C#中WebRequest请求的一些心得

//GET类型的请求
        public string GetContent(string uri, Encoding coding)
        {
            //Get请求中请求参数等直接拼接在url中
            WebRequest request = WebRequest.Create(uri);

            //返回对Internet请求的响应
            WebResponse resp = request.GetResponse();

            //从网络资源中返回数据流
            Stream stream = resp.GetResponseStream();

            StreamReader sr = new StreamReader(stream, coding);

            //将数据流转换文字符串
            string result = sr.ReadToEnd();

            //关闭流数据
            stream.Close();
            sr.Close();

            return result;
        }

//POST
        public string GetContentPost(string uri, string data, Encoding coding)
        {
            WebRequest request = WebRequest.Create(uri);
            request.ContentType = "application/x-www-form-urlencoded";
            request.Method = "POST";

            //将字符串数据转化为字节串,这也是POST请求与GET请求区别的地方
            byte[] buffer = coding.GetBytes(data);
            
            //用于将数据写入Internet资源
            Stream stream = request.GetRequestStream();
            stream.Write(buffer, 0, buffer.Length);
            request.ContentLength = buffer.Length;

            WebResponse response = request.GetResponse();

            //从网络资源中返回数据流
            stream = response.GetResponseStream();

            StreamReader sr = new StreamReader(stream, coding);

            //将数据流转换文字符串
            string result = sr.ReadToEnd();

            //关闭流数据
            stream.Close();
            sr.Close();

            return result;
        }

//回调验证证书问题
        public bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
        {
            //直接返回true，接受指定证书进行身份验证  
            return true;
        }

        //Get
        public string GetContent(string uri, Encoding coding)
        {

            //下面一行代码一定卸载请求开始前。
            //使用回调的方法进行验证。
            ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);
            
            //Get请求中请求参数等直接拼接在url中
            WebRequest request = WebRequest.Create(uri);

            //返回对Internet请求的响应
            WebResponse resp = request.GetResponse();

            //从网络资源中返回数据流
            Stream stream = resp.GetResponseStream();

            StreamReader sr = new StreamReader(stream, coding);

            //将数据流转换文字符串
            string result = sr.ReadToEnd();

            //关闭流数据
            stream.Close();
            sr.Close();

            return result;
        }

        //POST
        public string GetContentPost(string uri, string data, Encoding coding)
        {
            //下面一行代码一定卸载请求开始前。
            //使用回调的方法进行验证。
            ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);

            WebRequest request = WebRequest.Create(uri);
            request.ContentType = "application/x-www-form-urlencoded";
            request.Method = "POST";

            //将字符串数据转化为字节串,这也是POST请求与GET请求区别的地方
            byte[] buffer = coding.GetBytes(data);

            //用于将数据写入Internet资源
            Stream stream = request.GetRequestStream();
            stream.Write(buffer, 0, buffer.Length);
            request.ContentLength = buffer.Length;

            WebResponse response = request.GetResponse();

            //从网络资源中返回数据流
            stream = response.GetResponseStream();

            StreamReader sr = new StreamReader(stream, coding);

            //将数据流转换文字符串
            string result = sr.ReadToEnd();

            //关闭流数据
            stream.Close();
            sr.Close();

            return result;
        }

//只需在证书验证的回调函数中添加几行代码即可
//回调验证证书问题
        public bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
        {
            Console.WriteLine("证书的有效日期：" + certificate.GetEffectiveDateString());
            Console.WriteLine("证书的到期日期：" + certificate.GetExpirationDateString());
            Console.WriteLine("证书格式名称：" + certificate.GetFormat());
            Console.WriteLine("证书办法机构名称：" + certificate.Issuer);
            Console.WriteLine("密钥算法信息：" + certificate.GetKeyAlgorithm());
            Console.WriteLine("证书的公钥：" + certificate.GetPublicKeyString());
            Console.WriteLine("证书序列号：" + certificate.GetSerialNumberString());
            // 总是接受    
            return true;
        }