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i want duplicate class that consist of  string and class. I try copy the class  and paste  it to form by using clipboard ,but fail .how to do?thanks.my Code is below.
<Serializable()> _
Public Class Student
    Public FirstName As String
     Public mysubstudent As subStudent
     End Sub
End Class
Public Class subStudent
    Public width As Integer
    Public height As Integer
    Public left As Integer
    Public right As Integer
    Public objectname As String
End Class

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim emp As Student
        Dim mysub As New subStudent
        emp = New Student
        emp.FirstName = TextBox1.Text
        mysub.width = Button3.Width
        mysub.height = Button3.Height
        mysub.objectname = "Button"
        emp.mysubstudent = mysub
        Dim data_object As New DataObject
        data_object.SetData("Student1", emp)
        Clipboard.SetDataObject(data_object)
   End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles    
           Button2.Click
        Dim emp As Student
        Dim stu As subStudent
        Dim data_object As IDataObject = Clipboard.GetDataObject()
        If data_object.GetDataPresent("Student1") Then
             emp = DirectCast(data_object.GetData("Student1"), Student)
            ' fault here
            T3.Text = emp1.FirstName
            stu.height = emp.mysubstudent.height
            stu.width = emp.mysubstudent.width
            stu.objectname = emp.mysubstudent.objectname
            If stu.objectname = "Button" Then
                Dim mybut As New Button
                mybut.Width = stu.height
                mybut.Height = stu.width
                mybut.Text = "myb"
                mybut.Left = 100
                mybut.Top = 200
            End If
        End If
    End Sub
End Class
how to do it?thanks .
 
0
Cheng_sam
Asked:
Cheng_sam
2 Solutions
 
omegaomegaDeveloperCommented:
Hello, Cheng sam,

There seem to be a couple of problems in your code.  (Maybe it hasn't been copied correctly in your post.  Otherwise I don't know how you could get it to compile.)
1. There is an extraneous End Sub in your Student class.
2. Your Button2 Click event handler refers to a non-existent variable "emp1" at the point of your error.

I assume that neither of these faults appear in your actual code.  

I think that your actual problem is that your class subStudent is not marked as serializable.  Just add:

<Serializable()> _

in front of the line "Public Class subStudent" and I think you'll be able to move on to the next problem.  (That will be that you haven't yet assigned the variable "stu".)

Cheers,
Randy

0
 
Mike TomlinsonMiddle School Assistant TeacherCommented:
I agree with omegaomega...marking subStudent as serializable fixes the main problem.

Here I have done some MINOR refactoring of your code:
Public Class Form1
 
    <Serializable()> _
    Public Class Student
        Public FirstName As String
        Public mysubstudent As New subStudent
    End Class
 
    <Serializable()> _
    Public Class subStudent
        Public width As Integer
        Public height As Integer
        Public left As Integer
        Public right As Integer
        Public objectname As String
    End Class
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim emp As New Student
        emp.FirstName = TextBox1.Text
        emp.mysubstudent.width = Button3.Width
        emp.mysubstudent.height = Button3.Height
        emp.mysubstudent.objectname = "Button"
        Clipboard.SetDataObject(New DataObject("Student1", emp))
    End Sub
 
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        If Clipboard.ContainsData("Student1") Then
            Dim emp As Student = DirectCast(Clipboard.GetData("Student1"), Student)
            T3.Text = emp.FirstName
            If emp.mysubstudent.objectname = "Button" Then
                Dim mybut As New Button
                mybut.Width = emp.mysubstudent.width
                mybut.Height = emp.mysubstudent.height
                mybut.Text = "myb"
                mybut.Left = 100
                mybut.Top = 200
                Me.Controls.Add(mybut)
            End If
        End If
    End Sub
 
End Class

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0
 
Cheng_samAuthor Commented:
thank for omegaomega and Idle_Mind.It works good.Idle_Mind give the total code ,so he get more score.Thanks both.
0

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