How can I get a simple c# web service to return <?xml version=“1.0” encoding=“utf-16” ?> header?

问题

I've written a very simple web service that returns an XML document.

The header for that document is currently <?xml version="1.0" encoding="utf-8" ?>

and I would like it to return <?xml version="1.0" encoding="utf-16" ?>

How can I change the default output encoding in the .asmx or .cs file?

smo.asmx
<%@ WebService Language="C#" Class="smo" %>


smo.asmx
using <blah>

[WebService(Namespace="http://www.bl.uk/webservices/")]
public class smo : WebService
{
    [XmlRoot(ElementName = "SQLServer")]
    public class CDatabaseBackup
{
    public string ServerName;
    public string DatabaseCount;
     }

//
// Generic SMO query processor
//
[WebMethod(Description = "WMIClassProperty: ", EnableSession = false, CacheDuration=60)]

public CDatabaseBackup smoDatabaseBackupStatus(string SQLServerName)
{
    CDatabaseBackup result = new CDatabaseBackup();
    Server svr;
              <blah>
              return result;
      }

Ultimately this web service will be used within a SQL Server function and converted into an xml data type. According to the documentation this needs to be UTF-16.

alter
procedure monitor_sqlbackupaudit 
as
begin

declare @l_xml_result   nvarchar(max)
set @l_xml_result   = ( select dbo.uspSMODatabaseBackup('sqlprod1vs') )
--set   @l_xml_result   = replace(@l_xml_result,'UTF-8','UTF-16');

declare @l_xml      xml
set @l_xml      = @l_xml_result

end
go

---

exec monitor_sqlbackupaudit

Msg 9402, Level 16, State 1, Procedure monitor_sqlbackupaudit, Line 15
XML parsing: line 1, character 38, unable to switch the encoding

回答1:

You can configure your web service to process UTF-16 instead of UTF-8 in the globalization section of Web.config. The requestEncoding and responseEncoding attributes of the globalization tag should be set to UTF-16.

<globalization requestEncoding="utf-8" responseEncoding="utf-8"/>

must be converted to

<globalization requestEncoding="utf-16" responseEncoding="utf-16"/>

This change will allow the web service to output UTF-16, but it will also require the client to make its request in UTF-16.

来源：https://stackoverflow.com/questions/4146762/how-can-i-get-a-simple-c-sharp-web-service-to-return-xml-version-1-0-encodin