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This article mainly introduces how VB.NET to achieve process overloading, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

VB.NET procedure overloading refers to defining a procedure in multiple versions with the same name and different parameter lists. The purpose of overloading is to define several closely related versions of the process without distinguishing them by name, which can be done by changing the parameter list.

VB.NET procedure overloading rules

Suppose you want to write a Sub process to advertise transactions based on the customer's balance, and you want to be able to reference the customer by name or by account. To do this, you can define two different Sub procedures, as shown in the following example:

Visual Basic

Sub postName (ByVal custName

As String, ByVal amount

As Single)

'Insert code to access

Customer record by

Customer name.

End Sub

Sub postAcct (ByVal custAcct

As Integer, ByVal

Amount As Single)

'Insert code to access

Customer record by account number.

End Sub

VB.NET process reload version

Another way is to overload a separate procedure name. You can use the Overloads keyword to define a version of the procedure for each parameter list, as follows:

Visual Basic

Overloads Sub post (ByVal

CustName As String, ByVal

Amount As Single)

'Insert code to access

Customer record by

Customer name.

End Sub

Overloads Sub post (ByVal

CustAcct As Integer

ByVal amount As Single)

'Insert code to access

Customer record by

Account number.

End Sub

Other VB.NET process overloads

If you also need to accept the transaction amount expressed in Decimal or Single, you can further overload the post to allow this change. If you did this for each overload in the example above, there would be four Sub procedures with the same name but four different signatures.

Advantages of VB.NET process overloading

The advantage of overloading procedures is that they make calls more flexible. To use the post procedure declared in the previous example, the calling code can obtain a customer identity of type String or Integer, and then call the same procedure in both cases. The following example illustrates this:

Visual Basic

Imports MSvb = Microsoft.

VisualBasic

Visual Basic

Dim customer As String

Dim accountNum As Integer

Dim amount As Single

Customer = MSVB.Interaction.

InputBox ("Enter customer name"

Or number ")

Amount = MSVB.Interaction.

InputBox ("Enter transaction"

Amount ")

Try

AccountNum = CInt (customer)

Call post (accountNum, amount)

Catch

Call post (customer, amount)

End Try

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