Expression.And Method (Expression, Expression)

Parameters

• left
  Type: System.Linq.Expressions.Expression
  A Expression to set the Left property equal to.

• right
  Type: System.Linq.Expressions.Expression
  A Expression to set the Right property equal to.

Return Value

Type: System.Linq.Expressions.BinaryExpression
A BinaryExpression that has the NodeType property equal to And and the Left and Right properties set to the specified values.

' Add the following directive to your file:
' Imports System.Linq.Expressions 

' This expression performs a logical AND operation
' on its two arguments. Both arguments must be of the same type,
' which can be Boolean or integer.             
Dim andExpr As Expression = Expression.And(
    Expression.Constant(True),
    Expression.Constant(False)
    )

' Print the expression.
outputBlock.Text &= andExpr.ToString() & vbCrLf

' The following statement first creates an expression tree,
' then compiles it, and then executes it.       
outputBlock.Text &=
    Expression.Lambda(Of Func(Of Boolean))(andExpr).Compile()() & vbCrLf
' This code example produces the following output:
'
' (True And False)
' False

// Add the following directive to your file:
// using System.Linq.Expressions;  

// This expression perfroms a logical AND operation
// on its two arguments. Both arguments must be of the same type,
// which can be boolean or integer.             
Expression andExpr = Expression.And(
    Expression.Constant(true),
    Expression.Constant(false)
);

// Print out the expression.
outputBlock.Text += andExpr.ToString() + "\n";

// The following statement first creates an expression tree,
// then compiles it, and then executes it.       
outputBlock.Text += Expression.Lambda<Func<bool>>(andExpr).Compile()() + "\n";

// This code example produces the following output:
//
// (True And False)
// False