serialization prob

[frazer]

using System;
using System.Runtime. Serialization;
using System.IO;
using System.Runtime. Serialization.F ormatters.Binar y;


namespace MySerialize
{
/// <summary>
/// Summary description for MySerialize.
/// </summary>
[Serializable]
public class MySerialize: ISerializable
{
string name = "Sheraze";
private MySerialize()
{
}
public MySerialize(str ing name )
{
this.name = name;
}
void ISerializable.G etObjectData(Se rializationInfo info,StreamingC ontext
context)
{
info.SetType(ty peof(MySerializ e));
}
}
public class MyTestApp
{
[STAThread]
public static void Main()
{
FileStream fs = new FileStream("mys erialize.txt", FileMode.Create );
BinaryFormatter formatter = new BinaryFormatter ();
MySerialize[] obj1 = {new MySerialize("Na me1") , new MySerialize("Na me2")};
formatter.Seria lize(fs, obj1);
fs.Position = 0;
MySerialize[] obj2 = (MySerialize[]) formatter.Deser ialize(fs);
fs.Close();
}
}
}



i get an error on this line saying
MySerialize[] obj2 = (MySerialize[]) formatter.Deser ialize(fs);

Additional information: The constructor to deserialize an object of type
MySerialize.MyS erialize was not found.
why is that and how do i resolve it?
thnx

[Stuart Gunter]

Re: serialization prob

As far as I know, serialization requires a public default constructor,
whereas yours is private.

Maybe give this a try and see what happens.

Can anyone confirm this?


"frazer" <ichor@hotmail. com> wrote in message
news:O$DxW0EREH A.2408@tk2msftn gp13.phx.gbl...[color=blue]
> using System;
> using System.Runtime. Serialization;
> using System.IO;
> using System.Runtime. Serialization.F ormatters.Binar y;
>
>
> namespace MySerialize
> {
> /// <summary>
> /// Summary description for MySerialize.
> /// </summary>
> [Serializable]
> public class MySerialize: ISerializable
> {
> string name = "Sheraze";
> private MySerialize()
> {
> }
> public MySerialize(str ing name )
> {
> this.name = name;
> }
> void ISerializable.G etObjectData(Se rializationInfo info,StreamingC ontext
> context)
> {
> info.SetType(ty peof(MySerializ e));
> }
> }
> public class MyTestApp
> {
> [STAThread]
> public static void Main()
> {
> FileStream fs = new FileStream("mys erialize.txt", FileMode.Create );
> BinaryFormatter formatter = new BinaryFormatter ();
> MySerialize[] obj1 = {new MySerialize("Na me1") , new[/color]
MySerialize("Na me2")};[color=blue]
> formatter.Seria lize(fs, obj1);
> fs.Position = 0;
> MySerialize[] obj2 = (MySerialize[]) formatter.Deser ialize(fs);
> fs.Close();
> }
> }
> }
>
>
>
> i get an error on this line saying
> MySerialize[] obj2 = (MySerialize[]) formatter.Deser ialize(fs);
>
> Additional information: The constructor to deserialize an object of type
> MySerialize.MyS erialize was not found.
> why is that and how do i resolve it?
> thnx
>
>[/color]

[frazer]

Re: serialization prob

yup u are right and it works fine now..when i try to Serialize and
deserialize strings.

but i now want to serialize and deserialize a dataset object.
(UserPreference DataSet) that i created myself.
how do i do that?

I am able to serialize using
void ISerializable.G etObjectData(Se rializationInfo info, StreamingContex t
context)
{
info.AddValue(" DataSet", this.userPrefer enceDataSet);
}

but when i deserialize , i get an error.
public UserPreference( SerializationIn fo info, StreamingContex t context)
{
this.userPrefer enceDataSet = (UserPreference DataSet)
info.GetValue(" DataSet", this.userPrefer enceDataSet.Get Type());
}

Exception has been thrown by the target of an invocation.

