Question

我有一个名为“ Cheat_Enabled ”的var：

 Dim Cheat_Enabled As Boolean

一个名为“ CheckBox_Cheat ”的复选框，标记为“作弊”

现在我想做一个动态方法，通过拆分控件的名称（或其他东西）来改变var的值。

例如，像这样的东西（代码显然不起作用）：

Private Sub CheckBoxes_CheckedChanged(sender As Object, e As EventArgs) Handles _
    CheckBox_Cheat.CheckedChanged

    Dim SenderVarEquivalent As Object = _
    Me.variables.Find(sender.Tag & "_Enabled")(0)

    If sender.Checked Then SenderVarEquivalent = True _
    Else SenderVarEquivalent = False

End Sub

    ' Info:
    ' Sender.Tag = "Cheat"
    ' Sender.Name = "CheckBox_Cheat"
    ' VariableName = "Cheat_Enabled"

我认为这可以通过一个CType或DirectCast或GetObject完成，但我不知道该怎么做。

更新：

这是一个类似的简单代码，但它不是将ControlName转换为VariableName，而是将控制标记转换为Checkbox的ControlName对象：

Public Class Form1

    Dim Cheat_Enabled As Boolean = True

    Private Sub CheckBox_Cheat_CheckedChanged(sender As Object, e As EventArgs) Handles CheckBox_Cheat.CheckedChanged
        CType(Controls("CheckBox" & "_" & sender.tag), CheckBox).Checked = Cheat_Enabled
    End Sub

End Class

我希望如果我可以做同样的CType控件名来捕获变量名并使用它，例如像这样：

    Dim Cheat_Enabled As Boolean

Private Sub CheckBox_Cheat_CheckedChanged(sender As Object, e As EventArgs) Handles CheckBox_Cheat.CheckedChanged

    ' Sender.name is  : "CheckBox_Cheat"
    ' Sender.tag is   : "Cheat"
    ' Variable name is: "Cheat_Enabled"

    If sender.checked Then
         CType(Variable(sender.tag & "_Enabled"), Boolean) = True
    Else
         CType(Variable(sender.tag & "_Enabled"), Boolean) = False
    End If

End Sub

Answer 1

在MSDN中，您可以找到一个VB.Net示例，了解如何枚举给定类的所有成员：

Imports System
Imports System.Reflection
Imports Microsoft.VisualBasic

Class MyFindMembersClass

    Public Shared Sub Main()
        Dim objTest As New Object()
        Dim objType As Type = objTest.GetType()
        Dim arrayMemberInfo() As MemberInfo
        Try
            'Find all static or public methods in the Object 
            'class that match the specified name.
            arrayMemberInfo = objType.FindMembers(MemberTypes.Method, _
                              BindingFlags.Public Or BindingFlags.Static _
                              Or BindingFlags.Instance, _
                              New MemberFilter(AddressOf DelegateToSearchCriteria), _
                              "ReferenceEquals")

            Dim index As Integer
            For index = 0 To arrayMemberInfo.Length - 1
                Console.WriteLine("Result of FindMembers -" + ControlChars.Tab + _
                               arrayMemberInfo(index).ToString() + ControlChars.Cr)
            Next index
        Catch e As Exception
            Console.WriteLine("Exception : " + e.ToString())
        End Try
    End Sub 'Main

    Public Shared Function DelegateToSearchCriteria _
                            (ByVal objMemberInfo As MemberInfo, _
                             ByVal objSearch As Object) As Boolean
        ' Compare the name of the member function with the filter criteria.
        If objMemberInfo.Name.ToString() = objSearch.ToString() Then
            Return True
        Else
            Return False
        End If
    End Function 'DelegateToSearchCriteria 
End Class 'MyFindMembersClass

另一种方法是将所有布尔变量放入一个Dictionary对象中。这将允许您在不使用Reflection的情况下“按名称”访问布尔值。

插图示例：

Imports System.Collections.Generic

Module vbModule

Class Example

    Private _dictionary

    Public Sub New()
        ' Allocate and populate the field Dictionary.
        Me._dictionary = New Dictionary(Of String, Boolean)
        Me._dictionary.Add("v1", False)
        Me._dictionary.Add("v2", True)
    End Sub

    Public Function GetValue(name as String) As Boolean
        ' Return value from private Dictionary.
        Return Me._dictionary.Item(name)
    End Function

    Public Sub SetValue(name as String, val as Boolean)
        Me._dictionary.Item(name) = val
    End Sub

End Class

Sub Main()
    ' Allocate an instance of the class.
    Dim example As New Example

    ' Write a value from the class.
    Console.WriteLine(example.GetValue("v1"))
    Console.WriteLine(example.GetValue("v2"))
    example.SetValue("v1", true)
    Console.WriteLine(example.GetValue("v1"))
End Sub
End Module

将控件名称解析为变量名称

1 个答案: