Error Serializing a Wrapped SortedList

[Phil Galey]

I'm using VB.NET 2002 on Windows 2000 Pro and am having trouble serializing a SortedList.

This is my class:
<Serializable() Public Class clsGoodFiles
Inherits SortedList
Public Sub New()
MyBase.New()
End Sub
End Class

This is my calling code:

Dim xw As New Xml.XmlTextWrit er(Path.Combine (Application.St artupPath, "GoodFiles.xml" ), System.Text.Enc oding.UTF8)
Dim xs As New Xml.Serializati on.XmlSerialize r(GetType(clsGo odFiles)) <=== ERROR LINE
Dim obj As New clsGoodFiles()
obj.Add("ABC.TI F", "A")
xs.Serialize(xw , obj)
xw.Close()
xw = Nothing
xs = Nothing
GC.Collect()

When it gets to the line indicated as ERROR LINE, it generates the following error:

An unhandled exception of type 'System.Invalid OperationExcept ion' occurred in system.xml.dll
Additional information: There was an error reflecting 'WindowsApplica tion22.clsGoodF iles'.

This same technique works fine if I inherit an ArrayList. But ArrayList and SortedList both show Serializable in the documentation. Is there a way to get the serialization of the SortedList to work? Thanks.

Phil

[Martin Honnen]

Phil Galey wrote:

This same technique works fine if I inherit an ArrayList. But ArrayList
and SortedList both show Serializable in the documentation. Is there a
way to get the serialization of the SortedList to work?

I don't think so, when I try your code with VS 2003 then I get a more
specific error message:

Unhandled Exception: System.NotSuppo rtedException: The type
ConsoleApplicat ion35
..Module1+clsGo odFiles is not supported because it implements IDictionary.

So _XML serialization_ of that type is not supported. ArrayList does not
implement the interface IDictionary so it is different. And the
Serializable attribute refers to binary serialization, not XML
serialization.

--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

[Phil Galey]

Ok thanks, Martin.

Phil

"Martin Honnen" <ma*******@yaho o.dewrote in message
news:u9******** ******@TK2MSFTN GP02.phx.gbl...

Phil Galey wrote:

This same technique works fine if I inherit an ArrayList. But ArrayList
and SortedList both show Serializable in the documentation. Is there a
way to get the serialization of the SortedList to work?

I don't think so, when I try your code with VS 2003 then I get a more
specific error message:

Unhandled Exception: System.NotSuppo rtedException: The type
ConsoleApplicat ion35
.Module1+clsGoo dFiles is not supported because it implements IDictionary.

So _XML serialization_ of that type is not supported. ArrayList does not
implement the interface IDictionary so it is different. And the
Serializable attribute refers to binary serialization, not XML
serialization.

--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/