GetAttribute

/// <summary>
/// Extension methods for dealing with an assembly
/// </summary>
public static class AssemblyExtensions
{
    /// <summary>
    /// Loads the configuration from assembly attributes
    /// </summary>
    /// <typeparam name="T">The type of the custom attribute to find.</typeparam>
    /// <param name="callingAssembly">The calling assembly to search.</param>
    /// <returns>The custom attribute of type T, if found.</returns>
    public static T GetAttribute<T>(this Assembly callingAssembly) 
			where T : Attribute
    {
        T result = null;

        // Try to find the configuration attribute for the default logger if it exists
        object[] configAttributes = Attribute.GetCustomAttributes(callingAssembly,
				typeof(T), false);

        // get just the first one
        if (!configAttributes.IsNullOrEmpty())
        {
            result = (T)configAttributes[0];
        }

        return result;
    }
}

var attribute = Assembly.GetExecutingAssembly().GetAttribute<InstallPerformanceCounterAttribute>();