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DbExpressionBuilder.Where Method

.NET Framework 4.5

Creates a new DbFilterExpression that filters the elements in the given input set using the specified predicate.

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

public static DbFilterExpression Where(
	this DbExpression source,
	Func<DbExpression, DbExpression> predicate
)

Parameters

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

An expression that specifies the input set.

predicate
Type: System.Func<DbExpression, DbExpression>

A method representing the predicate to evaluate for each member of the input set. This method must produce an expression with a Boolean result type that provides the predicate logic.

Return Value

Type: System.Data.Common.CommandTrees.DbFilterExpression
A new DbQuantifierExpression that represents the Any operation.

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

source or predicate is null.

ArgumentNullException

The expression produced by predicate is null.

ArgumentException

The expression produced by predicate does not have a Boolean 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.

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