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DbExpressionBuilder.Where Method

.NET Framework 4.6 and 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


Type: System.Data.Common.CommandTrees.DbExpression

An expression that specifies the input set.

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).


source or predicate is null.


The expression produced by predicate is null.


The expression produced by predicate does not have a Boolean result type.

.NET Framework

Supported in: 4.6, 4.5
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