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), 0, 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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