自定义类 vb.net 中未定义类型“Record”

Question

I'm following the thread below to create the multi-line combobox. I'm currently using Visual Studio 2019, and that thread is from 2013.

Any way for a combo box with 2 values per line?

Code that I copied:

    Public Class MultiLineComboBox : Inherits ComboBox
   Public Sub New()
      ' Call the base class.
      MyBase.New()

      ' Typing a value into this combobox won't make sense, so make it impossible.
      Me.DropDownStyle = ComboBoxStyle.DropDownList

      ' Set the height of each item to be twice its normal value
      ' (because we have two lines instead of one).
      Me.ItemHeight *= 2
   End Sub

   Protected Overrides Sub OnDrawItem(e As DrawItemEventArgs)
      ' Call the base class.
      MyBase.OnDrawItem(e)

      ' Fill the background.
      e.DrawBackground()

      ' Extract the Record object corresponding to the combobox item to be drawn.
      If (e.Index >= 0) Then
         Dim record As Record = DirectCast(Me.Items(e.Index), Record)

         ' Format the item's caption string.
         Dim caption As String = String.Format("ID: {0}{1}Name: {2}", record.UniqueID.ToString(), Environment.NewLine, record.Name)

         ' And then draw that string, left-aligned and vertically centered.
         TextRenderer.DrawText(e.Graphics, caption, e.Font, e.Bounds, e.ForeColor, TextFormatFlags.Left Or TextFormatFlags.VerticalCenter)
      End If

      ' Finally, draw the focus rectangle.
      e.DrawFocusRectangle()
   End Sub
End Class

I created a class named MultiLineComboBox, followed the instruction exactly, and it says "Type 'Record' is not defined." I have been searching for answers on the type "record" or DirectCast (eg https://docs.microsoft.com/en-us/dotnet/visual-basic/language-reference/operators/directcast-operator ), but none of them has helped me so far.

My reputation is currently <50 so I cannot leave a comment on the answer of that thread either. Could you all please help me with this?

(added tag visual-studio-2019 and .net-4.7.2 in case VS or .NET version is the issue)

Answer 1

Read the whole answer. The Record class is declared there; you need it, too, and you want to change the code to match the fields for your combobox.