System.Runtime.Serialization.SerializationEvents.GetMethodsWithAttribute C# (CSharp) Method

        private List<MethodInfo> GetMethodsWithAttribute(Type attribute, Type t)
        {
            List<MethodInfo> mi = null;

            // Traverse the hierarchy to find all methods with the particular attribute
            Type baseType = t;
            while (baseType != null && baseType != typeof(object))
            {
                // Get all methods which are declared on this type, instance and public or nonpublic
                MethodInfo[] mis = baseType.GetMethods(BindingFlags.DeclaredOnly | BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public);
                foreach (MethodInfo m in mis)
                {
                    // For each method find if attribute is present, the return type is void and the method is not virtual
                    if (m.IsDefined(attribute, false))
                    {
                        if (mi == null) mi = new List<MethodInfo>();
                        mi.Add(m);
                    }
                }
                baseType = baseType.BaseType;
            }
            mi?.Reverse(); // We should invoke the methods starting from base

            return mi;
        }