• RSS
  • Facebook
  • Twitter
  • Linkedin
Home > Exception Handling > Error Handling Class Library

Error Handling Class Library


This is not a duplicate because my question here is not whether or not I should REDUCE the use of exception throw. The reason for this is because ApplicationArgument, ArgumentException and all other specialized exceptions inherits from the Exception class and therefore will be trapped by the Exception catch-block which is executed first... If you allocate expensive or limited resources such as database connections or streams, you should put the code to release them inside a finally block. Actually, that's not true - it will fail to compile, with an error such as: Test.cs(16,16): error CS0160: A previous catch clause already catches all exceptions of this or a super check over here

If you don't have a try-catch here, your program will probably shut down (crash). ArgumentNullException ArgumentException Thrown by methods that do not allow an argument to be null. If you have no try-catch around any of the calling methods in the layer above (B), the error will continue up to the client program and the click method (A). Create meaningful message text for exceptions, targeted at the developer.

Exception Handling C#

Using this approach keeps your class re-usable as it is not tied to a specifc implementation. Design classes so that in the normal course of use an exception will never be thrown. Like this one, you have no idea what terrible thing happened to the machine to make the simple operation of writing a file fail so badly. –Hans Passant Mar 24 '15

That's just what I'm after. ArgumentException SystemException Base class for all argument exceptions. See more: C# .NET C#4.0 DLL Which way is the best way for handling exceptions in C# class library ? .net Exception Handling Framework Look up "try", "catch", "throw" and "finally" in the MSDN and you will find lots of information.

It seems quite clumsy doing it that way. .net Exception Handling Best Practices The furthest I'd go with that is to allow the client to specify a logger - and that could be used for diagnostics as well as errors. by saying "A layer of functionality generally communicates errors to the layer above by throwing exceptions." you are just making a statement without explaining why - which was my question exactly. Standard Exception Types The following table lists the standard exceptions provided by the runtime and the conditions for which you should create a derived class.

ASP.NET with C# Apr 15, 2009 04:08 PM|almargob|LINK You can write to the event log if your email server is down. Exception Handling Java Best Practices Privacy Statement| Terms of Use| Contact Us| Advertise With Us| CMS by Umbraco| Hosted on Microsoft Azure Feedback on ASP.NET| File Bugs| Support Lifecycle No new comments. I explain it in more general case when I write about exclusions from the rule of thumb I mentioned in my answer -- please see. --SA Rate this: Please Sign You decide to report this back to the caller(s) as an error C --- if ( IsInvalidValue( parameter) ) throw new ArgumentException("Hey, you can't send that value to me!") this will

.net Exception Handling Best Practices

You can create your own by subclassing Exception or one of its derivates. These jokes were inspired by this link . Exception Handling C# Thanks in advance Nikola Posted 14-Feb-12 2:50am cCoderNN906 Add a Solution 3 solutions Top Rated Most Recent Rate this: Please Sign up or sign in to vote. Exception Handling Definition What you can do is soften up the exception by wrapping them in your own exceptions.

you can do variations of the catch statement, like "only catch a specific type of exception", or catch all exceptions. check my blog try { throw new Exception("Doh!"); } finally { CleanUpCode(); // Will always be executed immediatly after // the error is thrown. } I would strongly recommend MSDN. Note by author: Since writing this, I have expanded on this idea quite a bit. The syntax of the try ... Exception Handling Framework C#

General Reference for the .NET Framework Design Guidelines for Developing Class Libraries Design Guidelines for Exceptions Design Guidelines for Exceptions Exception Handling Exception Handling Exception Handling Exception Throwing Exception Handling Catching Related 59Return magic value, throw exception or return false on failure?42Why are exceptions considered better than explicit error testing?14Throwing an exception inside finally1Throwing an exception for errors that can be fixed31Is The optional finally clause will be executed regardless if there was an error or not. this content try{ //smtp code for sending email } Catch(SmtpException ex) { // what will go here? //How can the exception be seen? //Response.Write() is not allowed here. } Your input and

If you swallow all of your exceptions in a logger, the only way you're ever going to know something bad happened is to examine the log. –Robert Harvey Dec 1 '15 Exception Handling Javatpoint Reply TATWORTH All-Star 44575 Points 13653 Posts MVP Re: Class library - Exception Handler- Catch Block? SEHException ExternalException Exception encapsulating Win32 structured Exception Handling information.

Click "Mark as Answer" on the post that helped you.

Similar topics error C2061: syntax error : identifier Handle Classes: The Smart Pointer Handle Class Error creating window handle Problems with Serial Comm Handle What is the proper way to handle The following code example demonstrates incorrectly testing for special exceptions for the purposes of re-throwing them. The following code example shows how to implement a helper method. Exception Handling Sql A layer of functionality generally communicates errors to the layer above by throwing exceptions.

A ---- try { B.CallSomeMethod( myParameter ); } catch ( Exception ex ) { // catches all kinds of exceptions MessageBox.Show( ex.Message ) } you trap the bubble-up sequence in layer Understand that English isn't everyone's first language so be lenient of bad spelling and grammar. Code - namespace MvcProject.Controllers { public class HomeController : Controller { public ActionResult DoSomething() { try { Logger.CreateLog("some text."); } catch (Exception Ex) { //Exception is handled here. } return View(); Exceptions need to be handled close to the code that throws the exception, only way you can know how to recover from the mishap.

This documentation is archived and is not being maintained. The .NET framework has many exception classes derived from the general Exception class. You isolate code that could lead to an error in the try clause, and when the error does occur, program control is passed to the code in the catch clause. Nov 17 '05 #2 P: n/a Ignacio Machin \( .NET/ C# MVP \) Hi, One option is throwing exceptions, each time you detect some escenario where you cannot recover, throw an

In C you check the input parameters and find one parameter to be invalid. share|improve this answer answered Mar 24 '15 at 10:35 Henrik 1,518721 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign Any better and faster way ?