1       
 2        /// <summary>
 3         /// 向服务器发送post请求(修改头像)
 4         /// </summary>
 5         /// <param name="url">路径</param>
 6         /// <returns></returns>
 7         public async static Task<string> SendPostRequest(string url)
 8         {
 9             try
10             {
11                 Dictionary<string, object> dic = new Dictionary<string, object>();
12                 dic.Add("GWnumber", setHeadPicture.GWnumber);
13                 dic.Add("token", setHeadPicture.Token);
14                 dic.Add("file", setHeadPicture.File);//file值是StorageFile类型
15                 dic.Add("systemType", setHeadPicture.SystemType);
16 
17                 HttpMultipartFormDataContent form = new HttpMultipartFormDataContent();
18                 foreach (KeyValuePair<string, object> item in dic)
19                 {
20                     if (item.Key == "file")
21                     {
22                         StorageFile file = item.Value as StorageFile;
23                         HttpStreamContent streamContent = new HttpStreamContent(await file.OpenReadAsync());
24                         form.Add(streamContent, item.Key, "file.jpg");//注意:这里的值是必须的,图片所以使用的是HttpStreamContent
25                     }
26                     else
27                     {
28                         form.Add(new HttpStringContent(item.Value + ""), item.Key);
29                     }
30                 }
31                 HttpClient httpClient = new HttpClient();
32                 HttpResponseMessage response = await httpClient.PostAsync(new Uri(url), form).AsTask();
33                 var contentType = response.Content.Headers.ContentType;
34                 if (string.IsNullOrEmpty(contentType.CharSet))
35                 {
36                     contentType.CharSet = "utf-8";
37                 }
38                 return await response.Content.ReadAsStringAsync();
39 
40             }
41             catch (Exception ex)
42             {
43                 throw ;
44             }
45         }