C#模拟发送http get、post请求的方式

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1、WebRequest

同步方式：

/// <summary>     /// 向指定URL发起请求(可用于远程发送数据)     /// </summary>     /// <param name="url">     /// <param name="data">发送的数据     /// <param name="method">     /// <returns></returns>     public static String RequestUrl(String url, byte[] data, String method = "POST")     {         try         {              WebRequest request = WebRequest.Create(url);             request.Method = method;             request.ContentType = "application/x-www-form-urlencoded";              if (data != null && data.Length > 0)             {                 request.ContentLength = data.Length;                 Stream newStream = request.GetRequestStream();                 newStream.Write(data, 0, data.Length);                 newStream.Close();             }             else             {                 request.ContentLength = 0;             }               WebResponse response = request.GetResponse();             Stream stream = response.GetResponseStream();             MemoryStream ms = new MemoryStream();             long ChunkSize = 1024;             byte[] buffer = new byte[ChunkSize];             long dataLengthToRead = response.ContentLength;//获取响应数据的总大小             while (dataLengthToRead > 0)             {                 int lengthRead = stream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小                 ms.Write(buffer, 0, lengthRead);                 dataLengthToRead = dataLengthToRead - lengthRead;             }             stream.Close();             response.Close();              string responseText = Encoding.UTF8.GetString(ms.ToArray());             return responseText;          }         catch (Exception ex)         {             return ex.Message;         }     }

异步方式：

private void Button_Click(object sender, RoutedEventArgs e)        {             string baseUri =String.Format("http://localhost:49280/Images/{0}.jpg",this.numTextBox.Text.Trim());             HttpWebRequest request =(HttpWebRequest) WebRequest.Create(baseUri);             request.Method = "GET";             request.BeginGetResponse(new AsyncCallback(ReadCallback), request);        }        public void ReadCallback(IAsyncResult asyc)        {            HttpWebRequest request = (HttpWebRequest)asyc.AsyncState;                    HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asyc);                  this.Dispatcher.BeginInvoke(() =>                     {                         Stream stream = response.GetResponseStream();                         BitmapImage bitmap = new BitmapImage();                         bitmap.SetSource(stream);                         this.image1.Source = bitmap;                     }                     );         }

2、WebClient

同步、异步方式

<pre name="code" class="csharp"> using (var client = new WebClient())                {   //发送参数                    NameValueCollection values = new NameValueCollection();                    //请求路径                    string url = ConfigurationManager.AppSettings["MerUrl"];                    //同步发送form表单请求                    byte[] retVal = client.UploadValues(url, "POST", values);

<span style="white-space:pre"></span>    //通过UploadValuesCompleted事件可绑定请求完成时的调用方法

    //获取返回结果                    result = JsonConvert.DeserializeObject<T>(Encoding.UTF8.GetString(retVal));                }

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