Custom Assembly Attributes

Question

I would like to know if I can define custom assembly attributes. Existing attributes are defined in the following way:

[assembly: AssemblyTitle("MyApplication")]  
[assembly: AssemblyDescription("This application is a sample application.")]  
[assembly: AssemblyCopyright("Copyright © MyCompany 2009")]

Is there a way I can do the following:

[assembly: MyCustomAssemblyAttribute("Hello World! This is a custom attribute.")]

Answer 1

Yes you can. We do this kind of thing.

   [AttributeUsage(AttributeTargets.Assembly)]
    public class MyCustomAttribute : Attribute {
       string someText;
       public MyCustomAttribute() { someText = string.Empty; }
       public MyCustomAttribute(string txt) { someText = txt; }
     ...
    }

To read use this kind of linq stmt.

    var attributes = assembly.GetCustomAttributes(typeof(MyCustomAttribute), false).Cast<MyCustomAttribute>();

Answer 2

Yes, use AttributeTargets.Assembly:

[AttributeUsage(AttributeTargets.Assembly)]
public class AssemblyAttribute : Attribute { ... }