What is the name of the default delegate in C# which takes no parameters and returns void? I remember there existed such a delegate but I don't remember its name.
Prior to .NET 3.5, it was fairly common to declare your own. Now, Action
is a good candidate, but ThreadStart
was commonly used (fairly confusingly), or MethodInvoker
if you were already referencing winforms.
A quick test (note, running in .NET 4.0, using just some libraries - so not exhaustive):
var qry = from asm in AppDomain.CurrentDomain.GetAssemblies()
from type in asm.GetTypes()
where type.IsSubclassOf(typeof(Delegate))
let method = type.GetMethod("Invoke")
where method != null && method.ReturnType == typeof(void)
&& method.GetParameters().Length == 0
orderby type.AssemblyQualifiedName
select type.AssemblyQualifiedName;
foreach (var name in qry) Console.WriteLine(name);
shows some more candidates:
System.Action, mscorlib...
System.CrossAppDomainDelegate, mscorlib...
System.IO.Pipes.PipeStreamImpersonationWorker, System.Core...
System.Linq.Expressions.Compiler.LambdaCompiler+WriteBack, System.Core...
System.Net.UnlockConnectionDelegate, System...
System.Runtime.Remoting.Contexts.CrossContextDelegate, mscorlib...
System.Threading.ThreadStart, mscorlib...
System.Windows.Forms.AxHost+AboutBoxDelegate, System.Windows.Forms...
System.Windows.Forms.MethodInvoker, System.Windows.Forms...
There are several such delgates, but I think you are looking for Action
. One other option is MethodInvoker
(in System.Windows.Forms).
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