Question

Is it possible to create an attribute that can be initialized with a variable number of arguments?

For example:

[MyCustomAttribute(new int[3,4,5])]  // this doesn't work public MyClass ... 

Answer 1

Attributes will take an array. Though if you control the attribute, you can also use params instead (which is nicer to consumers, IMO):

class MyCustomAttribute : Attribute {     public int[] Values { get; set; }      public MyCustomAttribute(params int[] values) {        this.Values = values;     } }  [MyCustomAttribute(3, 4, 5)] class MyClass { } 

Your syntax for array creation just happens to be off:

class MyCustomAttribute : Attribute {     public int[] Values { get; set; }      public MyCustomAttribute(int[] values) {         this.Values = values;     } }  [MyCustomAttribute(new int[] { 3, 4, 5 })] class MyClass { }