MVC Exception Not Being Caught In Try Catch Block?
Jan 21, 2010
I have tried this on two different controller methods now, and both times, even if the linq2sql doesn't allow the data to be saved, the code never jumps into the catch block.
I've watched the noun object in the middle of the trace, and the isvalid property is false, but the modelstate isvalid is true. Either way, the code never jumps into the catch block.I'm pulling my hair out about this. I feel like it will be something really silly.
The code all works similar to nerd dinner.
NounRepository nounRepository = new NounRepository();
Noun noun = new Noun();
try[code]...
I'd rather not have to add code in this manner though, as it seems like an unnecessary duplication.
while doing debugging i found a blue dotted corner around catch block, while hovering it is showing system.exception...what does it mean and what to do
regarding one issue I am facing. I created a httpmodule for hadling the unhandled errors and I need to log those errors using log 4 net in database.Everting working fine but I am not getting any error information once the error was hadled and I need that info too. I want to make it as a centralize module which can trap all errors and log those errors.How call application_error event of httpmodule from catch block...so that I can log that info there and I no need log in every catch block..
My question is, I have a PL, BL and DAL layered architecture (In which all these components are hosted in a single web server).
With the above architecture, i have only placed try catch block in all my events in aspx.cs pages in PL ALONE and NO TRY CATCH BLOCK IN BL AND DAL.
There is one command timeout exception happening at the DAL layer and the exception bubbles back to the PL(aspx page event which is having the try catch block). This try catch block catches the exeption and logs the exception information to database and displays useful information in the UI.
WIth the above approach, sometime very rarely(only once till now) exception is not caught in the PL for the commandtimeout exception thrown from DAL implicitly.I confirmed the exception is not caught because the exception information is not logged into the database and also no useful information displayed in UI.
Why the exception from DAL dint bubble down to PL? Do we need to explicitly throw exception from DAL or BL i.e by having try catch block in BL and DAL ?
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Threading.ThreadAbortException: Thread was being aborted.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
I even created a global.asax file and on the Application_Error event, I wrote a code that would email me the error (and i'm not getting an email regarding that error when I get the error shown above). I know for a fact that the thread is going inside the "try" statement because I send emails to myself whenever it finishes certain codes inside of it. So how come I'm getting that error in my browser instead of it being handled in my "catch" statement? I have two problems here, one, why is the exception not going to my "catch" statement, and two, why am I getting that error in the first place.
I have (pretty much) the following code in my protected void Application_Error(object sender, EventArgs e) method in Global.asax....
Exception ex = Server.GetLastError();
if (ex is System.Security.SecurityException)
Response.Redirect("Logon.aspx");
else
Response.Redirect("ErrorPage.aspx");
If I navigate to a page before I log on the exception is caught and I am redirected to Login.aspx as I would expect. However, this is only working when debugging using VS on my local machine.When uploaded to the live environment, the exception is not caught and the user is presented with "Security Exception - Request for principal permission failed."
I have a page here with a few list views on it that are all bound to Linq data sources and they seem to be working just fine.I want to add validation such that when a checkbox (IsVoid on the object) is checked, comments must be entered (VoidedComments on the object).
Here's the bound object's OnValidate method:
partial void OnValidate(ChangeAction action) { if (action == ChangeAction.Update) [code]....
Despite there being a dynamic validator on the page referencing the same ValidationGroup as the dynamic control, when the exception fires, it's caught in JavaScript and the debugger wants to break in. The message is never delivered to the UI as expected.
I have a .exe application that runs daily. I want to avoid sending emails each time an exception is caught.I want to compile a list of errors (in a unique log file fileupload[mm/dd/yyyy].log) while the application runs. Then send an email with the log attached after it the application finishes.What would be the approach for this?
I have to call the function, when exception occured. Is it possible to call the function in Catch block (Try-Catch)? I have tried it but the function did not get invoked. What i have to do for it? Shall we unable to call the functions in Catch block? I have shown my code below.
Try
Catch ex As Exception ErrorHandlers.LogErrorDetails(ex, Session("UserId").ToString, "") Throw ex End Try.
I knew, We can invoke this function in Finally block but i do not need as per my requirements.
Should I write it for each method or only in event handlers or ????
What happens when an exception occurrs? What is the stack for exception?
If I use it at entry point (event handlers) then how do I get actually at which line error occurred?
Suppose an exception was thrown from Data Access Layer How do I get it in presentation layer that exactly in which class method at which line why that error occurred?
Is it true that excessive use of try catch makes application slow?
I am being told that adding a try catch block adds major performance cost in the order of 1000 times slower than without, in the example of a for loop of a million. Is this true?
Isn't it best to use try catch block as much as possible?
