Shulou(Shulou.com)06/02 Report--

In this issue, the editor will bring you about when the VB.NET operator process should be defined. The article is rich in content and analyzes and describes it from a professional point of view. I hope you can get something after reading this article.

Operators in the VB.NET programming language are a large group, but it is not easy to master all of them. Where the operator procedure is a series of VB.NET statements that define the behavior of standard operators (such as *, or And) on the class or structure you define. This is also known as operator overloading.

When to define VB.NET operator procedures

Operator procedures can be of one of the following types:

The definition of a unary operator, where the argument is the type of your class or structure.

The definition of a binary operator in which at least one parameter is the type of your class or structure.

A definition of a conversion operator where the argument is the type of your class or structure.

A definition of a conversion operator that returns the type of your class or structure.

Conversion operators are always unary operators, and you always use CType as the defined operator.

Declaration syntax

The VB.NET operator procedure is implicitly called using the operator symbols in the expression. Provide operands in the same way that you provide operands for predefined operators.

The syntax for implicitly calling an operator procedure is as follows:

Dim testStruct As structure name

Dim testNewStruct As structure name = testStruct operator symbol 10

Declaration and invocation interpretation

The following structure stores signed 128-bit integer values as high-order parts and low-order parts. It defines the + operator as adding two veryLong values and generating the resulting veryLong value.

Visual Basic Public Structure veryLong Dim highOrder As Long Dim lowOrder As Long Public Shared Operator + (ByVal v As veryLong, _ ByVal w As veryLong) As veryLong Dim sum As New veryLong sum = v Try sum.lowOrder + = w.lowOrder Catch ex As System.OverflowException sum.lowOrder-= (Long.MaxValue-w.lowOrder + 1) sum.highOrder + = 1 End Try sum.highOrder + = w.highOrder Return sum End Operator End Structure

The following example shows a typical call to the + operator defined on veryLong.

Visual Basic Dim v1, v2, v3 As veryLong v1.highOrder = 1 v1.lowOrder = Long.MaxValue v2.highOrder = 0 v2.lowOrder = 4 v3 = v1 + v2 above is when the VB.NET operator process shared by Xiaobian should be defined. If you happen to have similar doubts, please refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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