示例#1
0
        //fast path, that implementation detail does not really need to be API
        private static Array ArrayFromCollection(Type elementType, ICollection collection)
        {
            if (null == elementType)
            {
                throw new ArgumentNullException("elementType");
            }
            if (null == collection)
            {
                throw new ArgumentNullException("collection");
            }

            Array array = Array.CreateInstance(elementType, collection.Count);

            if (RuntimeServices.IsPromotableNumeric(Type.GetTypeCode(elementType)))
            {
                int i = 0;
                foreach (object item in collection)
                {
                    object value = RuntimeServices.CheckNumericPromotion(item).ToType(elementType, null);
                    array.SetValue(value, i);
                    ++i;
                }
            }
            else
            {
                collection.CopyTo(array, 0);
            }
            return(array);
        }
示例#2
0
        public static Array array(Type elementType, IEnumerable enumerable)
        {
            if (null == elementType)
            {
                throw new ArgumentNullException("elementType");
            }
            if (null == enumerable)
            {
                throw new ArgumentNullException("enumerable");
            }

                        #pragma warning disable 618 //obsolete
            ICollection collection = enumerable as ICollection;
            if (null != collection)                 //fast path
            {
                return(ArrayFromCollection(elementType, collection));
            }
                        #pragma warning restore 618

            List l = null;
            if (RuntimeServices.IsPromotableNumeric(Type.GetTypeCode(elementType)))
            {
                l = new List();
                foreach (object item in enumerable)
                {
                    object value = RuntimeServices.CheckNumericPromotion(item).ToType(elementType, null);
                    l.Add(value);
                }
            }
            else
            {
                l = new List(enumerable);
            }
            return(l.ToArray(elementType));
        }
示例#3
0
        public static Array array(Type elementType, IEnumerable enumerable)
        {
            if (null == enumerable)
            {
                throw new ArgumentNullException("enumerable");
            }
            if (null == elementType)
            {
                throw new ArgumentNullException("elementType");
            }

            // future optimization, check EnumeratorItemType of enumerable
            // and get the fast path whenever possible
            List l = null;

            if (RuntimeServices.IsPromotableNumeric(Type.GetTypeCode(elementType)))
            {
                l = new List();
                foreach (object item in enumerable)
                {
                    object value = RuntimeServices.CheckNumericPromotion(item).ToType(elementType, null);
                    l.Add(value);
                }
            }
            else
            {
                l = new List(enumerable);
            }
            return(l.ToArray(elementType));
        }