Architecture :: Exception Not Caught?
Nov 22, 2010
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 ?
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Jan 21, 2010
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The code all works similar to nerd dinner.
NounRepository nounRepository = new NounRepository();
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In our project WCF service is acting as our BLL.
i had scenario where i had to fill list of object class without knowing its type see code:
Added contract
[OperationContract]
dynamic GetReferenceTableData(string tableName);
method in service:
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;
}
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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)
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[Code]....
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{
}
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}
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BUTTONS:
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