AJAX WebService in ASP.Net - how to handle global error handling?

Question

I have about 50+ AJAX WebMethods on my * .aspx site that is called by JQuery (sometimes raw jquery, sometimes lib).

Here are some examples:

 [WebMethod]
    public static string GetLog()
    {
        DAL.LogService log = new DAL.LogService();
        string items = log.GetLog();
        return items;
    }

    [WebMethod]
    public static void ClearBenchmarks()
    {
        DAL.LogService log = new DAL.LogService();
        log.ClearBenchmarks();
    }

    [WebMethod]
    public static void WriteLog(string message1, string message2, string user, string type)
    {
        DAL.LogService.WriteLog(message1, message2, user, type);
    }

In fact, in most cases, they only redirect to the dataLayer of my application, but actually, ofc, I have 50+ single methods ...

Now I want to enable error handling in my application - how to make it global without trying to catch in every single method?

Answer 1

- . Application_Error , JSON , , (afaik) - , jsonerror.

, global.asax.cs :

  protected void Application_PostMapRequestHandler(object sender, EventArgs e)
    {
        HttpContext context = HttpContext.Current;
        if (context.Handler is Page && !string.IsNullOrEmpty(context.Request.PathInfo))
        {
            string contentType = context.Request.ContentType.Split(';')[0];
            if (contentType.Equals("application/json", StringComparison.OrdinalIgnoreCase))
            {
                context.Response.Filter = new PageMethodExceptionLogger(context.Response);
            }
        }
    }

    public class PageMethodExceptionLogger : Stream
    {
        private readonly HttpResponse _response;
        private readonly Stream _baseStream;
        private readonly MemoryStream _capturedStream = new MemoryStream();

        public PageMethodExceptionLogger(HttpResponse response)
        {
            _response = response;
            _baseStream = response.Filter;
        }

        public override void Close()
        {
            if (_response.StatusCode == 500 && _response.Headers["jsonerror"] == "true")
            {
                _capturedStream.Position = 0;
                string responseJson = new StreamReader(_capturedStream).ReadToEnd();
                // TODO: Do the actual logging.
                JavaScriptSerializer j = new JavaScriptSerializer();
                var jsonObject = j.DeserializeObject(responseJson) as Dictionary<string, object>;
                DAL.LogService.WriteLog(jsonObject["Message"].ToString(), jsonObject["StackTrace"].ToString(), "ERROR", "ERROR");
            }

            _baseStream.Close();
            base.Close();
        }

        public override void Flush()
        {
            _baseStream.Flush();
        }

        public override long Seek(long offset, SeekOrigin origin)
        {
            return _baseStream.Seek(offset, origin);
        }

        public override void SetLength(long value)
        {
            _baseStream.SetLength(value);
        }

        public override int Read(byte[] buffer, int offset, int count)
        {
            return _baseStream.Read(buffer, offset, count);
        }

        public override void Write(byte[] buffer, int offset, int count)
        {
            _baseStream.Write(buffer, offset, count);
            _capturedStream.Write(buffer, offset, count);
        }

        public override bool CanRead { get { return _baseStream.CanRead; } }
        public override bool CanSeek { get { return _baseStream.CanSeek; } }
        public override bool CanWrite { get { return _baseStream.CanWrite; } }
        public override long Length { get { return _baseStream.Length; } }

        public override long Position
        {
            get { return _baseStream.Position; }
            set { _baseStream.Position = value; }
        }
    }

Answer 2

.Net - Application_Error global.asax -.

.

• -

• try-catch

• SOAP HTTPModule

,