CondensedCollectionExtensionsSum Method (CondensedCollectionNullableDouble)

[This is preliminary documentation and is subject to change.]

Computes the sum of a sequence of nullable double values. Optimized for a CondensedCollection.

Namespace: Condensed.Linq
Assembly: Condensed (in Condensed.dll) Version: 0.1.0.0 (0.1.0.0)

Syntax

public static Nullable<double> Sum(
	this CondensedCollection<Nullable<double>> source
)

<ExtensionAttribute>
Public Shared Function Sum ( 
	source As CondensedCollection(Of Nullable(Of Double))
) As Nullable(Of Double)

public:
[ExtensionAttribute]
static Nullable<double> Sum(
	CondensedCollection<Nullable<double>>^ source
)

[<ExtensionAttribute>]
static member Sum : 
        source : CondensedCollection<Nullable<float>> -> Nullable<float>

Parameters

source: Type: CondensedCondensedCollectionNullableDouble
A CondensedCollection of nullable double values to calculate the sum of.

Return Value

Type: NullableDouble
The 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 CondensedCollectionNullableDouble. 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 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 Sum(IEnumerableNullableDouble) implementation.

Reference

CondensedCollectionExtensions Class

Sum Overload

Condensed.Linq Namespace