Event Delegate Unreachable

Question

Hi everyone I tried to create and handle an event in C# for the first time but I met a problem. I declared an event delegate in a static class called ArchiveurPerfsBJ . Here the declaration : public I have implemented a callback method in the static class containing the main method. The class is called EntreeConsole . Here is the prototype of the callback method : private I have written a statement to affect the callback method to the delegate as I read in a C# book. Unfortunately the statement generates an error before execution. Here is the statement : ArchiveurPerfsBJ The error description informs me that ArchiveurPerfsBJ.VNoteArchive (i.e. The event delegate) is unreachable because of its protection level. I don't know how to solve this problem so I have posted this message to get some help. .VNoteArchive += ArchiveurPerfsBJ_VNoteArchive; static void ArchiveurPerfsBJ_VNoteArchive( object emetteur VNoteArchiveEventArgs arguments) {...} static event EventHandler VNoteArchiveEventArgs > VNoteArchive;

David Rougier · Answer

Good suggestion. I did not precise any modifier to the class VNoteArchiveEventArgs and the class is located in a project different from the one containing the class EntreeConsole. I have given the public modifier to the class VNoteArchiveEventArgs and the problem is now resolved. Thanks for helping.

Vulpes · Answer

Well if it is public then I don't understand the error. Your code looks like text-book stuff. I've even tried to model the situation myself with the console app below but it compiles and works fine: using System; static class ArchiveurPerfBJ { public static event EventHandler VNoteArchive; public static void OnVNoteArchive() { if (VNoteArchive != null) VNoteArchive(null null); } } class VNoteArchiveEventArgs : EventArgs { } public static class EntreeConsole { static void Main() { ArchiveurPerfBJ.VNoteArchive += ArchiveurPerfsBJ_VNoteArchive; // fire event ArchiveurPerfBJ.OnVNoteArchive(); Console.ReadKey(); } private static void ArchiveurPerfsBJ_VNoteArchive(object emetteur VNoteArchiveEventArgs arguments) { Console.WriteLine(Hello from ArchiveurPerfsBJ_VNoteArchive); } } Incidentally where are you declaring the VNoteArchiveEventArgs class?

David Rougier · Answer

Sorry I did not check my message after posting and the code snippets are unreadable. I have reformated them as follows : Here is the declaration of the event delegate in the static class ArchiveurPerfsBJ : public static event EventHandler VNoteArchive; Here is the prototype of the callback method in the static class containing the main method : private static void ArchiveurPerfsBJ_VNoteArchive(object emetteur VNoteArchiveEventArgs arguments) {...} Here is the statement to affect the callback method to the event delegate. ArchiveurPerfBJ.VNoteArchive += ArchiveurPerfsBJ_VNoteArchive; This statement generates a before-execution error. I have written this statement in the main method. In response to Vulpes the event delegate VNoteArchive has been declared public and the static class ArchiveurPerfsBJ as well.

Vulpes · Answer

It sounds like VNoteArchive has not been declared to be either public or internal so that it can be accessed from EntreeConsole. If you haven't given it a modifier then it will be private by default.