Visual Basic button.click 如何返回到 If

Question

I have a problem, I want the program after pressing the button to check if there are files in different locations (I used if), and if this file not exists, I would download them (else) and that after downloading I would go back to if and continue the rest of the code.

If ComboBox2.SelectedItem = "1.12.2 Release" Then
    If My.Computer.FileSystem.DirectoryExists(natives & "\1.12.2\natives") Then
        launch = ("START CODE")
        Shell("cmd.exe @echo off /c" & launch)
        Me.Close()
    Else
        My.Computer.Network.DownloadFile("MY URL/natives.zip", natives & "\1.12.2\natives.zip")
        System.IO.Compression.ZipFile.ExtractToDirectory(natives & "\1.12.2\natives.zip", natives & "\1.12.2")
        My.Computer.FileSystem.DeleteFile(natives & "\1.12.2\natives.zip")
        Return

I want to add much more to this code, and I want first do this and I stayed here. In code I can see just one of maybe 5-7 folders to check

Answer 1

Create following logic

sub Main()
    if not CheckFolders() then
        if not DownloadFolders() then
            MessageBox.Show("Can't start program")
            Return
        end if
    end if

    ' Start your program here
end sub


function CheckFolders() as boolean
    ' check your folders here
end function

function DownloadFolders() as boolean
    ' download your folders here
end function

This way you separate logic of checking for files/folders from downloading and startup logic. And you can manipulate each separate component the way you want