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C# Class Library Error Handling


May I do it like this : public bool Rename(string newName,out Exception exception) { if (!this._parameters.Database.Equals(this.Database.Name)) this._parameters.SelectDatabase(this.Database.Name); try { if (string.IsNullOrEmpty(newName)) throw new ArgumentException("Invalid new table name (NULL or empty)."); I try to explain it all in my answer, please see. --SA krumia 15-Feb-12 3:10am Agreed! You can create your own by subclassing Exception or one of its derivates. So, if all of the software that you are writing lives in a single layer as thin as a crispy pizza dough, then yes, I suppose there may be no need have a peek here

YA coming-of-age fantasy series, protagonist keeps pigs Successful use of strtol() in C How would I pass the output of one command to multiple commands? Hot Network Questions Redirect output of a program to a file fails Anyone knows the font style here? The .NET framework has many exception classes derived from the general Exception class. A layer of functionality generally communicates errors to the layer above by throwing exceptions. https://msdn.microsoft.com/en-us/library/ms229005(v=vs.100).aspx

C# Error Handling In Constructor

To solve your immediate issue, I think the answer you are looking for lies in: Visual Studio Toolbar->Debug->Exceptions Visual studio will "break" on various exceptions that you specify, and anything not Understand that English isn't everyone's first language so be lenient of bad spelling and grammar. 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. When was this language released?

Clearly state in the documentation if the protected method does not do argument checking. IndexOutOfRangeException SystemException Thrown by the runtime only when an array is indexed improperly. COMException ExternalException Exception encapsulating COM Hresult information. Error Handling In C# Best Practices If those answers do not fully address your question, please ask a new question.

Yes, unless the library can truly handle the error and still fulfil its contract. You do not need to try/catch inside all functions. The Exception class has three methods of its own. http://stackoverflow.com/questions/16093905/c-sharp-class-library-exception-handling Add a Solution Add your solution here B I U S small BIG code Plain TextC++CSSC#Delphi / PascalF#HTML / XML / ASPJavaJavascriptObjective-CSQLPerlPHPPythonVBXMLvar < > & link [^] encode untab case indent

I can't see why you should create your own mechanism using events, delegates, etc. Error Handling C# Mvc Radio button group label for employee leaving, terminated, or retired Why does the Canon 1D X MK 2 only have 20.2MP Is the person in the mirror an example of a My girlfriend has mentioned disowning her 14 y/o transgender daughter "ON the west of New York?" Is this preposition correct? Use the numbers 1-9 to equal 1150 Is "The empty set is a subset of any set" a convention?

C# Error Handling Get Line Number

Any better and faster way ? Please advice. C# Error Handling In Constructor So when a client instantiates my class, I'll provide the option for the client to specify an error handling method? C# Error Handling Framework Hi all, I'm currently writing a load of class libraries, but not the main application iteslf.

My B2 visa was stamped for six months even though I only stayed a few weeks. navigate here A request to open a file that generates an ExecutionEngineException should not be handled because the underlying cause of the exception cannot be known with any degree of certainty, and the Use Inner exceptions (chained exceptions). All code inside the finally block will be executed no-matter-what before the call is returned to the caller. C# Error Handling Techniques

C#C++VB Copy public class BadExceptionHandlingExample2 { public void DoWork() { // Do some work that might throw exceptions. } public void MethodWithBadHandler() { try { DoWork(); } catch (Exception e) { The following code example demonstrates incorrectly testing for special exceptions for the purposes of re-throwing them. There should be no performance impact other than that you have to type-cast to the exception specific class you want to handle. .... Check This Out If it is public then you don't want to be embarrassed, catch the exception in the Logger class and send an urgent email to the admin.

Do not expose privileged information in exception messages. C Sharp Class Library For example, all System.IO exceptions are grouped under IOException (derived from SystemException) and all Microsoft.Media exceptions could be grouped under MediaException (derived from ApplicationException). See ASP.NET Ajax CDN Terms of Use – http://www.asp.net/ajaxlibrary/CDN.ashx. ]]> Developer Network Developer Network Developer Sign in MSDN subscriptions

Say an error occurred in class D, how would I get that error back to C to B to A to the main application?

What if I want to return for a short visit after those six months end? At the moment I have a bool errBl and a string errMsg in my classes. Used in unmanaged code Interop. Java Class Library 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

Group new exceptions derived from SystemException or ApplicationException by namespace. C# Copy class File { string fileName; public byte[] Read(int bytes) { if (!ReadFile(handle, bytes)) throw NewFileIOException(); } FileException NewFileIOException() { string description = // Build localized string, include fileName. More modern programming languages, such as C++, Java, C# and VB.NET, base their error-handling strategy on code isolation. http://iembra.org/error-handling/c-custom-error-handling-class.php For example, its Message property gives you the error message text that you can display on the screen so that your user can report that back to you.

You can catch it with something like that: private void ButtonClick(...) { try{ Class1.MethodCall(); } catch(Exception ex) { //Handle the exception here } } share|improve this answer answered Dec 8 '13 Thanks –Sunil Jul 26 '13 at 4:08 add a comment| 1 Answer 1 active oldest votes up vote 3 down vote accepted You can subscribe to global event handler like AppDomain.UnhandledException Multiple Alignments in flalign Leaving my passport at the embassy to receive a visa but it is my only identification document Unit square inside triangle. If you have a try-catch in button_click, you can display the error message in a messagebox in the catch block.

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... This is a fictitious example to get the problem explained. See more: C# .NET C#4.0 DLL Which way is the best way for handling exceptions in C# class library ?