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.NET Forum / .NET Framework / New Users / December 2007Custom Attribute and Instance Sample?
I have a currently executing assembly with 3 types, they are all decorated with a Custom Attribute. Can anyone show a sample of how to find all of my Types in the current Assembly that have the attribute, and then put a New instance of each type in a List? Thanks. > I have a currently executing assembly with 3 types, they are all > decorated with a Custom Attribute. Can anyone show a sample of how to > find all of my Types in the current Assembly that have the attribute, > and then put a New instance of each type in a List? Assembly source = Assembly.GetExecutingAssembly(); List<object> list = new List(); foreach (Type type in source.GetTypes()) { if (type.GetCustomAttributes(typeof(MyAttribute), false).Length!=0) { list.Add(Activator.CreateInstance(type)); } }  SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet World class .NET training in the UK: http://iterativetraining.co.uk >> I have a currently executing assembly with 3 types, they are all >> decorated with a Custom Attribute. Can anyone show a sample of how to [quoted text clipped - 7 lines] > { > if (type.GetCustomAttributes(typeof(MyAttribute), false).Length!=0) You can use type.IsDefined(...) for this. Alun Harford > You can use type.IsDefined(...) for this. Oops, yes indeed. I thought there was a simpler way :) SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet World class .NET training in the UK: http://iterativetraining.co.uk >> You can use type.IsDefined(...) for this. > > Oops, yes indeed. I thought there was a simpler way :) Why they didn't call it HasCustomAttribute I don't know... Alun Harford > I have a currently executing assembly with 3 types, they are all > decorated with a Custom Attribute. Can anyone show a sample of how to > find all of my Types in the current Assembly that have the attribute, > and then put a New instance of each type in a List? C# 3: Type[] result = Assembly.GetExecutingAssembly().GetTypes() .Where(t=>t.IsDefined(typeof(MyAttibute), false) .Select(t=>Activator.CreateInstance(t)); > > I have a currently executing assembly with 3 types, they are all > > decorated with a Custom Attribute. Can anyone show a sample of how to [quoted text clipped - 6 lines] > .Where(t=>t.IsDefined(typeof(MyAttibute), false) > .Select(t=>Activator.CreateInstance(t)); The result type is wrong there, but hey, who's counting :) I prefer it as a query expression though: var result = from type in Assembly.GetExecutingAssembly().GetTypes() where type.IsDefined(typeof(MyAttribute), false) select Activator.CreateInstance(type); List<object> objects = result.ToList(); SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet World class .NET training in the UK: http://iterativetraining.co.uk >>> I have a currently executing assembly with 3 types, they are all >>> decorated with a Custom Attribute. Can anyone show a sample of how to [quoted text clipped - 7 lines] > > The result type is wrong there, but hey, who's counting :) That'll teach me for answering questions at 1am :-) Good catch! Alun Harford
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