I think maybe the reason is that info.GetValue doesnt take a dataset type
as a parameter.
i looked into a dataset created internally by dotnet.


protected UserPreferenceD ataSet(Serializ ationInfo info, StreamingContex t
context) {
string strSchema = ((string)(info. GetValue("XmlSc hema", typeof(string)) ));
if ((strSchema != null)) {
DataSet ds = new DataSet();
ds.ReadXmlSchem a(new XmlTextReader(n ew System.IO.Strin gReader(strSche ma)));
if ((ds.Tables["UserPreference "] != null)) {
this.Tables.Add (new UserPreferenceD ataTable(ds.Tab les["UserPreference "]));
}
this.DataSetNam e = ds.DataSetName;
this.Prefix = ds.Prefix;
this.Namespace = ds.Namespace;
this.Locale = ds.Locale;
this.CaseSensit ive = ds.CaseSensitiv e;
this.EnforceCon straints = ds.EnforceConst raints;
this.Merge(ds, false, System.Data.Mis singSchemaActio n.Add);
this.InitVars() ;
}
else {
this.InitClass( );
}
this.GetSeriali zationData(info , context);
System.Componen tModel.Collecti onChangeEventHa ndler schemaChangedHa ndler =
new System.Componen tModel.Collecti onChangeEventHa ndler(this.Sche maChanged);
this.Tables.Col lectionChanged += schemaChangedHa ndler;
this.Relations. CollectionChang ed += schemaChangedHa ndler;
}

do i have to deserialize using this code as a guide?
or is there a simpler way to deserialze a dataset?
thanx

[frazer]

Re: serialization prob

whoops,,
it works fine.
i had a typo in my calling program
thanx for your time


"frazer" <ichor@hotmail. com> wrote in message
news:uQ49kYHREH A.1892@TK2MSFTN GP09.phx.gbl...[color=blue]
> yup u are right and it works fine now..when i try to Serialize and
> deserialize strings.
>
> but i now want to serialize and deserialize a dataset object.
> (UserPreference DataSet) that i created myself.
> how do i do that?
>
> I am able to serialize using
> void ISerializable.G etObjectData(Se rializationInfo info, StreamingContex t
> context)
> {
> info.AddValue(" DataSet", this.userPrefer enceDataSet);
> }
>
> but when i deserialize , i get an error.
> public UserPreference( SerializationIn fo info, StreamingContex t context)
> {
> this.userPrefer enceDataSet = (UserPreference DataSet)
> info.GetValue(" DataSet", this.userPrefer enceDataSet.Get Type());
> }
>
> Exception has been thrown by the target of an invocation.
>
> I think maybe the reason is that info.GetValue doesnt take a dataset type
> as a parameter.
> i looked into a dataset created internally by dotnet.
>
>
> protected UserPreferenceD ataSet(Serializ ationInfo info, StreamingContex t
> context) {
> string strSchema = ((string)(info. GetValue("XmlSc hema", typeof(string)) ));
> if ((strSchema != null)) {
> DataSet ds = new DataSet();
> ds.ReadXmlSchem a(new XmlTextReader(n ew[/color]
System.IO.Strin gReader(strSche ma)));[color=blue]
> if ((ds.Tables["UserPreference "] != null)) {
> this.Tables.Add (new UserPreferenceD ataTable(ds.Tab les["UserPreference "]));
> }
> this.DataSetNam e = ds.DataSetName;
> this.Prefix = ds.Prefix;
> this.Namespace = ds.Namespace;
> this.Locale = ds.Locale;
> this.CaseSensit ive = ds.CaseSensitiv e;
> this.EnforceCon straints = ds.EnforceConst raints;
> this.Merge(ds, false, System.Data.Mis singSchemaActio n.Add);
> this.InitVars() ;
> }
> else {
> this.InitClass( );
> }
> this.GetSeriali zationData(info , context);
> System.Componen tModel.Collecti onChangeEventHa ndler schemaChangedHa ndler =
> new[/color]
System.Componen tModel.Collecti onChangeEventHa ndler(this.Sche maChanged);[color=blue]
> this.Tables.Col lectionChanged += schemaChangedHa ndler;
> this.Relations. CollectionChang ed += schemaChangedHa ndler;
> }
>
> do i have to deserialize using this code as a guide?
> or is there a simpler way to deserialze a dataset?
> thanx
>
>
>
>[/color]