Derived Dictionary serialization: please help me find the error in this simple code snippet

[pamela fluente]

Hi, please find below a very simple code snippet which is giving me
the following error:

System.Runtime. Serialization.S erializationExc eption was unhandled
Message="The constructor to deserialize an object of type
'WindowsApplica tion10.Form1+Di ctionaryExt`2[System.String,W indowsApplicati on10.Form1+What everClass]'
was not found."
Source="mscorli b"

You can just past the snippet on any form with a button.

Could anyone please point out how I can correct the code below.
I must be missing something simple, but I can't see what.
How do I specify the "deserializatio n constructor"?

Thanks.
PS
Also what is " DictionaryExt`2 ", there is no symbol with such a name
in the snippet !?

------------------------------ CODE
--------------------------------------------------

using System;
using System.Collecti ons.Generic;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows. Forms;

namespace WindowsApplicat ion10
{
public partial class Form1 : Form
{
public Form1()
{
InitializeCompo nent();
}

private void button1_Click(o bject sender, EventArgs e)
{
DictionaryExt<s tring, WhateverClassMy DictionaryExt = new
DictionaryExt<s tring,
WhateverClass>( StringComparer. InvariantCultur eIgnoreCase);
//Serialization
DictionaryExt<s tring, WhateverClassCl one =
(DictionaryExt< string,
WhateverClass>) CloneObjectInMe mory(MyDictiona ryExt);
}
public object CloneObjectInMe mory(object MyObject)
{
using (System.IO.Memo ryStream MemoryStream = new
System.IO.Memor yStream()) {
{
new
System.Runtime. Serialization.F ormatters.Binar y.BinaryFormatt er().Serialize( MemoryStream,
MyObject);
MemoryStream.Po sition = 0;
return new
System.Runtime. Serialization.F ormatters.Binar y.BinaryFormatt er().Deserializ e(MemoryStream) ;
}
}
}

[Serializable()]
public class DictionaryExt<K ey, value:
System.Collecti ons.Generic.Dic tionary<Key, value>
{

public DictionaryExt(I EqualityCompare r<KeyIEqualityC omparer)
: base(IEqualityC omparer)
{
}
}

public class WhateverClass
{
public string Greeting = "Hi";
public int Age;
}

}
}

[Ollie Riches]

if you want a serializable (xml) dictionary why not try

http://weblogs.asp.net/pwelter34/arc...03/444961.aspx

HTH

Ollie Riches

"pamela fluente" <pa***********@ libero.itwrote in message
news:11******** **************@ a75g2000cwd.goo glegroups.com.. .

>
Hi, please find below a very simple code snippet which is giving me
the following error:

System.Runtime. Serialization.S erializationExc eption was unhandled
Message="The constructor to deserialize an object of type
'WindowsApplica tion10.Form1+Di ctionaryExt`2[System.String,W indowsApplicati on10.Form1+What everClass]'
was not found."
Source="mscorli b"

You can just past the snippet on any form with a button.

Could anyone please point out how I can correct the code below.
I must be missing something simple, but I can't see what.
How do I specify the "deserializatio n constructor"?

Thanks.
PS
Also what is " DictionaryExt`2 ", there is no symbol with such a name
in the snippet !?

------------------------------ CODE
--------------------------------------------------

using System;
using System.Collecti ons.Generic;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows. Forms;

namespace WindowsApplicat ion10
{
public partial class Form1 : Form
{
public Form1()
{
InitializeCompo nent();
}

private void button1_Click(o bject sender, EventArgs e)
{
DictionaryExt<s tring, WhateverClassMy DictionaryExt = new
DictionaryExt<s tring,
WhateverClass>( StringComparer. InvariantCultur eIgnoreCase);
//Serialization
DictionaryExt<s tring, WhateverClassCl one =
(DictionaryExt< string,
WhateverClass>) CloneObjectInMe mory(MyDictiona ryExt);
}
public object CloneObjectInMe mory(object MyObject)
{
using (System.IO.Memo ryStream MemoryStream = new
System.IO.Memor yStream()) {
{
new
System.Runtime. Serialization.F ormatters.Binar y.BinaryFormatt er().Serialize( MemoryStream,
MyObject);
MemoryStream.Po sition = 0;
return new
System.Runtime. Serialization.F ormatters.Binar y.BinaryFormatt er().Deserializ e(MemoryStream) ;
}
}
}

[Serializable()]
public class DictionaryExt<K ey, value:
System.Collecti ons.Generic.Dic tionary<Key, value>
{

public DictionaryExt(I EqualityCompare r<KeyIEqualityC omparer)
: base(IEqualityC omparer)
{
}
}

public class WhateverClass
{
public string Greeting = "Hi";
public int Age;
}

}
}

[pamela fluente]

On 12 Feb, 15:57, "Ollie Riches" <ollie_ric...@h otmail.comwrote :

if you want a serializable (xml) dictionary why not try

http://weblogs.asp.net/pwelter34/arc...03/444961.aspx

Thanks Ollie ,

as you can see I am doing *binary* serialization, not XML.

In any case, I need to understand well the problem here, because
actually this is
just an example of several colllections I am deriving and that have
the same issue.

So what's the real problem here and what's the code correction ?

Any help ?
-Pam

[Ollie Riches]

you aree going to require a binary deserialization constructor as well as an
implementation of the interface method GetObjectData() on your dictionary
class.

a vb.net example

http://www.knowdotnet.com/articles/e...alization.html

HTH

Ollie Riches

"pamela fluente" <pa***********@ libero.itwrote in message
news:11******** **************@ h3g2000cwc.goog legroups.com...

On 12 Feb, 15:57, "Ollie Riches" <ollie_ric...@h otmail.comwrote :

>if you want a serializable (xml) dictionary why not try

http://weblogs.asp.net/pwelter34/arc...03/444961.aspx

Thanks Ollie ,

as you can see I am doing *binary* serialization, not XML.

In any case, I need to understand well the problem here, because
actually this is
just an example of several colllections I am deriving and that have
the same issue.

So what's the real problem here and what's the code correction ?

Any help ?
-Pam

[pamela fluente]

On 12 Feb, 15:57, "Ollie Riches" <ollie_ric...@h otmail.comwrote :

if you want a serializable (xml) dictionary why not try

http://weblogs.asp.net/pwelter34/arc...03/444961.aspx

HTH

Ollie Riches

Thanks Ollie ,

I have been serializing several objects and I know serialization
basics.

Before I used collections such us hashtables, or Sorted List and I
never had any problem.

Here I am not clear what is the problem Why a typed collection needs a
constructor
while a not typed one doesn't ? It would seem to me that a typed
collection should store more information.

So actually I am lost here, and the examples I have seen so far do not
spread any light ! :-(

Does anyone have an example to understand what is going on here ?
Can anyone show the actual code corrections to my simple snippet ?

-Pam

[PhilipDaniels]

On 12 Feb 2007 07:59:03 -0800, "pamela fluente"
<pa***********@ libero.itwrote:

>On 12 Feb, 15:57, "Ollie Riches" <ollie_ric...@h otmail.comwrote :

>if you want a serializable (xml) dictionary why not try

http://weblogs.asp.net/pwelter34/arc...03/444961.aspx

HTH

Ollie Riches

Thanks Ollie ,

I have been serializing several objects and I know serialization
basics.

Before I used collections such us hashtables, or Sorted List and I
never had any problem.

Here I am not clear what is the problem Why a typed collection needs a
constructor
while a not typed one doesn't ? It would seem to me that a typed
collection should store more information.

So actually I am lost here, and the examples I have seen so far do not
spread any light ! :-(

Does anyone have an example to understand what is going on here ?
Can anyone show the actual code corrections to my simple snippet ?

-Pam

Couple of thoughts:

Doesn't deserialization always require a parameterless constructor?
Your class doesn't have one. However, adding one doesn't fix the
problem I am afraid!

I suspect that somehow you need to tell deserialize the type
parameters used to instantiate the generic. There must be some code
out on the net that does that. This might be a good starting point
http://groups.google.com/group/micro...3ca1777cf82674

--
Philip Daniels

[Ollie Riches]

Phil, you only need a parameterless constructor for xml serialisation.

Ollie Riches
<Ph***********@ foo.comwrote in message
news:1f******** *************** *********@4ax.c om...

On 12 Feb 2007 07:59:03 -0800, "pamela fluente"
<pa***********@ libero.itwrote:

>>On 12 Feb, 15:57, "Ollie Riches" <ollie_ric...@h otmail.comwrote :

>>if you want a serializable (xml) dictionary why not try

http://weblogs.asp.net/pwelter34/arc...03/444961.aspx

HTH

Ollie Riches

Thanks Ollie ,

I have been serializing several objects and I know serialization
basics.

Before I used collections such us hashtables, or Sorted List and I
never had any problem.

Here I am not clear what is the problem Why a typed collection needs a
constructor
while a not typed one doesn't ? It would seem to me that a typed
collection should store more information.

So actually I am lost here, and the examples I have seen so far do not
spread any light ! :-(

Does anyone have an example to understand what is going on here ?
Can anyone show the actual code corrections to my simple snippet ?

-Pam

Couple of thoughts:

Doesn't deserialization always require a parameterless constructor?
Your class doesn't have one. However, adding one doesn't fix the
problem I am afraid!

I suspect that somehow you need to tell deserialize the type
parameters used to instantiate the generic. There must be some code
out on the net that does that. This might be a good starting point
http://groups.google.com/group/micro...3ca1777cf82674

--
Philip Daniels