Export (0) Print
Expand All
Expand Minimize

DbExpressionBuilder.IsNull Method

.NET Framework 4.5

Creates a new DbIsNullExpression that determines whether the specified argument is null.

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

public static DbIsNullExpression IsNull(
	this DbExpression argument


Type: System.Data.Common.CommandTrees.DbExpression

An expression that specifies the argument.

Return Value

Type: System.Data.Common.CommandTrees.DbIsNullExpression
A new DbIsNullExpression with the specified argument.

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).


argument is null.


argument has a collection result type.

.NET Framework

Supported in: 4.5

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

© 2014 Microsoft