C# HTTP系列12 以form-data方式上传键值对集合到远程服务器

 1 /// <summary>
 2 ///  HTTP请求(包含表单数据)
 3 /// </summary>
 4 /// <param name="url">请求目标URL</param>
 5 /// <param name="kvDatas">请求时表单键值对数据</param>
 6 /// <param name="method">请求的方法。请使用 WebRequestMethods.Http 的枚举值</param>
 7 /// <returns></returns>
 8 public HttpResult UploadForm(string url, NameValueCollection kvDatas, string method = WebRequestMethods.Http.Post)
 9 {
10     HttpResult httpResult = new HttpResult();
11     HttpWebRequest httpWebRequest = null;
12 
13     try
14     {
15         httpWebRequest = WebRequest.Create(url) as HttpWebRequest;
16         httpWebRequest.Method = method;
17         httpWebRequest.Headers = HeaderCollection;
18         httpWebRequest.CookieContainer = CookieContainer;
19         httpWebRequest.ContentType = HttpContentType.WWW_FORM_URLENCODED;
20         httpWebRequest.UserAgent = _userAgent;
21         httpWebRequest.AllowAutoRedirect = _allowAutoRedirect;
22         httpWebRequest.ServicePoint.Expect100Continue = false;
23 
24         if (kvDatas != null)
25         {
26             StringBuilder sbKV = new StringBuilder();
27             foreach (string key in kvDatas.Keys)
28             {
29                 sbKV.AppendFormat("{0}={1}&", Uri.EscapeDataString(key), Uri.EscapeDataString(kvDatas[key])); //注意中文编码
30             }
31 
32             httpWebRequest.AllowWriteStreamBuffering = true;
33             using (Stream requestStream = httpWebRequest.GetRequestStream())
34             {
35                 requestStream.Write(EncodingType.GetBytes(sbKV.ToString()), 0, sbKV.Length - 1);
36                 requestStream.Flush();
37             }
38         }
39 
40         HttpWebResponse httpWebResponse = httpWebRequest.GetResponse() as HttpWebResponse;
41         if (httpWebResponse != null)
42         {
43             GetResponse(ref httpResult, httpWebResponse);
44             httpWebResponse.Close();
45         }
46     }
47     catch (WebException webException)
48     {
49         GetWebExceptionResponse(ref httpResult, webException);
50     }
51     catch (Exception ex)
52     {
53         GetExceptionResponse(ref httpResult, ex, method, HttpContentType.WWW_FORM_URLENCODED);
54     }
55     finally
56     {
57         if (httpWebRequest != null)
58         {
59             httpWebRequest.Abort();
60         }
61     }
62 
63     return httpResult;
64 }

 1 /// <summary>
 2 /// HTTP请求(包含表单数据)
 3 /// </summary>
 4 /// <param name="url">请求目标URL</param>
 5 /// <param name="kvDatas">请求时表单键值对数据</param>
 6 /// <param name="method">请求的方法。请使用 WebRequestMethods.Http 的枚举值</param>
 7 /// <returns></returns>
 8 public HttpResult UploadForm(string url, Dictionary<string, string> kvDatas, string method = WebRequestMethods.Http.Post)
 9 {
10     var nvc = kvDatas.ToNameValueCollection();
11 
12     return UploadForm(url, nvc, method);
13 }

Dictionary 转换成 NameValueCollection 集合的扩展方法如下：

 1 /// <summary>
 2 ///  自定义扩展方法：将字典转换为 NameValueCollection 集合对象
 3 /// </summary>
 4 /// <param name="dict">扩展对象</param>
 5 /// <returns></returns>
 6 public static NameValueCollection ToNameValueCollection<TKey, TValue>(this IDictionary<TKey, TValue> dict)
 7 {
 8     if (dict == null)
 9     {
10         return null;
11     }
12 
13     var nameValueCollection = new NameValueCollection();
14 
15     foreach (var item in dict)
16     {
17         string value = null;
18         if (item.Value != null)
19         {
20             value = item.Value.ToString();
21         }
22 
23         nameValueCollection.Add(item.Key.ToString(), value);
24     }
25 
26     return nameValueCollection;
27 }