        using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
        {
            result = reader.ReadToEnd();
        }
        return result;
    }
 
    #endregion
}

关于 req.ContentType 的赋值，常见用法的有下面这些


/// <summary>
/// HTTP 内容类型(Content-Type)
/// </summary>
public class HttpContentType
{
    /// <summary>
    /// 资源类型：普通文本
    /// </summary>
    public const string TEXT_PLAIN = "text/plain";
 
    /// <summary>
    /// 资源类型：JSON字符串
    /// </summary>
    public const string APPLICATION_JSON = "application/json";
 
    /// <summary>
    /// 资源类型：未知类型(数据流)
    /// </summary>
    public const string APPLICATION_OCTET_STREAM = "application/octet-stream";
 
    /// <summary>
    /// 资源类型：表单数据(键值对)
    /// </summary>
    public const string WWW_FORM_URLENCODED = "application/x-www-form-urlencoded";
 
    /// <summary>
    /// 资源类型：表单数据(键值对)。编码方式为 gb2312
    /// </summary>
    public const string WWW_FORM_URLENCODED_GB2312 = "application/x-www-form-urlencoded;charset=gb2312";
 
    /// <summary>
    /// 资源类型：表单数据(键值对)。编码方式为 utf-8
    /// </summary>
    public const string WWW_FORM_URLENCODED_UTF8 = "application/x-www-form-urlencoded;charset=utf-8";
 
    /// <summary>
    /// 资源类型：多分部数据
    /// </summary>
    public const string MULTIPART_FORM_DATA = "multipart/form-data";
}

关于 HttpWebRequest，可以参考微软官方文档

HttpWebRequest 类 (System.Net) | Microsoft Learn

2023.10.17 对上面的版本我又进行了优化，有不足的地方欢迎指出


using Newtonsoft.Json;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Text;
 
/// <summary>
/// http请求
/// </summary>
public class HttpRequestHelper
{
    #region Get
 
    /// <summary>
    /// Get请求
    /// </summary>
    /// <param name="url">请求url</param>
    /// <returns></returns>
    public static string Get(string url)
    {
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
        req.Method = "GET";
        req.Timeout = 3000;
 
        if (req == null) return string.Empty;
 
        using (HttpWebResponse resp = (HttpWebResponse)req.GetResponse())
        using (Stream stream = resp.GetResponseStream())
        using (StreamReader reader = new StreamReader(stream))
            return reader.ReadToEnd();
    }
 
    /// <summary>
    /// Get请求
    /// </summary>
    /// <param name="url"></param>
    /// <param name="headerKey"></param>
    /// <param name="headerValue"></param>
    /// <returns></returns>
    public static string Get(string url, string headerKey, string headerValue)
    {
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
        req.Method = "GET";
        req.Timeout = 3000;
        req.Headers[headerKey] = headerValue;
 
        if (req == null) return string.Empty;
 
        using (HttpWebResponse resp = (HttpWebResponse)req.GetResponse())
        using (Stream stream = resp.GetResponseStream())
        using (StreamReader reader = new StreamReader(stream))
            return reader.ReadToEnd();
    }
 
    #endregion
 
    #region Post
 
    /// <summary>
    /// Post请求
    /// </summary>
    /// <param name="url">接口url</param>
    /// <returns></returns>
    public static string Post(string url)
    {
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
        req.Method = "POST";
        req.Timeout = 3000;
 
        if (req == null) return string.Empty;
 
        using (HttpWebResponse resp = (HttpWebResponse)req.GetResponse())
        using (Stream stream = resp.GetResponseStream())
        using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
            return reader.ReadToEnd();
    }
 
    /// <summary>
    /// Post请求
    /// </summary>
    /// <param name="url">接口url</param>
    /// <param name="postData"></param>
    /// <returns></returns>
    public static string Post(string url, object postData)
    {
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
        req.Method = "POST";
        req.ContentType = "application/json";
        req.Timeout = 3000;
 
        if (req == null) return string.Empty;
 
        byte[] data = Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(postData));
        using (Stream reqStream = req.GetRequestStream())
            reqStream.Write(data, 0, data.Length);
        using (HttpWebResponse resp = (HttpWebResponse)req.GetResponse())
        using (Stream stream = resp.GetResponseStream())
        using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
            return reader.ReadToEnd();
    }
 
