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Expression.Decrement Method (Expression)

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

Namespace:  System.Linq.Expressions
Assembly:  System.Core (in System.Core.dll)

public static UnaryExpression Decrement(
	Expression expression
)

Parameters

expression
Type: System.Linq.Expressions.Expression
An Expression to decrement.

Return Value

Type: System.Linq.Expressions.UnaryExpression
A UnaryExpression that represents the decremented expression.

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

The following code example shows how to create an expression that substracts 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


.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

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

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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