cs端调用webApi

 1 public class Httphelper
 2     {
 3         public static string Post1(string url, string postString)
 4         {
 5             
 6             using (WebClient webClient = new WebClient())
 7             {
 8                 byte[] postData = Encoding.UTF8.GetBytes(postString);//编码，
 9                 webClient.Headers.Add("Content-Type", "application/json");//采取POST方式必须加的header，如果改为GET方式的话就去掉这句话即可  
10                 byte[] responseData = webClient.UploadData(url, "POST", postData);//得到返回字符流  
11                 string srcString = Encoding.UTF8.GetString(responseData);//解码  
12                 return srcString;
13             }
14         }
15 
16         public static string Post(string url, string postData)
17         {
18             string result = "";
19 
20             HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
21 
22             req.Method = "POST";
23 
24            
25 
26             req.ContentType = "application/json";
27 
28             byte[] data = Encoding.UTF8.GetBytes(postData);
29 
30             req.ContentLength = data.Length;
31             //req.Timeout = 30000;
32             using (Stream reqStream = req.GetRequestStream())
33             {
34                 reqStream.Write(data, 0, data.Length);
35 
36                 reqStream.Close();
37             }
38 
39             HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
40 
41             Stream stream = resp.GetResponseStream();
42 
43             //获取响应内容
44             using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
45             {
46                 result = reader.ReadToEnd();
47             }
48            
49             return result;
50         }
51     }

HttpClient 调用

 1  /// <summary>
 2         /// post 同步
 3         /// </summary>
 4         /// <param name="url"></param>
 5         /// <param name="postString"></param>
 6         /// <returns></returns>
 7         public static string Post(string url, string postData)
 8         {
 9             try
10             {
11                 using (HttpClient _httpClient = new HttpClient())
12                 {
13                     StringContent httpClient = new StringContent(postData, Encoding.UTF8, "application/json");
14                     var response = _httpClient.PostAsync(url, httpClient).Result;
15                     string jsonstr = response.Content.ReadAsStringAsync().Result;
16                     return jsonstr;
17                 }
18             }
19             catch (Exception ex)
20             {
21                 _logger.LogError(string.Format("Api调用异常--url【{0}】,参数【{1}】", url, postData), ex);
22                 return "";
23             }
24         }
25         /// <summary>
26         /// post 异步
27         /// </summary>
28         /// <param name="url"></param>
29         /// <param name="postData"></param>
30         /// <returns></returns>
31         public static async void PostAsync(string url, string postData)
32         {
33             try
34             {
35                 using (HttpClient _httpClient = new HttpClient())
36                 {
37                     StringContent httpClient = new StringContent(postData, Encoding.UTF8, "application/json");
38                     var response = await _httpClient.PostAsync(url, httpClient);
39                     string jsonstr = await response.Content.ReadAsStringAsync();
40                 }
41             }
42             catch (Exception ex)
43             {
44                 _logger.LogError(string.Format("Api调用异常--url【{0}】,参数【{1}】", url, postData), ex);
45             }
46         }