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.ArgumentException: Cannot convert Test to System.Int32.
Parameter name: type ---> System.FormatException: Input string was not in a
correct format.
at System.Number.ParseInt32(String s, NumberStyles style,
NumberFormatInfo info)
at System.String.System.IConvertible.ToInt32(IFormatP rovider provider)
at System.Convert.ChangeType(Object value, Type conversionType,
IFormatProvider provider)
at System.Web.Services.Protocols.ScalarFormatter.From String(String value,
Type type)
--- End of inner exception stack trace ---
at System.Web.Services.Protocols.ScalarFormatter.From String(String value,
Type type)
at
System.Web.Services.Protocols.ValueCollectionParam eterReader.Read(NameValueC
ollection collection)
at System.Web.Services.Protocols.UrlParameterReader.R ead(HttpRequest
request)
at System.Web.Services.Protocols.HttpServerProtocol.R eadParameters()
at System.Web.Services.Protocols.WebServiceHandler.In voke()
at System.Web.Services.Protocols.WebServiceHandler.Co reProcessRequest()
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*********@pursca.com> дÈëÏûÏ¢
news:#Y*************@tk2msftngp13.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.ArgumentException: Cannot convert Test to System.Int32.
Parameter name: type ---> System.FormatException: Input string was not in a correct format.
at System.Number.ParseInt32(String s, NumberStyles style,
NumberFormatInfo info)
at System.String.System.IConvertible.ToInt32(IFormatP rovider provider)
at System.Convert.ChangeType(Object value, Type conversionType,
IFormatProvider provider)
at System.Web.Services.Protocols.ScalarFormatter.From String(String value, Type type)
--- End of inner exception stack trace ---
at System.Web.Services.Protocols.ScalarFormatter.From String(String value, Type type)
at
System.Web.Services.Protocols.ValueCollectionParam eterReader.Read(NameValueC ollection collection)
at System.Web.Services.Protocols.UrlParameterReader.R ead(HttpRequest
request)
at System.Web.Services.Protocols.HttpServerProtocol.R eadParameters()
at System.Web.Services.Protocols.WebServiceHandler.In voke()
at System.Web.Services.Protocols.WebServiceHandler.Co reProcessRequest()
Is there a way to override the behavior? I tried the SoapExtension and try
to change the empty string