Expression::Subtract Method (Expression, Expression, MethodInfo)
Creates a BinaryExpression that represents an arithmetic subtraction operation that does not have overflow checking.
Assembly: System.Core (in System.Core.dll)
public: static BinaryExpression^ Subtract( Expression^ left, Expression^ right, MethodInfo^ method )
left or right is nullptr.
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.
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 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.
Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.