Compiler Error CS0579
Visual Studio 2012
Duplicate 'attribute' attribute
It is not possible to specify the same attribute more than once unless the attribute specifies AllowMultiple=true in its AttributeUsage.
The following example generates CS0579.
// CS0579.cs using System; public class MyAttribute : Attribute { } [AttributeUsage(AttributeTargets.All,AllowMultiple=true)] public class MyAttribute2 : Attribute { } public class z { [MyAttribute, MyAttribute] // CS0579 public void zz() { } [MyAttribute2, MyAttribute2] // OK public void zzz() { } public static void Main() { } }
