[RESOLVED] Issue Web Service and ASP.Net

[hensa22]

hi everyone

I am facing an issue

An unhandled exception of type 'System.InvalidOperationException' occurred in System.Xml.dll Additional information: Error en el documento XML (1, 1634).

When I invoke a web service it trigers error message, I figure out it is when data retrieved from web service has character especials.

any setting to fix it??


thanks in advance

[Cimperiali]

it might be mainly a matter of permissions?
ie:
http://stackoverflow.com/questions/6...class-result-1

but if you think it is only when special chars are involved, you should ask to those who developed the web service (or look better at the service exposed methods )

[hensa22]

thanks for reply

I already solve it

web service method returns a datatable when I changed method so it returns a dataset. the error message is not showed and everything work fine.



But I think , why????

[Cimperiali]

something remind me that you could not send datatables through ws, only dataset (that is: you have to warp datatables inside a dataset). Something related on how serialization is done:
thus I searched and found it here:
http://support.microsoft.com/kb/306134

The DataTable, DataRow, DataView, and DataViewManager objects cannot be serialized and cannot be returned from an XML Web service. To return less than a complete DataSet, you must copy the data that you want to return to a new DataSet.

mistake come from long past when we read :
http://msdn.microsoft.com/en-us/libr...v=vs.100).aspx
the version 1.1 of framework spoke about datatable being serializable pe se, but code uses dataset (you can see the difference with 4.0, where datatables are less enphatized)
version 1.1

the DataSet and DataTable are "serializable" in that they can be specified as an input to or output from XML Web services without any additional coding required to stream the contents of the DataSet from an XML Web service to a client and back. The DataSet is implicitly converted to an XML stream using the DiffGram format, is sent over the network, and is then reconstructed from the XML stream as a DataSet on the receiving end. This gives you a very simple and flexible method for transmitting and returning relational data using XML Web services.

version 4.0

The DataSet was architected with a disconnected design, in part to facilitate the convenient transport of data over the Internet. The DataSet is "serializable" in that it can be specified as an input to or output from XML Web services without any additional coding required to stream the contents of the DataSet from an XML Web service to a client and back. The DataSet is implicitly converted to an XML stream using the DiffGram format, sent over the network, and then reconstructed from the XML stream as a DataSet on the receiving end. This gives you a very simple and flexible method for transmitting and returning relational data using XML Web services