/// <summary>
/// Gets the custom attribute instance from the parameter definition, or null.
/// </summary>
/// <returns>The custom attribute.</returns>
/// <param name="td">The type parameter to examine.</param>
/// <typeparam name="T">The type of attribute to find.</typeparam>
public static CustomAttribute GetAttribute <T>(this ParameterDefinition td)
{
return(td.GetAttribute(typeof(T)));
}