Expression.Decrement Method

Definition

Namespace:

System.Linq.Expressions

Assembly:

System.Linq.Expressions.dll

Creates a UnaryExpression that represents the decrementing of the expression by 1.

Overloads

Decrement(Expression)	Creates a UnaryExpression that represents the decrementing of the expression by 1.
Decrement(Expression, MethodInfo)	Creates a UnaryExpression that represents the decrementing of the expression by 1.

Decrement(Expression)

Source:

UnaryExpression.cs

Creates a UnaryExpression that represents the decrementing of the expression by 1.

public static System.Linq.Expressions.UnaryExpression Decrement (System.Linq.Expressions.Expression expression);

Parameters

expression

Expression

An Expression to decrement.

Returns

UnaryExpression

A UnaryExpression that represents the decremented expression.

Examples

The following code example shows how to create an expression that subtracts 1 from a given value.

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

double num = 5.5;

// This expression represents a decrement operation
// that subtracts 1 from a value.
Expression decrementExpr = Expression.Decrement(
                            Expression.Constant(num)
                        );

// Print expression.
Console.WriteLine(decrementExpr.ToString());

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

// The value of the variable did not change,
// because the expression is functional.
Console.WriteLine("object: " + num);

// This code example produces the following output:
//
// Decrement(5.5)
// 4.5
// object: 5.5

Remarks

This expression is functional and does not change the value of the object passed to it.

Decrement(Expression, MethodInfo)

Source:

UnaryExpression.cs

Creates a UnaryExpression that represents the decrementing of the expression by 1.

public static System.Linq.Expressions.UnaryExpression Decrement (System.Linq.Expressions.Expression expression, System.Reflection.MethodInfo? method);

Parameters

expression

Expression

An Expression to decrement.

method

MethodInfo

A MethodInfo that represents the implementing method.

Returns

UnaryExpression

A UnaryExpression that represents the decremented expression.

Remarks

This expression is functional and does not change the value of the object passed to it.