(HttpWebRequest模拟请求登录):当一些硬件设备接口 或需要调用其他地方的接口时，模拟请求登录获取接口的数据就很有必要。
webclient类:只想从特定的URI请求文件，则使用WebClient;
1.创建带Cookie的webclient：
???/// <summary> ?????/// 带 Cookie 的 WebClient ?????/// </summary> ?????public class CookieWebClient : WebClient ?????{ ?????????// Cookie 容器 ?????????public CookieContainer Cookies; ???????????????/// <summary> ?????????/// 创建一个新的 CookieWebClient 实例。 ?????????/// </summary> ?????????public CookieWebClient() ?????????{ ?????????????this.Cookies = new CookieContainer(); ?????????} ???????????????protected override WebRequest GetWebRequest(Uri address) ?????????{ ?????????????WebRequest request = base.GetWebRequest(address); ?????????????if (request is HttpWebRequest) ?????????????{ ?????????????????HttpWebRequest httpRequest = request as HttpWebRequest; ?????????????????httpRequest.CookieContainer = Cookies; ?????????????} ?????????????return request; ?????????} ?????} ?2.http方法（Get、POST）:
public ?CookieContainer cookies; ???????internal string HttpGet(string Url) ???????{ ???????????string result = ""; ???????????using (var client = new CookieWebClient()) ???????????{ ???????????????client.Encoding = Encoding.UTF8; ???????????????client.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded,charset=UTF-8"; ???????????????client.Cookie = cookies; ???????????????byte[] data = client.DownloadData(Url); ???????????????result = Encoding.UTF8.GetString(data); ???????????} ????????????return result; ???????} ???????internal string HttpPost(string Url, string postDataStr) ???????{ ???????????string result = ""; ???????????using (var client = new CookieWebClient()) ???????????{ ???????????????client.Encoding = Encoding.UTF8; ???????????????client.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded; charset=UTF-8"; ???????????????byte[] post = Encoding.UTF8.GetBytes(postDataStr); ???????????????byte[] data = client.UploadData(Url,post); ???????????????result = Encoding.UTF8.GetString(data); ???????????????cookies = client.Cookie; ???????????} ???????????return result; ???????}3. controller
[HttpGet] ???????public string Getinfo(string name, string pwd) ???????{ ???????????string hg = ""; ???????????string url = "http://111.38.56.130:8084/LoginHandler.ashx?time=" + DateTime.Now; ???????????string loginp = "action=Login&flag=1&name={0}&pwd={1}&isRemember=false"; ???????????string urlget = "http://111.38.56.130:8084/Company/IndexHandler.ashx?time={0}&action=deviceShowData&greenHouseSerialNum=00000F003G001"; ???????????string param = string.Format(loginp, name, pwd); ???????????exta.http h = new exta.http(); ???????????string r = h.HttpPost(url, param); ???????????if (r.Equals("0")) ???????????{ ???????????????hg = h.HttpGet(string.Format(urlget, DateTime.Now)); ???????????} ???????????return hg; ???????}webclient类学习
原文地址：http://www.cnblogs.com/wangzhe688/p/7808634.html