C# HTTP系列3 HttpWebRequest.ContentType属性

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获取或设置请求的 Content-type HTTP 标头的值。默认值为null。

常见的请求内容类型为以下几种：

 /// <summary>
 /// HTTP 内容类型(Content-Type)
 /// </summary>
 public class HttpContentType
 {
     /// <summary>
     /// 资源类型：普通文本
     /// </summary>
     public const string TEXT_PLAIN = "text/plain";

     /// <summary>
     /// 资源类型：JSON字符串
     /// </summary>
     public const string APPLICATION_JSON = "application/json";

     /// <summary>
     /// 资源类型：未知类型(数据流)
     /// </summary>
     public const string APPLICATION_OCTET_STREAM = "application/octet-stream";

     /// <summary>
     /// 资源类型：表单数据(键值对)
     /// </summary>
     public const string WWW_FORM_URLENCODED = "application/x-www-form-urlencoded";

     /// <summary>
     /// 资源类型：表单数据(键值对)。编码方式为 gb2312
     /// </summary>
     public const string WWW_FORM_URLENCODED_GB2312 = "application/x-www-form-urlencoded;charset=gb2312";

     /// <summary>
     /// 资源类型：表单数据(键值对)。编码方式为 utf-8
     /// </summary>
     public const string WWW_FORM_URLENCODED_UTF8 = "application/x-www-form-urlencoded;charset=utf-8";

     /// <summary>
     /// 资源类型：多分部数据
     /// </summary>
     public const string MULTIPART_FORM_DATA = "multipart/form-data";
 }

提交的时候可以说明编码的方式，用来使对方服务器能够正确的解析。

该ContentType的属性包含请求的媒体类型。分配给ContentType属性的值在请求发送Content-typeHTTP标头时替换任何现有内容。

要清除Content-typeHTTP标头，请将ContentType属性设置为null。

此属性的值存储在WebHeaderCollection中。如果设置了WebHeaderCollection，则属性值将丢失。

参考示例代码：

 private HttpResult Request(string url, string data, string method, string contentType)
 {
     HttpResult httpResult = new HttpResult();
     HttpWebRequest httpWebRequest = null;

     try
     {
         httpWebRequest = WebRequest.Create(url) as HttpWebRequest;
         httpWebRequest.Method = method;
         httpWebRequest.Headers = HeaderCollection;
         httpWebRequest.CookieContainer = CookieContainer;
         /*此属性的值存储在WebHeaderCollection中。如果设置了WebHeaderCollection，则属性值将丢失。
          *所以放置在Headers 属性之后设置
         */
         httpWebRequest.ContentType = contentType;
         httpWebRequest.UserAgent = _userAgent;
         httpWebRequest.AllowAutoRedirect = _allowAutoRedirect;
         httpWebRequest.ServicePoint.Expect100Continue = false;

         if (data != null)
         {
             httpWebRequest.AllowWriteStreamBuffering = true;
             using (Stream requestStream = httpWebRequest.GetRequestStream())
             {
                 requestStream.Write(EncodingType.GetBytes(data), , data.Length);
                 requestStream.Flush();
             }
         }

         HttpWebResponse httpWebResponse = httpWebRequest.GetResponse() as HttpWebResponse;
         if (httpWebResponse != null)
         {
             GetResponse(ref httpResult, httpWebResponse);
             httpWebResponse.Close();
         }
     }
     catch (WebException webException)
     {
         GetWebExceptionResponse(ref httpResult, webException);
     }
     catch (Exception ex)
     {
         GetExceptionResponse(ref httpResult, ex, method, contentType);
     }
     finally
     {
         if (httpWebRequest != null)
         {
             httpWebRequest.Abort();
         }
     }

     return httpResult;
 }

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