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EdmFunctions.Count Method

.NET Framework 4.6 and 4.5

Creates a DbFunctionExpression that invokes the canonical 'Count' function over the specified collection. The result type of the expression is Edm.Int32.

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

public static DbFunctionExpression Count(
	this DbExpression collection
)

Parameters

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

An expression that specifies the collection over which the count value should be computed.

Return Value

Type: System.Data.Common.CommandTrees.DbFunctionExpression
A new DbFunctionExpression that produces the count value.

Usage Note

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

collection

ArgumentException

collection

.NET Framework

Supported in: 4.6, 4.5
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