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Multicast Delegate Error Handling

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C# Delegate Throw Exception

Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community c# event handler throws exception of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up What happens when Exception occurs in a method in Multicast Delegate up vote 2 down vote favorite

C# Unhandled Exception Handler

2 I would like to understand whats the best way to handle exceptions in Multicast delegates ? My question is, what happens if a method throw exception in Multicast delegate execution ? Will it stop ? Continue ? How to handle ? A small program with explanation will be really helpful if somebody can share please.... thank you.... c# .net share|improve this question asked Jun 27 '12 at 21:10 Learner 1,42652357 add a comment| 2 Answers 2 active oldest votes up vote 8 down vote accepted The exception will be propagated immediately, and any "later" actions in the delegate's invocation list will not get executed. If you want to make sure you execute all the delegates - perhaps aggregating all the exceptions together, for example - you'd need to call Delegate.GetInvocationList, cast each of those delegates to the same type as the original, and invoke them one by one, catching the exceptions as they were thrown. Here's some sample code which does this - it would be nice to do this in a more generic way, ideally building a new delegate which (when executed) would execute all of the constituent delegates and aggregate the exceptions... but this is a start. using System; using System.Collections.Generic; using System.Threading.Tasks; class Program { public static void Main() { Action x = null; x += () => Console.WriteLine("First"); x += () => { throw new Exception("Bang 1"); }; x += () => { throw new Exception("Bang 2"); }; x += () => Console.WriteLine("Second"); try { ExecuteAll(x, action => action()); } catch (AggregateException e) { Console.WriteLine(e); } } public static void ExecuteAll(Delegate multi, Action invoker) { List exceptions = new List(); foreach (var single in multi.GetInvocationList()) { try { invoker((T)(object)s

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resources Windows Server 2012 resources Programs MSDN subscriptions Overview Benefits Administrators Students Microsoft Imagine Microsoft Student Partners ISV Startups TechRewards Events Community Magazine Forums Blogs Channel 9 Documentation APIs and reference Dev centers Samples Retired content https://msdn.microsoft.com/en-us/library/orm-9780596516109-03-09.aspx We’re sorry. The content you requested has been removed. You’ll be auto redirected in 1 second. Visual Studio 2008 Featured Books on Visual Studio 2008 C# 3.0 Cookbook, Third Edition: More than 250 solutions https://books.google.com/books?id=6nuUCgAAQBAJ&pg=PT902&lpg=PT902&dq=multicast+delegate+error+handling&source=bl&ots=x7vZuvtovg&sig=nNetiTlZwRHszXKkKnAkky3k7Zc&hl=en&sa=X&ved=0ahUKEwiwpu-99uLPAhWs1IMKHd1IB9MQ6AEIVzAI for C# 3.0 programmers C# 3.0 Cookbook, Third Edition: More than 250 solutions for C# 3.0 programmers Chapter 9. Delegates, Events, and Lambda Expressions Chapter 9. Delegates, Events, and Lambda Expressions Chapter 9. Delegates, event handler Events, and Lambda Expressions Chapter 9. Delegates, Events, and Lambda Expressions Chapter 17. Security Chapter 18. Threading and Synchronization Chapter 19. Toolbox TOC Collapse the table of content Expand the table of content This documentation is archived and is not being maintained. This documentation is archived and is not being maintained. This documentation is archived and is not being maintained. Delegates, Events, and Lambda Expressions This chapter multicast delegate error is excerpted from C# 3.0 Cookbook, Third Edition: More than 250 solutions for C# 3.0 programmers by Jay Hilyard, Stephen Teilhet, published by O'Reilly Media IntroductionA delegate is an object which represents a method and, optionally, the "this" object associated with that method. When the delegate is invoked, the corresponding method is invoked. Delegates contain all that is needed to allow a method, with a specific signature and return type, to be invoked by your code. A delegate can be passed to methods, and a reference to it can be stored in a structure or class. A delegate is used when, at design time, you do not know which method you need to call, and the information to determine this is available only at runtime.Another scenario, is when the code calling a method is being developed independently of the code that will supply the method to be called. The classic example is a Windows Forms control. If you create a control, you are unlikely to know what method should be called in the application when the control raises an event, so you must provide a delegate to allow the application to hook up a handler to the event. When other develope

from GoogleSign inHidden fieldsBooksbooks.google.com - “ Welcome to one of the greatest collaborations you could dream of in the world of C# books—and probably far beyond!” —From the Foreword by Mads Torgersen, C# Program Manager, Microsoft   Essential C# 6.0 is a well-organized, no-fluff guide to the latest versions of C# for programmers...https://books.google.com/books/about/Essential_C_6_0.html?id=6nuUCgAAQBAJ&utm_source=gb-gplus-shareEssential C# 6.0My libraryHelpAdvanced Book SearchGet print bookNo eBook availableAmazon.comBarnes&Noble.com - $44.99Books-A-MillionIndieBoundFind in a libraryAll sellers»Get Textbooks on Google PlayRent and save from the world's largest eBookstore. Read, highlight, and take notes, across web, tablet, and phone.Go to Google Play Now »Essential C# 6.0Mark Michaelis, Eric LippertPearson Education, Sep 19, 2015 - Computers - 1008 pages 0 Reviewshttps://books.google.com/books/about/Essential_C_6_0.html?id=6nuUCgAAQBAJ “ Welcome to one of the greatest collaborations you could dream of in the world of C# books—and probably far beyond!” —From the Foreword by Mads Torgersen, C# Program Manager, Microsoft   Essential C# 6.0 is a well-organized, no-fluff guide to the latest versions of C# for programmers at all levels of experience. Fully updated to reflect new C# 6.0 and .NET 4.6 features and patterns, it will help you write C# code that’s simple, powerful, robust, secure, and maintainable.   This book’s authors are world-class C# experts: long-time Microsoft MVP and Regional Director Mark Michaelis and Eric Lippert, formerly principal developer on Microsoft’s C# compiler team. Together, they cover the entire language, illustrating key constructs with succinct examples and offering a complete foundation for successf

 

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