C# Get方式请求Http

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rivate static readonly string DefaultUserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
        /// <summary>  
        /// 创建GET方式的HTTP请求  
        /// </summary>  
        /// <param name="url">请求的URL</param>  
        /// <param name="timeout">请求的超时时间</param>  
        /// <param name="userAgent">请求的客户端浏览器信息，可以为空</param>  
        /// <param name="cookies">随同HTTP请求发送的Cookie信息，如果不需要身份验证可以为空</param>  
        /// <returns></returns>  
        public static string CreateGetHttpResponse(string url, int? timeout, string userAgent, CookieCollection cookies)
        {
            if (string.IsNullOrEmpty(url))
            {
                throw new ArgumentNullException("url");
            }
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            request.Method = "GET";
            request.UserAgent = DefaultUserAgent;
            if (!string.IsNullOrEmpty(userAgent))
            {
                request.UserAgent = userAgent;
            }
            if (timeout.HasValue)
            {
                request.Timeout = timeout.Value;
            }
            if (cookies != null)
            {
                request.CookieContainer = new CookieContainer();
                request.CookieContainer.Add(cookies);
            }
            System.Net.HttpWebResponse response;
            response = (System.Net.HttpWebResponse)request.GetResponse();
            System.IO.StreamReader myreader = new System.IO.StreamReader(response.GetResponseStream(), Encoding.UTF8);
            string responseText = myreader.ReadToEnd();
            myreader.Close();
            return responseText;
            
        }

将指定的JSON字符串转换为 T 类型的对象

添加引用：System.Web.Extensions

 添加命名空间：using System.Web.Script.Serialization;

               /// <summary>  
        /// 将指定的 JSON 字符串转换为 T 类型的对象。  
        /// </summary>  
        /// <typeparam name="T">所生成对象的类型。</typeparam>  
        /// <param name="input">要进行反序列化的 JSON 字符串。</param>  
        /// <param name="def">反序列化失败时返回的默认值。</param>  
        /// <returns>反序列化的对象。</returns>  
        public static T JosnDeserialize<T>(string input, T def)
        {
            if (string.IsNullOrEmpty(input))
                return def;
            try
            {
                JavaScriptSerializer jsSerializer = new JavaScriptSerializer();
                return jsSerializer.Deserialize<T>(input);
            }
            catch (InvalidOperationException)
            {
                return def;
            }
        }

Http请求调用

 
  /// <summary>
        /// 激活信息
        /// </summary>
        [Serializable()]
        public class ResultInfo
        {
            /// <summary>
            /// 0 失败；1 成功
            /// </summary>
            public int flag { get; set; }

            /// <summary>
            /// 执行消息
            /// </summary>
            public string msg { get; set; }
}
string strGetUrl = strParmUrl+"?" + strParamValue;
 CookieCollection cookies = new CookieCollection();//如何从response.Headers["Set-Cookie"];中获取并设置CookieCollection的代码略  
            string  strResult = HttpHelpTools.CreateGetHttpResponse(strGetUrl, null, null, cookies);
            ResultInfoitem = JosnDeserialize<ResultInfo>(strResult, null);

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