Csharp:HttpWebRequest ， HttpClient and RestSharp

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/// <summary> ///  Define other methods and classes here /// </summary> /// <param name="url"></param> /// <param name="contentType"></param> /// <returns></returns> public static Task<string> MakeAsyncRequest(string contentType, string contenttxt, string mobile) {     string url = "http://www.dusystem.com/UserServiceAPI";     HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);     request.ContentType = contentType;     request.Method = WebRequestMethods.Http.Post; //get     request.Timeout = 20000;     request.Proxy = null;     byte[] data = System.Text.Encoding.GetEncoding("gbk").GetBytes("geovindu"); //System.Text.UnicodeEncoding.ASCII.GetBytes("geovindu");//UTF8      Base64Encoder myEncoder = new Base64Encoder(data);     StringBuilder sb = new StringBuilder();     sb.Append(myEncoder.GetEncoded());     string msg = UrlEncode(contenttxt);                string content = string.Format("method={0}&isLongSms={1}&username={2}&password={3}&smstype={4}&mobile={5}&content={6}", "MS", 0, "geovindu", sb.ToString(), 0, mobile, msg);//     byte[] bytes = Encoding.GetEncoding("gbk").GetBytes(content);     request.ContentLength = bytes.Length;     Stream os = request.GetRequestStream();     //req.GetResponseAsync();       os.Write(bytes, 0, bytes.Length);     os.Close();     //System.Net.WebResponse resp = req.GetResponse();     WebResponse resp = request.GetResponse();           Task<WebResponse> task = Task.Factory.FromAsync(         request.BeginGetResponse,         asyncResult => request.EndGetResponse(asyncResult),         (object)null);       return task.ContinueWith(t => ReadStreamFromResponse(resp, content)); }   /// <summary> /// 对内容进行编码 /// </summary> /// <param name="str"></param> /// <returns></returns> private static string UrlEncode(string str) {     StringBuilder sb = new StringBuilder();     byte[] byStr = System.Text.Encoding.GetEncoding("gbk").GetBytes(str); //默认是System.Text.Encoding.Default.GetBytes(str)     for (int i = 0; i < byStr.Length; i++)     {         sb.Append(@"%" + Convert.ToString(byStr[i], 16));     }       return (sb.ToString()); } /// <summary> /// /// </summary> /// <param name="response"></param> /// <returns></returns> private static string ReadStreamFromResponse(WebResponse response, string content) {     Stream responseStream = response.GetResponseStream();     using (StreamReader sr = new StreamReader(responseStream))     {         string strContent = sr.ReadToEnd();         return strContent;     } }       delegate string SynchOperation(string value); /// <summary> /// /// </summary> /// <param name="callback"></param> /// <param name="value"></param>  void BeginTheSynchronousOperation(AsyncCallback callback, string value) {     SynchOperation op = new SynchOperation(SynchronousOperation);     op.BeginInvoke(value, callback, op); } /// <summary> /// /// </summary> /// <param name="value"></param> /// <returns></returns>  string SynchronousOperation(string value) {       string str = "geovindu";     Thread.Sleep(10000);     str = str + value;     return str; } /// <summary> /// /// </summary> /// <param name="result"></param>  void CallbackOperation(IAsyncResult result) {     // get your delegate     var ar = result.AsyncState as SynchOperation;     // end invoke and get value     var returned = ar.EndInvoke(result);     Response.Write(returned);       } /// <summary> /// /// </summary> /// <param name="sender"></param> /// <param name="e"></param> protected void Button1_Click(object sender, EventArgs e) {    BeginTheSynchronousOperation(CallbackOperation, this.TextBox1.Text.Trim());     var task = MakeAsyncRequest("application/x-www-form-urlencoded", "geovindu", "1388888888");     Response.Write(string.Format("Got response of {0}", task.Result));  //返回成功 }

　　第二种方法：  用HttpClient 更省代码  .net 4.6

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/// <summary>    /// 发送    /// </summary>    /// <param name="sender"></param>    /// <param name="e"></param>    protected void Button1_Click(object sender, EventArgs e)    {          Response.Write(isFail(sendMessage("138888888", "【六福珠宝】兴高高兴,天下为公", "geovindu")));      }      /// <summary>    /// 发送信息    /// geovindu 涂聚文    /// </summary>    /// <param name="mobile"></param>    /// <param name="contenttxt"></param>    /// <param name="user"></param>    /// <returns></returns>    private string sendMessage(string mobile, string contenttxt, string user)    {        string result = string.Empty;          Uri u = new Uri("http://www.dusystem.com/smsSend.do");        string pwd = "geovindu";//         string msg = UrlEncodeNew(contenttxt);        var payload = string.Format("username={0}&password={1}&mobile={2}&content={3}", "geovindu", pwd, mobile, msg);        HttpContent c = new StringContent(payload, Encoding.UTF8, "application/x-www-form-urlencoded");        var t = Task.Run(() => PostURI(u, c));        t.Wait();        result=t.Result;        return result;    }    /// <summary>    /// 涂聚文 Geovin Du    ///    /// </summary>    /// <param name="u"></param>    /// <param name="c"></param>    /// <returns></returns>    static async Task<string> PostURI(Uri u, HttpContent c)    {        var response = string.Empty;        using (var client = new HttpClient())        {            //string url = "http://myserver/method";            //string content = "param1=1&param2=2";            //HttpClientHandler handler = new HttpClientHandler();            //HttpClient httpClient = new HttpClient(handler);            //HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, u);            //HttpResponseMessage response = await httpClient.SendAsync(request, content);              HttpResponseMessage result = await client.PostAsync(u, c);            if (result.IsSuccessStatusCode)            {                response = result.StatusCode.ToString();                Task<string> t = result.Content.ReadAsStringAsync();                response = t.Result;            }        }        return response;    }        private bool isFail(string i)    {        bool ok = false;        if (double.Parse(i) > 0)        {            ok = true;        }        return ok;    }

　　

 

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//https://github.com/restsharp/RestSharp //https://coronavirus-tracker-api.herokuapp.com/all  Geovin Du var request = new RestRequest("/all", Method.GET); var client = new RestClient("https://coronavirus-tracker-api.herokuapp.com"); var response = client.ExecuteTaskAsync(request).Result; if (response.StatusCode != HttpStatusCode.OK)     throw new Exception($"Unable to download file"); response.RawBytes.SaveAs(filename);

　　

HttpWebRequest for control
WebClient for simplicity and brevity
RestSharp for both on non-.NET 4.5 environments
HttpClient for both + async features on .NET 4.5 environments