Queryable.Sum Method (IQueryable(Int64))

Computes the sum of a sequence of Int64 values.

Namespace:  System.Linq
Assemblies:   System.Linq.Queryable (in System.Linq.Queryable.dll)
  System.Core (in System.Core.dll)

static member Sum : 
        source:IQueryable<int64> -> int64

Parameters

source
Type: System.Linq.IQueryable(Int64)

A sequence of Int64 values to calculate the sum of.

Return Value

Type: System.Int64
The sum of the values in the sequence.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IQueryable(Int64). 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).

ExceptionCondition
ArgumentNullException

source is a null reference (Nothing in Visual Basic).

OverflowException

The sum is larger than MaxValue.

The Sum(IQueryable(Int64)) method generates a MethodCallExpression that represents calling Sum(IQueryable(Int64)) itself as a constructed generic method. It then passes the MethodCallExpression to the Execute(TResult)(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

The query behavior that occurs as a result of executing an expression tree that represents calling Sum(IQueryable(Int64)) depends on the implementation of the type of the source parameter. The expected behavior is that it returns the sum of the values in source.

The following code example demonstrates how to use Sum(IQueryable(Single)) to sum the values of a sequence.

NoteNote

This code example uses an overload of this overloaded method that is different from the specific overload that this topic describes. To extend the example to this topic, substitute the elements of the source sequence with elements of the appropriate numerical type.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
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