vb 2008 method

14y2.1kVisual Basic .NET

In a visual basic 2008 console application, I need to split up some an extrmely large method into lgocial groups based upon the new logic I need to add. Thus I have the following questions:

1. If i keep the code the way it basically exists in a large method, how can I make the code go to the end of the method? Basically from my if statment certain code would happen and then I want to go to the end of the method.

2. From the place where I would do the if statement, I would break the large method into two methods. From this if statement, i would do the new code or setups the rest of the code into this new method using most of the existing logic. However when I setup this new method, how would I know what objects I need to pass to the new method?

3 Replies

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Vulpes14y ago
Accepted answer
That's right but I'd avoid using GoTo if you sensibly can - you can always avoid it but sometimes, when the code is deeply nested, it's not worth the hassle.

Anyway here's a simple example illustrating these points:

Imports System

Module Test

Sub Main()

Method1(2)
Console.WriteLine()
Method2(2)
Console.WriteLine()
Method3(2)
Console.ReadKey()

End Sub

Sub Method1(ByVal i As Integer) 'uses Return

If i > 1 Then

Console.WriteLine("{0} > 1", i)
Return

End If

Console.WriteLine("{0} <= 1", i)

End Sub

Sub Method2(ByVal i As Integer) 'uses Goto

If i > 1 Then

Console.WriteLine("{0} > 1", i)
GoTo Final

End If

Console.WriteLine("{0} <= 1", i)
Final:
i += 1
Console.WriteLine("{0} > 1", i)

End Sub

Sub Method3(ByVal i As Integer) 'avoids GoTo

If i > 1 Then

Console.WriteLine("{0} > 1", i)

Else

Console.WriteLine("{0} <= 1", i)

End If

i += 1
Console.WriteLine("{0} > 1", i)

End Sub

End Module

The output should be:

2 > 1

2 > 1
3 > 1

2 > 1
3 > 1
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dc14y ago
So you sare saying the following from your statement above:

1. If I place a 'return' statement in the code, the rest of the code in the method will not execute? The code will return to the line right after the method was called?

2. If I want to jump father down into the code, I can use a goto label? Can you give me an excample of this code I can use?
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Vulpes14y ago
If by 'end of method' you mean you want the method to return immediately to the caller, then just use the Return statement if it's a Sub or Return 'someValue' statement if it's a Function method.

If you mean that you want to go straight to the end of the method where there's some code to execute before the method finally returns, then I'd rearrange things to achieve that. For example, place the code which follows (up to where you want to jump to) in an Else statement or, if it's not that simple, place a label at the point where you want to jump to and use Goto 'label'.

The new method will need to have passed to it (as parameters):

1. Any parameters to the original method which it uses.

2. Any local variables already defined in the original method which it uses.
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