 | CondensedCollectionExtensionsSumTSource Method (CondensedCollectionTSource, FuncTSource, Double) |
[This is preliminary documentation and is subject to change.]
Computes the sum of a CondensedCollection of double values that are obtained by invoking a transform
function on each element of the input sequence. Optimized for a CondensedCollection.
Namespace: Condensed.Linq
Assembly: Condensed (in Condensed.dll) Version: 0.1.0.0 (0.1.0.0)
Syntaxpublic static double Sum<TSource>( this CondensedCollection<TSource> source, Func<TSource, double> selector )
Parameters
- source
- Type: CondensedCondensedCollectionTSource
A CondensedCollection of values to calculate the sum of. - selector
- Type: SystemFuncTSource, Double
A transform function to apply to each element.
Type Parameters
- TSource
- The type of the elements of source.
Return Value
Type: DoubleThe sum of the sequence of values.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type CondensedCollectionTSource. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).Exceptions| Exception | Condition |
|---|---|
| ArgumentNullException | source or selector is null |
Remarks
This implementation of Sum() is specialized for a CondensedCollection and tries to
take advantage of the CondensedCollection's knowledge of unique values in order to improve performance.
If you would rather use the normal LINQ extension method then cast the CondensedCollection to an IListT
to use the SumTSource(IEnumerableTSource, FuncTSource, Double) implementation.
See Also