Exception handling in c#

Exception Handling in C#

Prepared by:Ezzat Harki

Copyright © 2013 Ezzat Harki

What Aim in This presentation

Introduction to exception Advantage for pupil Mark for myself


What is Exception

An exception is a problem that arises during the execution of a program. A C# exception is a response to an exceptional circumstance that arises while a program is running, such as an attempt to divide by zero.


This mechanism consist of

Find the problem Inform that an error has occurred Receive the error information Take corrective action


Type of all Exception Class in C# library

NameAccess Violation ExceptionAggregateExceptionAppDomainUnloadedExceptionApplicationExceptionArgumentExceptionArgumentNullExceptionArgumentOutOfRangeExceptionArithmeticExceptionArrayTypeMismatchExceptionBadImageFormatExceptionCannotUnloadAppDomainException


Cont.Type of all Exception Class in C# libraryNameContextMarshalExceptionDataMisalignedExceptionDecoderFallbackExceptionDirectoryNotFoundExceptionDivideByZeroExceptionDllNotFoundExceptionDriveNotFoundExceptionDuplicateWaitObjectExceptionEncoderFallbackExceptionEndOfStreamExceptionEntryPointNotFoundExceptionExecutionEngineException


Cont.Type of all Exception Class in C# library

NameFieldAccessExceptionFileLoadExceptionFileNotFoundExceptionFormatExceptionIndexOutOfRangeExceptionInsufficientExecutionStackExceptionInsufficientMemoryExceptionInternalBufferOverflowExceptionInvalidCastExceptionInvalidDataExceptionInvalidOperationExceptionInvalidProgramExceptionInvalidTimeZoneExceptionIOException


Cont.Type of all Exception Class in C# libraryName KeyNotFoundExceptionMemberAccessExceptionMethodAccessExceptionMissingFieldExceptionMissingMemberExceptionMissingMethodExceptionMulticastNotSupportedExceptionNotFiniteNumberExceptionNotImplementedExceptionNotSupportedExceptionNullReferenceExceptionObjectDisposedExceptionOperationCanceledExceptionOutOfMemoryException


Cont.Type of all Exception Class in C# libraryNameOverflowExceptionPathTooLongExceptionPlatformNotSupportedExceptionRankExceptionStackOverflowExceptionSystemExceptionTaskCanceledExceptionTaskSchedulerExceptionTimeoutExceptionTimeZoneNotFoundExceptionTypeAccessExceptionTypeInitializationExceptionTypeLoadExceptionTypeUnloadedException


Cont.Type of all Exception Class in C# libraryNameUnauthorizedAccessExceptionUriFormatException


In C# Exception Handling is Managed by that Keyword Try Catch Finally Throw checked Unchecked


Diagram working try & catch

Try block


Catch block

Statement thatCause Exception

Statement thatCause Exception

Diagram working try & catch wit Finally

Try block


finally

Catch block

finally

Coding How to work try & catch with finallyTry

{statement;//statement causing exception }

Catch(exception type varable){statement;//error handling code}

finally{//statement to be executedstatement;}



It is Coding Example of Exception byte x = 129, y = 129, result; try { result =unchecked ((byte)(x + y)); Console.WriteLine("The Result is Unchecked ", result); //at The Top Line Result is Unchecked But Get Wrong Result Becouse byte always can

256 count result =checked((byte)(x + y)); Console.WriteLine("The Result is Checked ", result); //But in This Line Checked Result if Get Overflow Tell you

} catch (OverflowException ovex) { Console.WriteLine(ovex.Message); }


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Exception handling in c#