Serialize a class Inheriting from an ISerializable Class

Friday, September 29, 2006 10:10 AM

Mazzica

Hi,

I want to serialize my custom class derived from Windows Forms TreeNode. TreeNode already Implements the ISerealizable interface

I already tried 2 solutions but didnt wok :

1) Override Serialize and Deserialize methods : didint work I got this exception The constructor to deserialize an object of type 'ConsoleApplication1.MyTreeNode' was not found. I dont know how to deserialize my Nodes back by defining this constructor. Then why the method Deserialize id not Called ? (I tested with a breakpoint) .this is my code

Code :

<Serializable()> Public Class MyTreeNode
 Inherits TreeNode

 Public m_id As Integer

 Public Sub New()
 End Sub

 Public Sub New(ByVal id As Integer)
 m_id = id
 End Sub

 Protected Overrides Sub Serialize(ByVal si As System.Runtime.Serialization.SerializationInfo, ByVal context As System.Runtime.Serialization.StreamingContext)
 MyBase.Serialize(si, context)
 si.AddValue("id", m_id)
 End Sub

 Protected Overrides Sub Deserialize(ByVal serializationInfo As System.Runtime.Serialization.SerializationInfo, ByVal context As System.Runtime.Serialization.StreamingContext)
 MyBase.Deserialize(serializationInfo, context)
 m_id = DirectCast(serializationInfo.GetValue("id", GetType(Integer)), Integer)
 End Sub

End Class

2)Implementing ISerializable again and build the Serialization from scratch : this Solution is working well but got Exceptions when working with a Hierarchical TreeNode . this is my code :

Code :

<Serializable()> Public Class MyTreeNode
 Inherits TreeNode
 Implements ISerializable

 Public m_id As Integer

 Public Sub New()

 End Sub

 Public Sub New(ByVal id As Integer)
 m_id=id
 End Sub

 Protected Sub New(ByVal si As SerializationInfo, ByVal context As StreamingContext)
 Dim j As Integer = 1
 m_id = CType(si.GetValue("id", GetType(Integer)), Integer)
 Dim o As Object
 Dim i As Integer = 1
 While i <= (si.MemberCount - j)
 o = si.GetValue(i.ToString, GetType(Object))
 Nodes.Add(CType(o, TreeNode))
 i += 1
 End While
 End Sub

 Public Overridable Sub GetObjectData(ByVal si As SerializationInfo, ByVal context As StreamingContext)
 si.AddValue("id", m_id)
 Dim i As Integer = 1
 For Each o As Object In Nodes
 If o IsNot Nothing Then
 si.AddValue(i.ToString, o)
 i += 1
 End If
 Next
 End Sub
End Class

Well, hope that I'll fix my issue from your answers . Thanks In Advance.

All Replies

Friday, September 29, 2006 11:52 AMLucian Bargaoanu

0
For no 1 add a constructor like

Protected Sub New(ByVal si As SerializationInfo, ByVal context As StreamingContext)

and call the base constructor with those parameters.
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