次の方法で共有

  • [アーティクル]

Expression.Power Method (Expression, Expression)

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Creates a BinaryExpression that represents raising a number to a power.

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

Syntax

'Declaration
Public Shared Function Power ( _
    left As Expression, _
    right As Expression _
) As BinaryExpression

public static BinaryExpression Power(
    Expression left,
    Expression right
)

Parameters

Return Value

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

Exceptions

Exception Condition
ArgumentNullException

left or right is nulla null reference (Nothing in Visual Basic).
InvalidOperationException

The exponentiation operator is not defined for left.Type and right.Type.

-or-

left.Type and/or right.Type are not Double.

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 nulla null reference (Nothing in Visual Basic).

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 exponentiation operator, the MethodInfo that represents that method is the implementing method.

  • Otherwise, if left.Type and right.Type are both Double, the implementing method is Pow.

Node Type and Lifted versus Non-Lifted

  • 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.

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.