Do...Loop Statement

Repeats the statements between the Do and the Loop statement while the condition is True or until the condition becomes True.

Синтаксис:

Do statement


  Do {While | Until} condition = True
  ' Do While: The statement block is repeated as long as the condition is true
  ' Do Until: The statement block is repeated as long as the condition is false
     statements
     [Exit Do]
     statements
  Loop

Do...Loop statement


  Do
     statements
     [Exit Do]
     statements
  ' Loop While: The statement block repeats as long as the condition is true
  ' Loop Until: The statement block repeats until the condition is true
  Loop {While | Until} condition = True

Параметры:

The Do...Loop statement executes a loop as long as, or until, a certain condition is True. The condition for exiting the loop must be entered following either the Do or the Loop statement. The above examples are valid combinations.

condition: A comparison, numeric or Basic expression, that evaluates to either True or False.

statements: Statements that you want to repeat while or until a condition is True.

Инструкция Exit Do используется для безусловного завершения цикла. Эту инструкцию можно добавлять в любое место инструкции Do...Loop. Также можно определить условие выхода, используя структуру If...Then следующим образом:


  Do...
     statements
     If condition = True Then Exit Do
     statements
  Loop...

Пример:


Sub ExampleDoLoop
    Dim sFile As String
    Dim sPath As String
    sPath = "c:\"
    sFile = Dir$( sPath ,22)
    If sFile <> "" Then
        Do
            MsgBox sFile
            sFile = Dir$
        Loop Until sFile = ""
    End If
End Sub

For, Select Case or While statements

Iif or Switch functions