    /// <summary>
    /// Post请求（基于raw)
    /// </summary>
    /// <param name="url"></param>
    /// <param name="raw"></param>
    /// <returns></returns>
    public static string Post(string url, string raw)
    {
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
        request.Method = "POST";
        request.ContentType = "application/json"; // 设置合适的 Content-Type
        request.Timeout = 3000;
 
        if (request == null) return string.Empty;
 
        byte[] requestBodyBytes = Encoding.UTF8.GetBytes(raw);
        request.ContentLength = requestBodyBytes.Length;
 
        using (Stream requestStream = request.GetRequestStream())
            requestStream.Write(requestBodyBytes, 0, requestBodyBytes.Length);
        using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
        using (Stream responseStream = response.GetResponseStream())
        using (StreamReader reader = new StreamReader(responseStream))
            return reader.ReadToEnd();
    }
 
    /// <summary>
    /// Post请求
    /// </summary>
    /// <param name="url">接口url</param>
    /// <param name="dic">参数</param>
    /// <returns></returns>
    public static string Post(string url, Dictionary<string, string> dic)
    {
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
        req.Method = "POST";
        req.ContentType = "application/x-www-form-urlencoded";
        req.Timeout = 3000;
 
        StringBuilder builder = new StringBuilder();
        int i = 0;
        foreach (var item in dic)
        {
            if (i > 0)
                builder.Append("&");
            builder.AppendFormat("{0}={1}", item.Key, item.Value);
            i++;
        }
        byte[] data = Encoding.UTF8.GetBytes(builder.ToString());
        req.ContentLength = data.Length;
 
        using (Stream reqStream = req.GetRequestStream())
            reqStream.Write(data, 0, data.Length);
        using (HttpWebResponse resp = (HttpWebResponse)req.GetResponse())
        using (Stream stream = resp.GetResponseStream())
        using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
            return reader.ReadToEnd();
    }
 
    /// <summary>
    /// Post请求
    /// </summary>
    /// <param name="url"></param>
    /// <param name="dic"></param>
    /// <param name="headerKey"></param>
    /// <param name="headerValue"></param>
    /// <returns></returns>
    public static string Post(string url, Dictionary<string, string> dic, string headerKey, string headerValue)
    {
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
        req.Method = "POST";
        req.ContentType = "application/x-www-form-urlencoded";
        req.Timeout = 3000;
        req.Headers[headerKey] = headerValue;
 
        StringBuilder builder = new StringBuilder();
        int i = 0;
        foreach (var item in dic)
        {
            if (i > 0)
                builder.Append("&");
            builder.AppendFormat("{0}={1}", item.Key, item.Value);
            i++;
        }
        byte[] data = Encoding.UTF8.GetBytes(builder.ToString());
        req.ContentLength = data.Length;
 
        using (Stream reqStream = req.GetRequestStream())
            reqStream.Write(data, 0, data.Length);
        using (HttpWebResponse resp = (HttpWebResponse)req.GetResponse())
        using (Stream stream = resp.GetResponseStream())
        using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
            return reader.ReadToEnd();
    }
 
    #endregion
}

下面是异步版的，推荐使用这个版本

类名：HttpClientHelper


using System;
using System.Collections.Generic;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
 
public class HttpClientHelper
{
    #region 字段
 
    private static HttpClient HttpClientWrapper = new HttpClient();
 
    private static int TimeOut = 3;
 
    #endregion
 
    #region Get
 
    /// <summary>
    /// Get 请求
    /// </summary>
    /// <param name="url">链接</param>
    /// <returns></returns>
    /// <exception cref="TimeoutException"></exception>
    /// <exception cref="Exception"></exception>
    public static async Task<string> Get(string url)
    {
        var response = await HttpClientWrapper.GetAsync(url);
        response.EnsureSuccessStatusCode();
        return await response.Content.ReadAsStringAsync();
    }
 
    /// <summary>
    /// Get 请求（注意 headerValue 只能单行，不能加入换行符等特殊字符）
    /// </summary>
    /// <param name="url">链接</param>
    /// <param name="headerKey">标题key</param>
    /// <param name="headerValue">标题value</param>
    /// <returns></returns>
    /// <exception cref="TimeoutException"></exception>
    /// <exception cref="Exception"></exception>
    public static async Task<string> Get(string url, string headerKey, string headerValue)
    {
        HttpClientWrapper.DefaultRequestHeaders.Clear();
        HttpClientWrapper.DefaultRequestHeaders.Add(headerKey, headerValue);
 
        var response = await HttpClientWrapper.GetAsync(url);
        response.EnsureSuccessStatusCode();
        return await response.Content.ReadAsStringAsync();
    }
 
    #endregion
 
    #region Post
 
    /// <summary>
    /// Post 请求
    /// </summary>
    /// <param name="url">链接</param>
    /// <param name="content">发送内容</param>
    /// <returns></returns>
    public static async Task<string> Post(string url, string content)
    {
        var httpContent = new StringContent(content, Encoding.UTF8, "application/json");
        var response = await HttpClientWrapper.PostAsync(url, httpContent);
        response.EnsureSuccessStatusCode();
        return await response.Content.ReadAsStringAsync();
    }
 
