System.Xml.Serialization.TypeDesc.FindCommonBaseTypeDesc C# (CSharp) Method

        internal static TypeDesc FindCommonBaseTypeDesc(TypeDesc[] typeDescs)
        {
            if (typeDescs.Length == 0) return null;
            TypeDesc leastDerivedTypeDesc = null;
            int leastDerivedLevel = int.MaxValue;

            for (int i = 0; i < typeDescs.Length; i++)
            {
                int derivationLevel = typeDescs[i].Weight;
                if (derivationLevel < leastDerivedLevel)
                {
                    leastDerivedLevel = derivationLevel;
                    leastDerivedTypeDesc = typeDescs[i];
                }
            }
            while (leastDerivedTypeDesc != null)
            {
                int i;
                for (i = 0; i < typeDescs.Length; i++)
                {
                    if (!typeDescs[i].IsDerivedFrom(leastDerivedTypeDesc)) break;
                }
                if (i == typeDescs.Length) break;
                leastDerivedTypeDesc = leastDerivedTypeDesc.BaseTypeDesc;
            }
            return leastDerivedTypeDesc;
        }
    }