C# Gestion des erreurs pour HttpWebRequest

Question

Je suis relativement nouveau en programmation. J'ai besoin de gestion des exceptions pour mon HttpWebRequest à un Api. Ci-dessous est mon code, je n'ai pas fait de gestion des erreurs avant donc juste un exemple de la façon d'accomplir cela sera apprécié.

private void button1_Click(object sender, EventArgs e) 
    { 
     Class1.PostDevices x = new Class1.PostDevices(); 

     HttpWebRequest request = (HttpWebRequest)WebRequest.Create(webAddr); 
     request.ContentType = "application/json"; 
     request.Method = "POST"; 
     request.Timeout = 5000; 

     using (var streamWriter = new StreamWriter(request.GetRequestStream())) 
     { 
      string jsonstring; 
      MemoryStream stream1 = new MemoryStream(); 
      DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(Class1.PostDevices)); 

      x.notification = new Class1.Notification(); 
      x.profile = "dev"; 
      x.notification.message = "Hello World"; 

      ser.WriteObject(stream1, x); 
      stream1.Position = 0; 
      StreamReader sr = new StreamReader(stream1); 

      jsonstring = sr.ReadToEnd(); 
      Debug.WriteLine(JObject.Parse(jsonstring)); 

      streamWriter.Write(jsonstring); 
      streamWriter.Flush(); 
     } 
     HttpWebResponse httpResponse = (HttpWebResponse)request.GetResponse(); 
     if (httpResponse.StatusCode == HttpStatusCode.OK) 
     { 
      using (var streamReader = new StreamReader(httpResponse.GetResponseStream())) 
      { 
       string result = streamReader.ReadToEnd(); 
       Debug.WriteLine(JObject.Parse(result)); 
       Reponse.PostDevicesReponse MyResult = JsonConvert.DeserializeObject<Reponse.PostDevicesReponse>(result); 
      } 
     } 
    } 
} 

Answer 1

1) Créez un dossier nommé "ExceptionTextFile" dans votre application

2) créer une classe séparée comme ci-dessous pour enregistrer l'exception

using System; 
using System.IO; 
using context = System.Web.HttpContext; 

//Define your application namespace here 
namespace YourApplicationNamespace 
{ 
    public static class ExceptionLogging 
    { 
     private static String ErrorlineNo, Errormsg, extype, exurl, ErrorLocation; 

     public static void SendErrorToText(Exception ex) 
     { 
      var line = Environment.NewLine + Environment.NewLine; 

      ErrorlineNo = ex.StackTrace.ToString(); 
      Errormsg = ex.Message; 
      extype = ex.GetType().ToString(); 
      exurl = context.Current.Request.Url.ToString(); 
      ErrorLocation = ex.Message.ToString(); 
      try 
      { 
       //Create a folder named as "ExceptionTextFile" inside your application 
       //Text File Path 
       string filepath = context.Current.Server.MapPath("~/ExceptionTextFile/"); 
       if (!Directory.Exists(filepath)) 
       { 
        Directory.CreateDirectory(filepath); 
       } 
       //Text File Name 
       filepath = filepath + DateTime.Today.ToString("dd-MM-yy") + ".txt"; 
       if (!File.Exists(filepath)) 
       { 
        File.Create(filepath).Dispose(); 
       } 
       using (StreamWriter sw = File.AppendText(filepath)) 
       { 
        string error = "Log Written Date:" + " " + DateTime.Now.ToString() 
        + line + "Error Line No :" + " " + ErrorlineNo + line 
        + "Error Message:" + " " + Errormsg + line + "Exception Type:" + " " 
        + extype + line + "Error Location :" + " " + ErrorLocation + line 
        + " Error Page Url:" + " " + exurl + line + line; 
        sw.WriteLine("-----------Exception Details on " + " " + DateTime.Now.ToString() + "-----------------"); 
        sw.WriteLine("-------------------------------------------------------------------------------------"); 
        sw.WriteLine(line); 
        sw.WriteLine(error); 
        sw.WriteLine("--------------------------------*End*------------------------------------------"); 
        sw.WriteLine(line); 
        sw.Flush(); 
        sw.Close(); 
       } 
      } 
      catch (Exception e) 
      { 
       e.ToString(); 
      } 
     } 
    } 
} 

Après que l'intérieur de votre bouton click event define try ... attrape le bloc et enregistre l'exception comme ci-dessous

private void button1_Click(object sender, EventArgs e) 
{ 
    try 
    { 
     Class1.PostDevices x = new Class1.PostDevices(); 

     HttpWebRequest request = (HttpWebRequest)WebRequest.Create(webAddr); 
     request.ContentType = "application/json"; 
     request.Method = "POST"; 
     request.Timeout = 5000; 

     using (var streamWriter = new StreamWriter(request.GetRequestStream())) 
     { 
      string jsonstring; 
      MemoryStream stream1 = new MemoryStream(); 
      DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(Class1.PostDevices)); 

      x.notification = new Class1.Notification(); 
      x.profile = "dev"; 
      x.notification.message = "Hello World"; 

      ser.WriteObject(stream1, x); 
      stream1.Position = 0; 
      StreamReader sr = new StreamReader(stream1); 

      jsonstring = sr.ReadToEnd(); 
      Debug.WriteLine(JObject.Parse(jsonstring)); 

      streamWriter.Write(jsonstring); 
      streamWriter.Flush(); 
     } 
     HttpWebResponse httpResponse = (HttpWebResponse)request.GetResponse(); 
     if (httpResponse.StatusCode == HttpStatusCode.OK) 
     { 
      using (var streamReader = new StreamReader(httpResponse.GetResponseStream())) 
      { 
       string result = streamReader.ReadToEnd(); 
       Debug.WriteLine(JObject.Parse(result)); 
       Reponse.PostDevicesReponse MyResult = JsonConvert.DeserializeObject<Reponse.PostDevicesReponse>(result); 
      } 
     } 
    } 
    } 
    catch (Exception e) 
    { 
    ExceptionLogging.SendErrorToText(e);     
    } 
} 

Si une erreur apparaît, accédez au dossier "ExceptionTextFile" et vérifiez le journal. L'exception serait enregistrée ici.

essayer de me revenir si cela résout votre problème ou non