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  • C# HttpClient类库

    示例代码:

     1 using System.Net.Http;
     2 using System.Net.Http.Headers;
     3 using System.Threading.Tasks;
     4 
     5 namespace MachineServer
     6 {
     7     public static class HttpHelper
     8     {
     9         public static HttpClient HttpClient { get; set; }
    10 
    11         public static void InitializeClient()
    12         {
    13             //单例模式
    14             if (HttpClient == null)
    15             {
    16                 HttpClient = new HttpClient();
    17             }
    18 
    19             HttpClient.DefaultRequestHeaders.Accept.Clear();
    20             HttpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
    21 
    22             //能解读https类型
    23             //ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
    24         }
    25 
    26         /// <summary>
    27         /// Get方法
    28         /// </summary>
    29         /// <param name="url">目标链接(含参数)</param>
    30         /// <returns>返回的字符串</returns>
    31         public static async Task<string> GetAsync(string url)
    32         {
    33             using (HttpResponseMessage response = await HttpClient.GetAsync(url))
    34             {
    35                 response.EnsureSuccessStatusCode();
    36                 string result = await response.Content.ReadAsStringAsync();
    37                 return result;
    38             }
    39         }
    40 
    41         /// <summary>
    42         /// Post方法
    43         /// </summary>
    44         /// <param name="url">目标链接</param>
    45         /// <param name="json">发送的json格式的参数字符串</param>
    46         /// <returns>返回的字符串</returns>
    47         public static async Task<string> PostAsync(string url, string json)
    48         {
    49             StringContent content = new StringContent(json);
    50             content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
    51 
    52             using (HttpResponseMessage response = await HttpClient.PostAsync(url, content))
    53             {
    54                 response.EnsureSuccessStatusCode();
    55                 string result = await response.Content.ReadAsStringAsync();
    56                 return result;
    57             }
    58         }
    59 
    60         /// <summary>
    61         /// Post方法
    62         /// </summary>
    63         /// <param name="url">目标链接</param>
    64         /// <param name="json">发送的json格式的参数字符串</param>
    65         /// <returns>返回的字符串</returns>
    66         public static async Task<string> PostAsync(string url, HttpContent content)
    67         {
    68             //HttpContent content = new FormUrlEncodedContent(new Dictionary<string, string>()
    69             //       {
    70             //           { "token", token},
    71             //           { "orderNo", orderNo}
    72             //       });
    73             content.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded") { CharSet = "utf-8" };
    74 
    75             using (HttpResponseMessage response = await HttpClient.PostAsync(url, content))
    76             {
    77                 response.EnsureSuccessStatusCode();
    78                 string result = await response.Content.ReadAsStringAsync();
    79                 return result;
    80             }
    81         }
    82     }
    83 }

    Get方法

    get方法传递参数,是将参数及其值直接跟在url后面,以?开始,中间用&间隔,类似:

    string tokenString = await HttpHelper.GetAsync($"https://er.com/Apps/Mes/getToken?appKey=11&nonce=22&timestamp=33&signature=44");

    Post方法

    post方法传递参数有几种形式,需要看HTTP服务端那边支持哪种,客户端用时,需要将Header的ContentType设置正确。

    总结以下三种:

    1. json格式:

    content.Headers.ContentType = new MediaTypeHeaderValue("application/json");

    对应Postman中:

    2. form-data格式:

    content.Headers.Remove("Content-Type");
    content.Headers.TryAddWithoutValidation("Content-Type", "multipart/form-data; boundary=----WebKitFormBoundarypy5dIaqJBcHjn7sv");

    对应Postman中:

    3. x-www-form-urlencoded格式:

    content.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded") { CharSet = "utf-8" };

    对应Postman中:

    已测试Post方法的x-www-form-urlencoded方式使用成功

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  • 原文地址:https://www.cnblogs.com/zwh1993/p/13598154.html
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