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.
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.DbFunctionExpressionA 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. |