第一次用markdown写博客，体验下

因为常用Http的几种请求方式，总结一下。

1.封装两个Http的最常用方法，叫做HttpHelper类。

HttpPost:

    public static string HttpPost(string Url, string postDataStr)

    {

        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);

        request.Method = "POST";

        request.ContentType = "application/x-www-form-urlencoded";

        request.ContentLength = postDataStr.Length;

        StreamWriter writer = new StreamWriter(request.GetRequestStream(), Encoding.ASCII);

        writer.Write(postDataStr);

        writer.Flush();

        HttpWebResponse response = (HttpWebResponse)request.GetResponse();

        string encoding = response.ContentEncoding;

        if (encoding == null || encoding.Length < 1)

        {

            encoding = "UTF-8"; //默认编码

        }

        StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding(encoding));

        string retString = reader.ReadToEnd();

        return retString;

    }

HttpGet:

    public static string HttpGet(string Url)

    {

        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);

        request.Method = "GET";

        request.ContentType = "text/html;charset=UTF-8";

        HttpWebResponse response = (HttpWebResponse)request.GetResponse();

        Stream myResponseStream = response.GetResponseStream();

        StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.UTF8);

        string retString = myStreamReader.ReadToEnd();

        myStreamReader.Close();

        myResponseStream.Close();

        return retString;

    }

WebClientde中Post和Get:

	//Post

	using (var client = new WebClient())

	{

	    client.Headers[HttpRequestHeader.ContentType] = "application/json";

	    client.Encoding = Encoding.UTF8;

	    result = client.UploadString(postUrl, "POST", postData);

	}

	//Get

	var wc = new WebClient();

	var jsonResult = wc.DownloadString(Url);

封装好Http的方法，直接传入Url和postData即可，不必每次创建request对象。

更新：the remote server returned an error (401) unauthorized

    var req = (HttpWebRequest)WebRequest.Create(tgtUrl);

    req.UseDefaultCredentials = true;

    req.PreAuthenticate = true;

    req.Credentials = CredentialCache.DefaultCredentials;

    var response = req.GetResponse();

    var stream = req.GetRequestStream();

    var wc = new WebClient();

    //Set default credential, avoid unauthorize error

    wc.Credentials = CredentialCache.DefaultCredentials;

    wc.UseDefaultCredentials = true;