EdmFunctions.StDev Method (DbExpression)

 

Creates a DbFunctionExpression that invokes the canonical 'StDev' function over the non-null members of the specified collection. The result type of the expression is Edm.Double.

Namespace:   System.Data.Entity.Core.Common.CommandTrees.ExpressionBuilder
Assembly:  EntityFramework (in EntityFramework.dll)

[SuppressMessageAttribute("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", 
	MessageId = "St")]
public static DbFunctionExpression StDev(
	this DbExpression collection
)

Parameters

collection
Type: System.Data.Entity.Core.Common.CommandTrees.DbExpression

An expression that specifies the collection for which the standard deviation should be computed.

Return Value

Type: System.Data.Entity.Core.Common.CommandTrees.DbFunctionExpression

A new DbFunctionExpression that produces the standard deviation value over non-null members of the collection.

Exception Condition
ArgumentNullException

collection is null.

ArgumentException

No overload of the canonical 'StDev' function accepts an argument with the result type of collection.