How do I read an attribute on a class at runtime?

by 
public string GetDomainName<T>()
{
    var dnAttribute = typeof(T).GetCustomAttributes(
        typeof(DomainNameAttribute), true
    ).FirstOrDefault() as DomainNameAttribute;
    if (dnAttribute != null)
    {
        return dnAttribute.Name;
    }
    return null;
}

UPDATE:

This method could be further generalized to work with any attribute:

public static class AttributeExtensions
{
    public static TValue GetAttributeValue<TAttribute, TValue>(
        this Type type, 
        Func<TAttribute, TValue> valueSelector) 
        where TAttribute : Attribute
    {
        var att = type.GetCustomAttributes(
            typeof(TAttribute), true
        ).FirstOrDefault() as TAttribute;
        if (att != null)
        {
            return valueSelector(att);
        }
        return default(TValue);
    }
}

and use like this:

string name = typeof(MyClass)
    .GetAttributeValue((DomainNameAttribute dna) => dna.Name);

More Related Contents:

  1. KeyValuePair with generic values [closed]
  2. Is there a constraint that restricts my generic method to numeric types?
  3. How do I clone a generic list in C#?
  4. Remove duplicates from a List in C#
  5. Why isn’t there generic variance for classes in C# 4.0?
  6. Get enum from enum attribute
  7. Exclude property from serialization via custom attribute (json.net)
  8. Partial generic type inference possible in C#?
  9. How enumerate all classes with custom class attribute?
  10. Making a generic property
  11. Why cannot C# generics derive from one of the generic type parameters like they can in C++ templates? [duplicate]
  12. How do I make the return type of a method generic?
  13. Partial type inference
  14. How to solve Operator ‘!=’ cannot be applied to operands of type ‘T’ and ‘T’ [duplicate]
  15. Why does the c# compiler emit Activator.CreateInstance when calling new in with a generic type with a new() constraint?
  16. .NET – Convert Generic Collection to DataTable
  17. Using Statement with Generics: using ISet = System.Collections.Generic.ISet
  18. SortedList, SortedDictionary and Dictionary
  19. How do I check if a given value is a generic list?
  20. Declare a generic type instance dynamically [duplicate]
  21. Creating a Math library using Generics in C#
  22. Accessing properties through Generic type parameter
  23. Why doesn’t C# support implied generic types on class constructors?
  24. Correct way to check if a type is Nullable [duplicate]
  25. The given key was not present in the dictionary. Which key?
  26. Checking type parameter of a generic method in C#
  27. Can you use “where” to require an attribute in c#?
  28. Get derived class type from a base’s class static method
  29. C# List: why you cannot do `List foo = new List();`
  30. How to use Activator to create an instance of a generic Type and casting it back to that type?

Leave a Comment