VB2010(11)_循环语句

Public Class Form1

    Private Sub btnForNextLoop_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnForNextLoop.Click
        Dim intCount As Integer

        ClearList()
        For intCount = 1 To 5
            lstData.Items.Add("I'm item " & intCount.ToString & "in the list.")
        Next
    End Sub
    Private Sub ClearList()
        lstData.Items.Clear()
    End Sub

    Private Sub btnForNextLoopWithStep_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnForNextLoopWithStep.Click
        ClearList()
        For intcount As Integer = 4 To 62 Step 7
            lstData.Items.Add(intcount.ToString)
        Next
    End Sub

    Private Sub btnBackwarksForNextLoop_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnBackwarksForNextLoop.Click
        ClearList()
        For intCount As Integer = 10 To 1 Step -1
            lstData.Items.Add(intCount.ToString)
        Next
    End Sub

    Private Sub btnForEachLoop_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnForEachLoop.Click
        ClearList()
        For Each strFolder As String In My.Computer.FileSystem.GetDirectories("C:")
            lstData.Items.Add(strFolder)
        Next
    End Sub

    Private Sub btnDoUntilLoop_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDoUntilLoop.Click
        Dim objRandom As New Random
        Dim intRandomNumber As Integer = 0
        ClearList()
        '语句循环执行直到满足条件为止
        Do Until intRandomNumber = 10
            '生成一个0~24的随机整数
            intRandomNumber = objRandom.Next(25)
            lstData.Items.Add(intRandomNumber.ToString)
        Loop
    End Sub

    Private Sub btnDoUntilLoop2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDoUntilLoop2.Click
        Dim objRandom As New Random
        Dim intRandomNumber As Integer = 0
        ClearList()
        '语句循环执行直到满足条件为止
        Do
            '生成一个0~24的随机整数
            intRandomNumber = objRandom.Next(25)
            lstData.Items.Add(intRandomNumber.ToString)
        Loop Until intRandomNumber = 10
    End Sub
    Private Sub btnDoWhileLoop_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDoWhileLoop.Click
        Dim objRandom As New Random
        Dim intRandomNumber As Integer = 0

        ClearList()

        Do While intRandomNumber < 15
            intRandomNumber = objRandom.Next(25)
            lstData.Items.Add(intRandomNumber.ToString)
        Loop
    End Sub

    Private Sub btnDoWhileLoop2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDoWhileLoop2.Click
        Dim objRandom As New Random
        Dim intRandomNumber As Integer = 0

        ClearList()

        Do
            intRandomNumber = objRandom.Next(25)
            lstData.Items.Add(intRandomNumber.ToString)
        Loop While intRandomNumber < 15
    End Sub

    Private Sub btnNestedLoops_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnNestedLoops.Click
        ClearList()

        For intOuterLoop As Integer = 1 To 2
            For intInnerLoop As Integer = 1 To 3
                lstData.Items.Add(intOuterLoop.ToString & "," & intInnerLoop.ToString)
            Next
        Next

    End Sub

    Private Sub btnQuittingAForLoop_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnQuittingAForLoop.Click
        ClearList()

        For Each strFolder As String In My.Computer.FileSystem.GetDirectories("C:")
            lstData.Items.Add(strFolder)
            '检查是否存在C:program files文件夹
            If String.Compare(strFolder, "C:program files", True) = 0 Then
                MessageBox.Show("Fount it ,exiting the loop now.", "Loops")

                Exit For
            End If
        Next
    End Sub

    Private Sub btnQuittingADoLoop_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnQuittingADoLoop.Click
        Dim intCount As Integer = 0

        ClearList()

        Do While intCount < 10
            lstData.Items.Add(intCount.ToString)
            intCount += 1
            If intCount = 3 Then
                Exit Do
            End If
        Loop
    End Sub
End Class
 

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