Or<T>(Expression<Func<T,Boolean>>,Expression<Func<T,Boolean>>) Method

Returns an expression which represents a conditional OR operation.

Syntax

Visual Basic
C#

'Declaration
 
<ExtensionAttribute()>
Public Overloads Shared Function Or(Of T)( _
   ByVal left As Expression(Of Func(Of T,Boolean)), _
   ByVal right As Expression(Of Func(Of T,Boolean)) _
) As Expression(Of Func(Of T,Boolean))

'Usage
 
Dim left As Expression(Of Func(Of T,Boolean))
Dim right As Expression(Of Func(Of T,Boolean))
Dim value As Expression(Of Func(Of T,Boolean))
 
value = PredicateBuilder.Or(Of T)(left, right)

[Extension()]
public static Expression<Func<T,bool>> Or<T>( 
   Expression<Func<T,bool>> left,
   Expression<Func<T,bool>> right
)

Parameters

left: First operand
right: Second operand

Type Parameters

T

Remarks

The resulting expression is an "OrElse" binary expression, where the second operand will be evaluated only if the first operand is true.

Example

public void OrQuery() {
  var mgr = new DomainModelEntityManager();
  Expression<Func<Customer, bool>> crit1 = c => c.Country.Equals("Mexico");
  Expression<Func<Customer, bool>> crit2 = c => c.CompanyName.StartsWith("A");

  // Where companyname starts with A or country = mexico
  var finalcrit = crit1.Or(crit2);
  var query = mgr.Customers.Where(finalcrit);
  var list = query.ToList();
}

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

PredicateBuilder Class
PredicateBuilder Members
Overload List