Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
Export (0) Print
Expand All

Expression::SubtractChecked Method (Expression, Expression, MethodInfo)

Creates a BinaryExpression that represents an arithmetic subtraction operation that has overflow checking.

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

public:
static BinaryExpression^ SubtractChecked(
	Expression^ left, 
	Expression^ right, 
	MethodInfo^ method
)

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.

method
Type: System.Reflection::MethodInfo

A MethodInfo to set the Method property equal to.

Return Value

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

ExceptionCondition
ArgumentNullException

left or right is nullptr.

ArgumentException

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

InvalidOperationException

method is nullptr and the subtraction operator is not defined for left.Type and right.Type.

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 nullptr.

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

The following rules determine the implementing method for the operation :

  • If method is not nullptr 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 subtraction operator, the MethodInfo that represents that method is the implementing method.

  • Otherwise, if left.Type and right.Type are numeric types, the implementing method is nullptr.

If the implementing method is not nullptr:

  • 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 nullptr:

  • 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 subtraction 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 subtraction operator.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
Show:
© 2015 Microsoft