How to change SOAP message before it's validation

[John]

Hi, All,

I have a very simple webmethod:

[WebMethod]
public string HelloWorld(int i)
{
return i.ToString();
}

when someone call this service to pass a empty string and I got the nasty
error like:
System.Argument Exception: Cannot convert Test to System.Int32.
Parameter name: type ---> System.FormatEx ception: Input string was not in a
correct format.
at System.Number.P arseInt32(Strin g s, NumberStyles style,
NumberFormatInf o info)
at System.String.S ystem.IConverti ble.ToInt32(IFo rmatProvider provider)
at System.Convert. ChangeType(Obje ct value, Type conversionType,
IFormatProvider provider)
at System.Web.Serv ices.Protocols. ScalarFormatter .FromString(Str ing value,
Type type)
--- End of inner exception stack trace ---
at System.Web.Serv ices.Protocols. ScalarFormatter .FromString(Str ing value,
Type type)
at
System.Web.Serv ices.Protocols. ValueCollection ParameterReader .Read(NameValue C
ollection collection)
at System.Web.Serv ices.Protocols. UrlParameterRea der.Read(HttpRe quest
request)
at System.Web.Serv ices.Protocols. HttpServerProto col.ReadParamet ers()
at System.Web.Serv ices.Protocols. WebServiceHandl er.Invoke()
at System.Web.Serv ices.Protocols. WebServiceHandl er.CoreProcessR equest()
Is there a way to override the behavior? I tried the SoapExtension and try
to change the empty string

[Wonlay]

You cannot assign a null value to an int

"John" <jo*********@pu rsca.com> дÈëÏûÏ¢
news:#Y******** *****@tk2msftng p13.phx.gbl...

Hi, All,

I have a very simple webmethod:

[WebMethod]
public string HelloWorld(int i)
{
return i.ToString();
}

when someone call this service to pass a empty string and I got the nasty
error like:
System.Argument Exception: Cannot convert Test to System.Int32.
Parameter name: type ---> System.FormatEx ception: Input string was not in a correct format.
at System.Number.P arseInt32(Strin g s, NumberStyles style,
NumberFormatInf o info)
at System.String.S ystem.IConverti ble.ToInt32(IFo rmatProvider provider)
at System.Convert. ChangeType(Obje ct value, Type conversionType,
IFormatProvider provider)
at System.Web.Serv ices.Protocols. ScalarFormatter .FromString(Str ing value, Type type)
--- End of inner exception stack trace ---
at System.Web.Serv ices.Protocols. ScalarFormatter .FromString(Str ing value, Type type)
at
System.Web.Serv ices.Protocols. ValueCollection ParameterReader .Read(NameValue C ollection collection)
at System.Web.Serv ices.Protocols. UrlParameterRea der.Read(HttpRe quest
request)
at System.Web.Serv ices.Protocols. HttpServerProto col.ReadParamet ers()
at System.Web.Serv ices.Protocols. WebServiceHandl er.Invoke()
at System.Web.Serv ices.Protocols. WebServiceHandl er.CoreProcessR equest()
Is there a way to override the behavior? I tried the SoapExtension and try
to change the empty string