C# 请求在线接口数据

淡淡的烟草味﹌ 2021-12-05 21:55 251阅读 0赞

请求后台，有很多方式，常见的有WebRequest、HttpClient。以下mark一上~

### WebRequest方式 ###

1. Get

1     public static async Task<string> RequestDataAsync(string requestUrl)
     2     {
     3         WebRequest translationWebRequest = WebRequest.Create(requestUrl);
     4 
     5         var response = await translationWebRequest.GetResponseAsync();
     6 
     7         using (Stream stream = response.GetResponseStream())
     8         {
     9             using (StreamReader reader = new StreamReader(stream ?? throw new InvalidOperationException(),
    10                 Encoding.GetEncoding("utf-8")))
    11             {
    12                 string result = reader.ReadToEnd();
    13                 var decodeResult = Unicode2String(result);
    14                 return decodeResult;
    15             }
    16         }
    17     }

2. Post

1     /// <summary>
     2     /// Post using WebRequest
     3     /// </summary>
     4     /// <param name="requestUrl"></param>
     5     /// <param name="jsonData"></param>
     6     /// <returns></returns>
     7     public static async Task<string> PostDataAsync(string requestUrl,string jsonData)
     8     {
     9         WebRequest translationWebRequest = WebRequest.Create(requestUrl);
    10         translationWebRequest.Method = "post";
    11         translationWebRequest.ContentType = "application/json";
    12 
    13         byte[] postdatabyte = Encoding.UTF8.GetBytes(jsonData);
    14         translationWebRequest.ContentLength = postdatabyte.Length;
    15         using (Stream postStream= translationWebRequest.GetRequestStream())
    16         {
    17             postStream.Write(postdatabyte, 0, postdatabyte.Length);
    18         }
    19 
    20         var response = await translationWebRequest.GetResponseAsync();
    21 
    22         using (Stream responseStream = response.GetResponseStream())
    23         {
    24             using (StreamReader reader = new StreamReader(responseStream ?? throw new InvalidOperationException(),
    25                 Encoding.GetEncoding("utf-8")))
    26             {
    27                 string result = reader.ReadToEnd();
    28                 var decodeResult = Unicode2String(result);
    29                 return decodeResult;
    30             }
    31         }
    32     }

### HttpClient方式 ###

1     /// <summary>
     2     /// Post using HttpClient
     3     /// </summary>
     4     /// <param name="requestUrl"></param>
     5     /// <param name="jsonData"></param>
     6     /// <returns></returns>
     7     public static async Task<string> PostDataUsingHttpAsync(string requestUrl, string jsonData)
     8     {
     9         HttpContent httpContent = new StringContent(jsonData);
    10         httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
    11         HttpClient httpClient = new HttpClient();
    12         HttpResponseMessage response = httpClient.PostAsync(requestUrl, httpContent).Result;
    13         if (response.IsSuccessStatusCode)
    14         {
    15             Task<string> t = response.Content.ReadAsStringAsync();
    16             return t.Result;
    17         }
    18         return string.Empty;
    19     }

拿走，不谢~

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1     public class WebRequestBase
     2     {
     3         public static async Task<string> RequestDataAsync(string requestUrl)
     4         {
     5             WebRequest translationWebRequest = WebRequest.Create(requestUrl);
     6 
     7             var response = await translationWebRequest.GetResponseAsync();
     8 
     9             using (Stream stream = response.GetResponseStream())
    10             {
    11                 using (StreamReader reader = new StreamReader(stream ?? throw new InvalidOperationException(),
    12                     Encoding.GetEncoding("utf-8")))
    13                 {
    14                     string result = reader.ReadToEnd();
    15                     var decodeResult = Unicode2String(result);
    16                     return decodeResult;
    17                 }
    18             }
    19         }
    20 
    21         /// <summary>
    22         /// Post using WebRequest
    23         /// </summary>
    24         /// <param name="requestUrl"></param>
    25         /// <param name="jsonData"></param>
    26         /// <returns></returns>
    27         public static async Task<string> PostDataAsync(string requestUrl, string jsonData)
    28         {
    29             WebRequest translationWebRequest = WebRequest.Create(requestUrl);
    30             translationWebRequest.Method = "post";
    31             translationWebRequest.ContentType = "application/json";
    32 
    33             byte[] postdatabyte = Encoding.UTF8.GetBytes(jsonData);
    34             translationWebRequest.ContentLength = postdatabyte.Length;
    35             using (Stream postStream = translationWebRequest.GetRequestStream())
    36             {
    37                 postStream.Write(postdatabyte, 0, postdatabyte.Length);
    38             }
    39 
    40             var response = await translationWebRequest.GetResponseAsync();
    41 
    42             using (Stream responseStream = response.GetResponseStream())
    43             {
    44                 using (StreamReader reader = new StreamReader(responseStream ?? throw new InvalidOperationException(),
    45                     Encoding.GetEncoding("utf-8")))
    46                 {
    47                     string result = reader.ReadToEnd();
    48                     var decodeResult = Unicode2String(result);
    49                     return decodeResult;
    50                 }
    51             }
    52         }
    53 
    54         /// <summary>
    55         /// Post using HttpClient
    56         /// </summary>
    57         /// <param name="requestUrl"></param>
    58         /// <param name="jsonData"></param>
    59         /// <returns></returns>
    60         public static async Task<string> PostDataUsingHttpAsync(string requestUrl, string jsonData)
    61         {
    62             HttpContent httpContent = new StringContent(jsonData);
    63             httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
    64             HttpClient httpClient = new HttpClient();
    65             HttpResponseMessage response = httpClient.PostAsync(requestUrl, httpContent).Result;
    66             if (response.IsSuccessStatusCode)
    67             {
    68                 Task<string> t = response.Content.ReadAsStringAsync();
    69                 return t.Result;
    70             }
    71             return string.Empty;
    72         }
    73 
    74         /// <summary>
    75         /// Unicode转字符串
    76         /// </summary>
    77         /// <param name="source">经过Unicode编码的字符串</param>
    78         /// <returns>正常字符串</returns>
    79         protected static string Unicode2String(string source)
    80         {
    81             return new Regex(@"\\u([0-9A-F]{4})", RegexOptions.IgnoreCase | RegexOptions.Compiled).Replace(
    82                 source, x => string.Empty + Convert.ToChar(Convert.ToUInt16(x.Result("$1"), 16)));
    83         }
    84     }

转载于:https://www.cnblogs.com/kybs0/p/11131012.html

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