Question

我的应用程序要求以不同的形式和子对象多次设置和检索变量。我希望不使用多次编写代码，而是希望使用循环来遍历变量并进行相应设置。下面的代码显示了我的设置菜单及其构建方式。我一直坚持根据存储为字符串的名称来设置变量（请参见下面的最后一个代码片段）。

下面的部分是菜单类。该位正常工作

Public Class MenuItem

    Public Name As String
    Public Type As TypeEnum

    Enum TypeEnum
        CheckBox
        ComboBox
        TextBox
    End Enum     

    Public Sub New()
    End Sub

End Class

Public Class Menu

    Public MenuItems() As MenuItem
    Public Name As String
    Public LinkedVariable as Object

    Public Sub New()
    End Sub

    Public Sub AddMenuItem(ByVal ItemName As String, _
                           ByVal ItemType As MenuItem.TypeEnum, _
                           ByVal ItemLinkedVariable as Object)   

        If MenuItems Is Nothing Then
            ReDim MenuItems(0)
        Else
            ReDim Preserve MenuItems(MenuItems.Length)
        End If
        MenuItems(MenuItems.Length - 1) = New MenuItem
        MenuItems(MenuItems.Length - 1).Name = ItemName
        MenuItems(MenuItems.Length - 1).Type = ItemType
        MenuItems(MenuItems.Length - 1).LinkedVariable = ItemLinkedVariable 
    End Sub

End Class

在主窗体类中构建菜单。该位正常工作

Public Class Form1
    Public Settings As New SettingsForm
    Public Sub CreateMenu()

        Settings.AddMenu("Menu1")

        Settings.Menus(0).AddMenuItem("CheckBoxA", MenuItem.TypeEnum.CheckBox, VariableA)
        Settings.Menus(0).AddMenuItem("TextBoxB", MenuItem.TypeEnum.TextBox, VariableB)
        Settings.Menus(0).AddMenuItem("TextBoxC", MenuItem.TypeEnum.TextBox, VariableC) 

        Settings.AddMenu("Menu2")

        Settings.Menus(1).AddMenuItem("CheckBoxD", MenuItem.TypeEnum.CheckBox, VariableD)
        Settings.Menus(1).AddMenuItem("TextBoxE", MenuItem.TypeEnum.TextBox, VariableE)

        'etc......      

        Settings.Build()

        Settings.Show()

    End Sub
End Class


Public Class SettingsForm
    Public Menus() As Menu

    Public VariableA As Boolean
    Public VariableB As String
    Public VariableC As String
    Public VariableD As Boolean
    Public VariableE As String

    Public Sub New()

        InitializeComponent()

    End Sub

    Public Sub Build()

        SettingsTabControl.TabPages.Clear()

        If Menus IsNot Nothing Then
            For i As Integer = 0 To Menus.Length - 1

                SettingsTabControl.TabPages.Add(Menus(i).Name)
                SettingsTabControl.TabPages(i).Name = Menus(i).Name & "TabPage"
                SettingsTabControl.TabPages(i).Text = Menus(i).Name

                AddSettingsItems(Menus(i), i)

            Next
        End If

    End Sub

    Public Sub AddSettingsItems(ByVal SelectedMenu As Menu, ByVal TabPageIndex As Integer)
        Dim y As Integer = 50
        Dim yinc As Integer = 25

        If SelectedMenu IsNot Nothing Then
            If SelectedMenu.MenuItems IsNot Nothing Then

                For i As Integer = 0 To SelectedMenu.MenuItems.Length - 1

                    Dim formObj As Object

                    'Specific Settings
                    Select Case SelectedMenu.MenuItems(i).Type
                        Case MenuItem.TypeEnum.CheckBox
                            formObj = New CheckBox
                        Case MenuItem.TypeEnum.ComboBox
                            formObj = New ComboBox                            
                        Case MenuItem.TypeEnum.TextBox
                            formObj = New TextBox
                            formObj.TextAlign = HorizontalAlignment.Right
                            formObj.BorderStyle = BorderStyle.FixedSingle
                    End Select

                    formObj.Name = SelectedMenu.MenuItems(i).Name
                    formObj.Location = New Point(25, y)
                    SettingsTabControl.TabPages(TabPageIndex).Controls.Add(formObj)

                    y = y + yinc
                Next
            End If
        End If
    End Sub
End Class

这是我坚持的目标，我希望能够从添加到SettingsTabControl的控件中设置变量A，B，C，D，E。但是我不知道如何将变量链接到每个MenuItem中的LinkedVariable对象。这是我所拥有的，但不起作用

Private Sub SettingsFromOkButton_Click(sender As Object, e As EventArgs) Handles OkButton.Click

    For m As Integer = 0 To Menus.Length - 1
        For i As Integer = 0 To Menus(m).MenuItems.Length

            Dim currentcontrol As Object = SettingsTabControl.TabPages(m).Controls(Menus(m).MenuItems(i).Name)

            Select Case Menus(m).MenuItems(i).Type
                Case MenuItem.TypeEnum.CheckBox
                    If currentcontrol.CheckedState = True Then
                        Menus(m).MenuItems(i).LinkedVariable = True
                    Else
                        Menus(m).MenuItems(i).LinkedVariable = False
                    End If
                Case MenuItem.TypeEnum.ComboBox


                Case MenuItem.TypeEnum.TextBox
                    Menus(m).MenuItems(i).LinkedVariable = currentcontrol.Text
            End Select

        Next
    Next

    MsgBox(VariableA & vbCrLf _
           VariableB & vbCrLf _
           VariableC & vbCrLf _
           VariableD & vbCrLf _
           VariableE & vbCrLf)

End Sub

Answer 1

我用了倒影

Dim Flags As BindingFlags = BindingFlags.GetField Or BindingFlags.Instance Or BindingFlags.Public
Dim fVar As System.Reflection.FieldInfo = Me.GetType.GetField(ObjectName, Flags)

If TypeOf SettingsTabControl.TabPages(TabPageIndex).Controls(CtrlName) Is TextBox Then
    ctrlValue = SettingsTabControl.TabPages(TabPageIndex).Controls(CtrlName).Text
ElseIf TypeOf SettingsTabControl.TabPages(TabPageIndex).Controls(CtrlName) Is CheckBox Then
    ctrlValue = CType(SettingsTabControl.TabPages(TabPageIndex).Controls(CtrlName), CheckBox).Checked
ElseIf TypeOf SettingsTabControl.TabPages(TabPageIndex).Controls(CtrlName) Is RadioButton Then
    ctrlValue = CType(SettingsTabControl.TabPages(TabPageIndex).Controls(CtrlName), RadioButton).Checked
End If

fVar.SetValue(Me, ctrlValue)

使用变量名作为字符串通过循环设置变量

1 个答案: