public static IIterable <decimal?> SumMany(this IIterable <decimal?> source)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
var linkIterable = source as ILinkIterable <decimal?>;
if (linkIterable != null)
{
return(linkIterable.Sum());
}
return(new LinkIterable <decimal?, decimal?>(source, Iterator.Sum(default(IIteratorLink <decimal?, decimal?>))));
}
public ILinkIterable <TResult> Sum()
{
Type type = typeof(TResult);
Type underlyingType = Nullable.GetUnderlyingType(type);
bool nullable;
TypeCode typeCode;
if (underlyingType != null)
{
nullable = true;
typeCode = Type.GetTypeCode(underlyingType);
}
else
{
nullable = false;
typeCode = Type.GetTypeCode(type);
}
switch (typeCode)
{
case TypeCode.Int32:
return(nullable ? (ILinkIterable <TResult>)(object) new LinkIterable <TSource, int?>(iterable, Iterator.Sum((IIteratorLink <TSource, int?>) this.link)) : (ILinkIterable <TResult>)(object) new LinkIterable <TSource, int>(iterable, Iterator.Sum((IIteratorLink <TSource, int>) this.link)));
case TypeCode.Int64:
return(nullable ? (ILinkIterable <TResult>)(object) new LinkIterable <TSource, long?>(iterable, Iterator.Sum((IIteratorLink <TSource, long?>) this.link)) : (ILinkIterable <TResult>)(object) new LinkIterable <TSource, long>(iterable, Iterator.Sum((IIteratorLink <TSource, long>) this.link)));
case TypeCode.Single:
return(nullable ? (ILinkIterable <TResult>)(object) new LinkIterable <TSource, float?>(iterable, Iterator.Sum((IIteratorLink <TSource, float?>) this.link)) : (ILinkIterable <TResult>)(object) new LinkIterable <TSource, float>(iterable, Iterator.Sum((IIteratorLink <TSource, float>) this.link)));
case TypeCode.Double:
return(nullable ? (ILinkIterable <TResult>)(object) new LinkIterable <TSource, double?>(iterable, Iterator.Sum((IIteratorLink <TSource, double?>) this.link)) : (ILinkIterable <TResult>)(object) new LinkIterable <TSource, double>(iterable, Iterator.Sum((IIteratorLink <TSource, double>) this.link)));
case TypeCode.Decimal:
return(nullable ? (ILinkIterable <TResult>)(object) new LinkIterable <TSource, decimal?>(iterable, Iterator.Sum((IIteratorLink <TSource, decimal?>) this.link)) : (ILinkIterable <TResult>)(object) new LinkIterable <TSource, decimal>(iterable, Iterator.Sum((IIteratorLink <TSource, decimal>) this.link)));
default:
throw new NotImplementedException();
}
}
