InvalidCastExce ption when casting object returned from web service

[Jim S]

I have a .net framework 2.0 client (Pocket PC) and a .net 2.0 webservice that
communicate on the same LAN. The Pocket PC has no problem consuming strings
returned from the web service methoeds but I’m unable to receive and a custom
object. The error occurs when the PocketPC app casts a returned object
(WebServiceServ er.objectA) from the webservice to pocketPC.Object A (results
in InvalidCastExep tion). ObjectA is a simple class and is identical on the
PocketPC and Webservice. I’ve verified the object is being returned to the
PocketPC intact (debugging indicates all correct types exist and values
populated) but when I try to cast it from type Object to pocketPC.Object A in
the PocketPC code I get the exception. I’ve also replaced the representation
of pocketPC.Object A in Reference.cs with a copy of the actual
pocketPC.Object A. What am I doing wrong? Is this not supported by compact
framework?
Thanks,
Jim

public class ObjectA //same on client and web service
{
private string sStringA = string.Empty;
private string sStringB = string.Empty;
private string sStringC = string.Empty;

public ObjectA() { }

public ObjectA() string sParamA, DateTime dtParamB,string sParamC)
{
this.sStringA = sSomeStringDete rminedByWebServ iceBizLogic;
this.sStringB = sSomeStringDete rminedByWebServ iceBizLogic;;
this.sStringC = sSomeStringDete rminedByWebServ iceBizLogic;;
}
public string StringA
{
get { return this.sStringA;}
set { this.sStringA = value; }
}

public string StringB
{
get { return this.sStringB; }
}
public string SringC
{
get { return this.sStringC; }
set { this.sStringC = value; }
}
}

Client code (Pocket PC)

public static ObjectA GetObjectAFromW ebService()
{
WebServiceServe r.Service ws = new WebServiceServe r.Service();
object tmpObject = (object)ws.GetO bjectAForPocket PC(someParamA,
someParamB);
ObjectA objectA = (ObjectA)tmpObj ect;
//The above cast results in the InvalidCastExce ption

//I’ve also tried to assign directly to the PocketPC ObjectA but receive a
compile time error. The below statement does not work.
// ObjectA objectA = ws.GetObjectAFo rPocketPC (someParamA, someParamB)
return objectA;
}

[Kevin Spencer]

The returned object is of the type that it was when the Web Service
generated it, not an identical but different class which you copied.

--
HTH,

Kevin Spencer
Microsoft MVP
Chicken Salad Surgery

It takes a tough man to make a tender chicken salad.
"Jim S" <Ji**@discussio ns.microsoft.co mwrote in message
news:70******** *************** ***********@mic rosoft.com...

>I have a .net framework 2.0 client (Pocket PC) and a .net 2.0 webservice
that
communicate on the same LAN. The Pocket PC has no problem consuming
strings
returned from the web service methoeds but I'm unable to receive and a
custom
object. The error occurs when the PocketPC app casts a returned object
(WebServiceServ er.objectA) from the webservice to pocketPC.Object A
(results
in InvalidCastExep tion). ObjectA is a simple class and is identical on
the
PocketPC and Webservice. I've verified the object is being returned to
the
PocketPC intact (debugging indicates all correct types exist and values
populated) but when I try to cast it from type Object to pocketPC.Object A
in
the PocketPC code I get the exception. I've also replaced the
representation
of pocketPC.Object A in Reference.cs with a copy of the actual
pocketPC.Object A. What am I doing wrong? Is this not supported by
compact
framework?
Thanks,
Jim

public class ObjectA //same on client and web service
{
private string sStringA = string.Empty;
private string sStringB = string.Empty;
private string sStringC = string.Empty;

public ObjectA() { }

public ObjectA() string sParamA, DateTime dtParamB,string sParamC)
{
this.sStringA = sSomeStringDete rminedByWebServ iceBizLogic;
this.sStringB = sSomeStringDete rminedByWebServ iceBizLogic;;
this.sStringC = sSomeStringDete rminedByWebServ iceBizLogic;;
}
public string StringA
{
get { return this.sStringA;}
set { this.sStringA = value; }
}

public string StringB
{
get { return this.sStringB; }
}
public string SringC
{
get { return this.sStringC; }
set { this.sStringC = value; }
}
}

Client code (Pocket PC)

public static ObjectA GetObjectAFromW ebService()
{
WebServiceServe r.Service ws = new WebServiceServe r.Service();
object tmpObject = (object)ws.GetO bjectAForPocket PC(someParamA,
someParamB);
ObjectA objectA = (ObjectA)tmpObj ect;
//The above cast results in the InvalidCastExce ption

//I've also tried to assign directly to the PocketPC ObjectA but receive a
compile time error. The below statement does not work.
// ObjectA objectA = ws.GetObjectAFo rPocketPC (someParamA, someParamB)
return objectA;
}

[Jim S]

ok, how should I cast it to the client.ObjectA? Do I need to enumerate
through webservice.Obje ctA's types and copy them each to client.ObjectA? I
hope not.
Thanks,
Jim

"Kevin Spencer" wrote:

The returned object is of the type that it was when the Web Service
generated it, not an identical but different class which you copied.

--
HTH,

Kevin Spencer
Microsoft MVP
Chicken Salad Surgery

It takes a tough man to make a tender chicken salad.
"Jim S" <Ji**@discussio ns.microsoft.co mwrote in message
news:70******** *************** ***********@mic rosoft.com...

I have a .net framework 2.0 client (Pocket PC) and a .net 2.0 webservice
that
communicate on the same LAN. The Pocket PC has no problem consuming
strings
returned from the web service methoeds but I'm unable to receive and a
custom
object. The error occurs when the PocketPC app casts a returned object
(WebServiceServ er.objectA) from the webservice to pocketPC.Object A
(results
in InvalidCastExep tion). ObjectA is a simple class and is identical on
the
PocketPC and Webservice. I've verified the object is being returned to
the
PocketPC intact (debugging indicates all correct types exist and values
populated) but when I try to cast it from type Object to pocketPC.Object A
in
the PocketPC code I get the exception. I've also replaced the
representation
of pocketPC.Object A in Reference.cs with a copy of the actual
pocketPC.Object A. What am I doing wrong? Is this not supported by
compact
framework?
Thanks,
Jim

public class ObjectA //same on client and web service
{
private string sStringA = string.Empty;
private string sStringB = string.Empty;
private string sStringC = string.Empty;

public ObjectA() { }

public ObjectA() string sParamA, DateTime dtParamB,string sParamC)
{
this.sStringA = sSomeStringDete rminedByWebServ iceBizLogic;
this.sStringB = sSomeStringDete rminedByWebServ iceBizLogic;;
this.sStringC = sSomeStringDete rminedByWebServ iceBizLogic;;
}
public string StringA
{
get { return this.sStringA;}
set { this.sStringA = value; }
}

public string StringB
{
get { return this.sStringB; }
}
public string SringC
{
get { return this.sStringC; }
set { this.sStringC = value; }
}
}

Client code (Pocket PC)

public static ObjectA GetObjectAFromW ebService()
{
WebServiceServe r.Service ws = new WebServiceServe r.Service();
object tmpObject = (object)ws.GetO bjectAForPocket PC(someParamA,
someParamB);
ObjectA objectA = (ObjectA)tmpObj ect;
//The above cast results in the InvalidCastExce ption

//I've also tried to assign directly to the PocketPC ObjectA but receive a
compile time error. The below statement does not work.
// ObjectA objectA = ws.GetObjectAFo rPocketPC (someParamA, someParamB)
return objectA;
}