Can somebody show me a better approach of looping through a Try -Catch statement. I have something like this:
Try dbConn.Open() Catch ex As Exception errmsg = ex.Message End Try
I need to try to connect 5 times before logging an error. My first thought was to nest Try - Catch 5 levels but I didn't like that idea. I'm sure there is better solution to it.
Since everyone yells at me that MessageBox doesn't work when the project is uploaded to the server, I need to migrate to javascript alert box. As I was changing my MessageBoxes, I tested and found that they weren't being produced. I'm not sure if it matters, but they are in a try/catch block, which is shown here:[Code]....
This all worked before when I had MessageBox - it showed, then the page redirected when I clicked Ok.
I either don't understand how try/catch works, the javascript isn't adding, or Response.Redirect is executed before I can see the alert box and click Ok on it.
(just as a note, everything works fine, but the alert box doesn't show)........if I add the (javascript) code before the try block, the alert box comes up, so it's not something wrong with the writing of the javascript or executing it at least (I think).
When the Stored procedure is executed through SQL Server Management Studio, its taking 23 seconds,When the same Stored proc is called through web app, its throwing below copied exception. It is noticed that when the data is more than 100k records this exception is thrown other wise expected records are shown in UI. Another stored proc from the same app returns over 150k records without any excetpion. Can't conclude that the exception is in Stored proc, because it works from SQL Server Management studio, but throws below exception from Web app.
using (OracleConnection myConn = new OracleConnection(connectionString)) { OracleCommand myCmd = new OracleCommand("sproc", myConn); myCmd.CommandType = CommandType.StoredProcedure; myCmd.Parameters.AddWithValue("p1", a1);[code].....
Second format just doesn't feel right but I am not that experienced. I am curious if there is any downfall to that other than exception not being type specific.
I am trying to call a JavaScript function from my ascx control code behind in the catch blockI have tried the below two ways but they don't seem to work.
How/Can I Set the try, catch statment to catch a specific Error. For example i am getting the following error:
Exception Details: System.Data.SqlClient.SqlException: Incorrect syntax near '='., [SqlException (0x80131904): Incorrect syntax near '='.]
Basicly The = is part of my SQL string which points to a table that currently doesent exist. I want something like catch ex as SqlException (0x80131904) or catch ex as SqlException = "0x80131904" or even catch ex as System.Data.SqlClient.SqlException = "Incorrect syntax near '='." I just want something so i can put "table doesnt exist" in the error message without having to use:
catch ex as System.Data.SqlClient.SqlException
As i have other code on my page that could result in a different type of sqlExeption.
public dynamic GetReferenceTableData(string tableName) { try { dynamic tableData = ReferenceTableDAL.GetReferenceTableData(tableName); return tableData; } catch (Exception ex) { throw; } } method at DAL(ReferenceTableDAL): public static dynamic GetReferenceTableData(string tableName) { Database db = DatabaseFactory.CreateDatabase(Flags.ConnectionStringKey); DbCommand dbCommand = db.GetStoredProcCommand("USP_GETTABLEDATA"); dynamic objDynamic = null; if (tableName.ToLower() == "a") { objDynamic = new List<A>(); } else if (tableName.ToLower() == "b") { objDynamic = new List<B>(); } else if (tableName.ToLower() == "c") { objDynamic = new List<C>(); } try { db.DiscoverParameters(dbCommand); dbCommand.Parameters["IN_TABLENAME"].Value = tableName; DataSet dsTableData = db.ExecuteDataSet(dbCommand); if (tableName.ToLower() == "a") { foreach (DataRow dataRow in dsTableData.Tables[0].Rows) { objDynamic.Add((A)dataRow); } } else if (tableName.ToLower() == "b") { foreach (DataRow dataRow in dsTableData.Tables[0].Rows) { objDynamic.Add((B)dataRow); } } else if (tableName.ToLower() == "c") { foreach (DataRow dataRow in dsTableData.Tables[0].Rows) { objDynamic.Add((C)dataRow); } } } catch (Exception ex) { throw; } return objDynamic; } @ Aspx try { using (DataServiceRef.DataServiceClient petService = new DataServiceRef.DataServiceClient()) { dynamic tableData = petService.GetReferenceTableData(tableName); //tableData is null ,exception } } catch (Exception ex) { throw; }
There is no exception at dal or service end when i debug list gets filled ok but when returns to aspx error at aspx(no exception gets caught at @ service) but exception at aspx i.e:
Message:The underlying connection was closed: The connection was closed unexpectedly. Stack Trace: at System.Net.HttpWebRequest.GetResponse() at System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
i am almost finished up with a website and i have used this try catch block only in few places. now what i want is that i want to catch all the exception so that i can report the same through mail.. is it possible in any way to catch all the exception in one place and mail it cause now writing this block everywhere will be a kind of tedious process?
In Asp.net (c#),i'm not able to catch exception(FileNotFoundException) properly... i don't know the reason..Actually File s not there..But catch statement fails to catch the exception..here is the code..
