vb.net – 将此重复语句转换为循环

发布时间：2020-12-17 07:27:41 所属栏目：百科来源：网络整理

导读：本规范过于重复！我必须重新编写这个代码到二十个！你能帮助我把它转换成一个循环,它会从textbox1移动到2到3等等吗？ If CheckBox1.Checked = True Then frmLunchBoxMenu.LineNumber = frmLunchBoxMenu.LineNumber + 1 frmLunchBoxMenu.txtOrder.AppendText(

本规范过于重复！我必须重新编写这个代码到二十个！你能帮助我把它转换成一个循环,它会从textbox1移动到2到3等等吗？

If CheckBox1.Checked = True Then
        frmLunchBoxMenu.LineNumber = frmLunchBoxMenu.LineNumber + 1
        frmLunchBoxMenu.txtOrder.AppendText(frmLunchBoxMenu.LineNumber.ToString + ".) An order of " + CheckBox1.Text & Environment.NewLine)
    End If
    If CheckBox2.Checked = True Then
        frmLunchBoxMenu.LineNumber = frmLunchBoxMenu.LineNumber + 1
        frmLunchBoxMenu.txtOrder.AppendText(frmLunchBoxMenu.LineNumber.ToString + ".) An order of " + CheckBox2.Text & Environment.NewLine)
    End If        If CheckBox1.Checked = True Then
        frmLunchBoxMenu.LineNumber = frmLunchBoxMenu.LineNumber + 1
        frmLunchBoxMenu.txtOrder.AppendText(frmLunchBoxMenu.LineNumber.ToString + ".) An order of " + CheckBox1.Text & Environment.NewLine)
    End If
    If CheckBox2.Checked = True Then
        frmLunchBoxMenu.LineNumber = frmLunchBoxMenu.LineNumber + 1
        frmLunchBoxMenu.txtOrder.AppendText(frmLunchBoxMenu.LineNumber.ToString + ".) An order of " + CheckBox2.Text & Environment.NewLine)
    End If
    If CheckBox3.Checked = True Then
        frmLunchBoxMenu.LineNumber = frmLunchBoxMenu.LineNumber + 1
        frmLunchBoxMenu.txtOrder.AppendText(frmLunchBoxMenu.LineNumber.ToString + ".) An order of " + CheckBox3.Text & Environment.NewLine)
    End If
    If CheckBox4.Checked = True Then
        frmLunchBoxMenu.LineNumber = frmLunchBoxMenu.LineNumber + 1
        frmLunchBoxMenu.txtOrder.AppendText(frmLunchBoxMenu.LineNumber.ToString + ".) An order of " + CheckBox4.Text & Environment.NewLine)
    End If
    If CheckBox5.Checked = True Then
        frmLunchBoxMenu.LineNumber = frmLunchBoxMenu.LineNumber + 1
        frmLunchBoxMenu.txtOrder.AppendText(frmLunchBoxMenu.LineNumber.ToString + ".) An order of " + CheckBox5.Text & Environment.NewLine)
    End If

这是有效的,感谢帮助人员,问题是直接演员.解决了：

Public Class frmBeverages
Dim Range As Integer = 0
Private Sub btnSubmit_Click(sender As Object,e As EventArgs) Handles btnSubmit.Click
    While Range < 14
        Range = Range + 1
        Dim chk As CheckBox =
        DirectCast(Me.Controls("Checkbox" & CStr(Range)),CheckBox)
        If chk.CheckState = CheckState.Checked Then
            frmLunchBoxMenu.LineNumber = frmLunchBoxMenu.LineNumber + 1
            frmLunchBoxMenu.txtOrder.AppendText(CStr(frmLunchBoxMenu.LineNumber) & ".) An order of " & chk.Text & Environment.NewLine)
        End If
    End While
    Close()
End Sub
End Class

解决方法

Dim strOutput As String = ""
Dim intLineNumber As Integer = 0
For Each ctl As Control In Me.Controls
  If TypeOf ctl Is CheckBox Then
    Dim chk As CheckBox = DirectCast(ctl,CheckBox)
    If chk.Checked Then
      intLineNumber += 1
      strOutput &= intLineNumber.ToString + ".) An order of " + ctl.Text & vbCrLf
    End If
  End If
Next ctl
txtOrder.Text = strOutput

…但您也应该考虑使用CheckedListBox控件.这将允许您的菜单动态加载(从文本文件或数据库加载),您不需要管理多个复选框控件.

这是CheckedListBox版本……

Public Class frmLunchBoxMenu
  'Add a CheckedListBox,a Button,and a TextBox named txtOrder to the form
  Private Sub Form1_Load(sender As Object,e As EventArgs) Handles MyBase.Load
    CheckedListBox1.Items.Clear()
    CheckedListBox1.Items.Add("Hamburger")
    CheckedListBox1.Items.Add("Pizza")
    CheckedListBox1.Items.Add("Cola")
    CheckedListBox1.Items.Add("Chips")
    CheckedListBox1.Items.Add("Hot dog")
  End Sub


  Private Sub Button1_Click(sender As Object,e As EventArgs) Handles Button1.Click
    Dim strOutput As String = ""
    Dim intLineNumber As Integer = 0
    For i As Integer = 0 To CheckedListBox1.Items.Count - 1
      If CheckedListBox1.GetItemChecked(i) Then
        intLineNumber += 1
        strOutput &= intLineNumber.ToString + ".) An order of " + CheckedListBox1.Items(i).ToString & vbCrLf
      End If
    Next i
    txtOrder.Text = strOutput
  End Sub

End Class

（编辑：李大同）

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