Expression.And Expression.And Expression.And Expression.And Method

Definition

Creates a BinaryExpression that represents a bitwise AND operation.

Overloads

And(Expression, Expression) And(Expression, Expression) And(Expression, Expression) And(Expression, Expression)

Creates a BinaryExpression that represents a bitwise AND operation.

And(Expression, Expression, MethodInfo) And(Expression, Expression, MethodInfo) And(Expression, Expression, MethodInfo) And(Expression, Expression, MethodInfo)

Creates a BinaryExpression that represents a bitwise AND operation. The implementing method can be specified.

And(Expression, Expression) And(Expression, Expression) And(Expression, Expression) And(Expression, Expression)

Creates a BinaryExpression that represents a bitwise AND operation.

public:
 static System::Linq::Expressions::BinaryExpression ^ And(System::Linq::Expressions::Expression ^ left, System::Linq::Expressions::Expression ^ right);
public static System.Linq.Expressions.BinaryExpression And (System.Linq.Expressions.Expression left, System.Linq.Expressions.Expression right);
static member And : System.Linq.Expressions.Expression * System.Linq.Expressions.Expression -> System.Linq.Expressions.BinaryExpression
Public Shared Function And (left As Expression, right As Expression) As BinaryExpression

Parameters

left
Expression Expression Expression Expression

A Expression to set the Left property equal to.

right
Expression Expression Expression Expression

A Expression to set the Right property equal to.

Returns

A BinaryExpression that has the NodeType property equal to And and the Left and Right properties set to the specified values.

Exceptions

The bitwise AND operator is not defined for left.Type and right.Type.

Examples

The following code example shows how to create an expression that represents a logical AND operation on two Boolean values.

// 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.
Console.WriteLine(andExpr.ToString());

// The following statement first creates an expression tree,
// then compiles it, and then executes it.       
Console.WriteLine(Expression.Lambda<Func<bool>>(andExpr).Compile()());

// This code example produces the following output:
//
// (True And False)
// False
' 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.
Console.WriteLine(andExpr.ToString())

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

Remarks

The resulting BinaryExpression has the Method property set to the implementing method. The Type property is set to the type of the node. If the node is lifted, the IsLifted and IsLiftedToNull properties are both true. Otherwise, they are false. The Conversion property is null.

The following information describes the implementing method, the node type, and whether a node is lifted.

Implementing Method

The following rules determine the implementing method for the operation:

  • If the Type property of either left or right represents a user-defined type that overloads the bitwise AND operator, the MethodInfo that represents that method is the implementing method.

  • Otherwise, if left.Type and right.Type are integral or Boolean types, the implementing method is null.

Node Type and Lifted versus Non-Lifted

If the implementing method is not null:

  • If left.Type and right.Type are assignable to the corresponding argument types of the implementing method, the node is not lifted. The type of the node is the return type of the implementing method.

  • If the following two conditions are satisfied, the node is lifted and the type of the node is the nullable type that corresponds to the return type of the implementing method:

    • left.Type and right.Type are both value types of which at least one is nullable and the corresponding non-nullable types are equal to the corresponding argument types of the implementing method.

    • The return type of the implementing method is a non-nullable value type.

If the implementing method is null:

  • If left.Type and right.Type are both non-nullable, the node is not lifted. The type of the node is the result type of the predefined bitwise AND operator.

  • If left.Type and right.Type are both nullable, the node is lifted. The type of the node is the nullable type that corresponds to the result type of the predefined bitwise AND operator.

And(Expression, Expression, MethodInfo) And(Expression, Expression, MethodInfo) And(Expression, Expression, MethodInfo) And(Expression, Expression, MethodInfo)

Creates a BinaryExpression that represents a bitwise AND operation. The implementing method can be specified.

public:
 static System::Linq::Expressions::BinaryExpression ^ And(System::Linq::Expressions::Expression ^ left, System::Linq::Expressions::Expression ^ right, System::Reflection::MethodInfo ^ method);
public static System.Linq.Expressions.BinaryExpression And (System.Linq.Expressions.Expression left, System.Linq.Expressions.Expression right, System.Reflection.MethodInfo method);
static member And : System.Linq.Expressions.Expression * System.Linq.Expressions.Expression * System.Reflection.MethodInfo -> System.Linq.Expressions.BinaryExpression
Public Shared Function And (left As Expression, right As Expression, method As MethodInfo) As BinaryExpression

Parameters

left
Expression Expression Expression Expression

An Expression to set the Left property equal to.

right
Expression Expression Expression Expression

An Expression to set the Right property equal to.

method
MethodInfo MethodInfo MethodInfo MethodInfo

A MethodInfo to set the Method property equal to.

Returns

A BinaryExpression that has the NodeType property equal to And and the Left, Right, and Method properties set to the specified values.

Exceptions

method is not null and the method it represents returns void, is not static (Shared in Visual Basic), or does not take exactly two arguments.

method is null and the bitwise AND operator is not defined for left.Type and right.Type.

Remarks

The resulting BinaryExpression has the Method property set to the implementing method. The Type property is set to the type of the node. If the node is lifted, the IsLifted and IsLiftedToNull properties are both true. Otherwise, they are false. The Conversion property is null.

The following information describes the implementing method, the node type, and whether a node is lifted.

Implementing Method

The implementing method for the operation is chosen based on the following rules:

  • If method is not null and it represents a non-void, static (Shared in Visual Basic) method that takes two arguments, it is the implementing method for the node.

  • Otherwise, if the Type property of either left or right represents a user-defined type that overloads the bitwise AND operator, the MethodInfo that represents that method is the implementing method.

  • Otherwise, if left.Type and right.Type are integral or Boolean types, the implementing method is null.

Node Type and Lifted versus Non-Lifted

If the implementing method is not null:

  • If left.Type and right.Type are assignable to the corresponding argument types of the implementing method, the node is not lifted. The type of the node is the return type of the implementing method.

  • If the following two conditions are satisfied, the node is lifted and the type of the node is the nullable type that corresponds to the return type of the implementing method:

    • left.Type and right.Type are both value types of which at least one is nullable and the corresponding non-nullable types are equal to the corresponding argument types of the implementing method.

    • The return type of the implementing method is a non-nullable value type.

If the implementing method is null:

  • If left.Type and right.Type are both non-nullable, the node is not lifted. The type of the node is the result type of the predefined bitwise AND operator.

  • If left.Type and right.Type are both nullable, the node is lifted. The type of the node is the nullable type that corresponds to the result type of the predefined bitwise AND operator.

Applies to