    /// <summary>
    /// Post 请求（注意 headerValue 只能单行，不能加入换行符等特殊字符）
    /// </summary>
    /// <param name="url">链接</param>
    /// <param name="content">发送内容</param>
    /// <param name="headerKey">标题key</param>
    /// <param name="headerValue">标题value</param>
    /// <returns></returns>
    /// <exception cref="TimeoutException"></exception>
    /// <exception cref="Exception"></exception>
    public static async Task<string> Post(string url, string content, string headerKey, string headerValue)
    {
        HttpClientWrapper.DefaultRequestHeaders.Clear();
        HttpClientWrapper.DefaultRequestHeaders.Add(headerKey, headerValue);
 
        var httpContent = new StringContent(content, Encoding.UTF8, "application/json");
        var response = await HttpClientWrapper.PostAsync(url, httpContent);
        response.EnsureSuccessStatusCode();
        return await response.Content.ReadAsStringAsync();
    }
 
    /// <summary>
    /// Post 请求（注意 headers 参数只能单行，不能加入换行符等特殊字符）
    /// </summary>
    /// <param name="url">链接</param>
    /// <param name="headers">标题</param>
    /// <param name="content">发送内容</param>
    /// <returns></returns>
    /// <exception cref="TimeoutException"></exception>
    /// <exception cref="Exception"></exception>
    public static async Task<string> Post(string url, string content, Dictionary<string, string> headers)
    {
        HttpClientWrapper.DefaultRequestHeaders.Clear();
        foreach (var header in headers)
            HttpClientWrapper.DefaultRequestHeaders.Add(header.Key, header.Value);
 
        var httpContent = new StringContent(content, Encoding.UTF8, "application/json");
        var response = await HttpClientWrapper.PostAsync(url, httpContent);
        response.EnsureSuccessStatusCode();
        return await response.Content.ReadAsStringAsync();
    }
 
    /// <summary>
    /// Post 请求（注意 headers 参数只能单行，不能加入换行符等特殊字符）
    /// </summary>
    /// <param name="url"></param>
    /// <param name="parameters">参数合集</param>
    /// <param name="headers"></param>
    /// <returns></returns>
    /// <exception cref="TimeoutException"></exception>
    /// <exception cref="Exception"></exception>
    public static async Task<string> Post(string url, Dictionary<string, string> parameters, Dictionary<string, string> headers)
    {
        HttpClientWrapper.DefaultRequestHeaders.Clear();
        foreach (var header in headers)
            HttpClientWrapper.DefaultRequestHeaders.Add(header.Key, header.Value);
 
        var formContent = new FormUrlEncodedContent(parameters);
        var response = await HttpClientWrapper.PostAsync(url, formContent);
        response.EnsureSuccessStatusCode();
        return await response.Content.ReadAsStringAsync();
    }
 
    #endregion
 
    #region 构造函数
 
    static HttpClientHelper()
    {
        HttpClientWrapper.Timeout = TimeSpan.FromSeconds(TimeOut);
    }
 
    private HttpClientHelper() { }
 
    #endregion
}

三、测试

1.Get 请求

在 Program 类中添加下面代码


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace HttpTest
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Test();
 
            Console.ReadKey();
        }
 
        static async void Test()
        {
            string url = "http://localhost:5252/Values";
 
            try
            {
                string result = await HttpRequestHelper.Get(url);
                Console.WriteLine(result);
            }
            catch (Exception ex)
            {
                Console.WriteLine("错误：\n{0}", ex.Message);
            }
        }
    }
}

运行：

将地址故意写错，再次执行，就能捕捉到 “无法连接到服务器” 的错误

2.Post 请求

代码：


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace HttpTest
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Test();
 
            Console.ReadKey();
        }
 
        static async void Test()
        {
            string url = "http://localhost:5252/Values";
 
            Dictionary<string, string> dic = new Dictionary<string, string>();
            dic.Add("json", "你好");
 
            try
            {
                string result = await HttpRequestHelper.Post(url, dic);
                Console.WriteLine(result);
            }
            catch (Exception ex)
            {
                Console.WriteLine("错误：\n{0}", ex.Message);
            }
        }
    }
}

运行：

使用 Post 接口需要注意的是，参数的名字必须要和 web api 参数的名字一模一样，比如当前 post 接口的参数名字是 “json”

那么在 dic 添加的键值对，key 也必须是 “json”，如果不是的话，会无法访问到 post 接口

结束

如果这个帖子对你有所帮助，欢迎关注 + 点赞 + 留言，或者你有疑问的话，也可以私信给我。

end

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