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Passing XMLdocument to webservice method

Posted on 2009-07-01
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Last Modified: 2012-06-27
Hello expert,

I have a webservice created using asp.net/C#. The method in the webservice takes one input parameter as type object.

From my asp.net web application , i am calling the web service and passing a XML document to the webmethod.

It is throwing a error.

Here is my web service code:
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Xml;

namespace PCWebApplication
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            PCWebService.Service1 PCWS = new PCWebService.Service1();

            XmlDocument doc = new XmlDocument();
            doc.Load("C:\\Temp\\Test.xml");

            /// Call to web service:
            object result;
           
            result= (object) PCWS.ProcessXMLFile(doc);

            Response.Write((string) result);

        }
    }
}

---------------------------------------------------

Here is my calling code from asp.net web application:

 protected void Page_Load(object sender, EventArgs e)
        {
            PCWebService.Service1 PCWS = new PCWebService.Service1();

            XmlDocument doc = new XmlDocument();
            doc.Load("C:\\Temp\\Test.xml");

            /// Call to web service:
            object result;
           
            result= (object) PCWS.ProcessXMLFile(doc);

            Response.Write((string) result);

        }

------------------------------------------------------------
Error Message: The type System.Xml.XmlDocument may not be used in this context.

any help?

0
Comment
Question by:mani_sai
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5 Comments
 
LVL 8

Author Comment

by:mani_sai
ID: 24757040
Sorry here is my web service code:

using System;
using System.Data;
using System.Web;
using System.Collections;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.ComponentModel;
using System.Xml;
using System.Text;
namespace PCWebService
{
/// <summary>
/// Summary description for Service1
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[ToolboxItem(false)]
public class Service1 : System.Web.Services.WebService
{
[WebMethod]
public string HelloWorld()
{
return "Hello World";
}
[WebMethod]
public string ProcessXMLFile(object doc)
{
/// process doc as a local variable
///
// Get the root node so we can explore its children
XmlDocument newxml = new XmlDocument();
newxml = (XmlDocument) doc;
string stroutput = newxml.DocumentElement.FirstChild.InnerText;
// Store all the values of the elements in a string
//string allMyChildren = nodRoot.InnerText;
return stroutput;

}
 
}
}
0
 
LVL 21

Accepted Solution

by:
MogalManic earned 2000 total points
ID: 24761894
This will NEVER work.  Only classes that are marked [Serializable] can be passed as parameters in a web service.  The XmlDocument class is NOT serializable.

Here is an article on how serialization works:
  http://www.15seconds.com/issue/020903.htm

Web services usually use SoapSerialization which is XML.  Your best bet is to pass the XML as a string and reload the XML on the server.  So your code would be something like this:
client:
            PCWebService.Service1 PCWS = new PCWebService.Service1();

            XmlDocument doc = new XmlDocument();
            doc.Load("C:\\Temp\\Test.xml");

            /// Call to web service:
            object result;
           
            result= (object) PCWS.ProcessXMLFile(doc.DocElement.OuterText);
server:


[WebMethod]
public string ProcessXMLFile(String doc)
{
/// process doc as a local variable
///
// Get the root node so we can explore its children
XmlDocument newxml = new XmlDocument();
newxml.LoadXml(doc);
string stroutput = newxml.DocumentElement.FirstChild.InnerText;
// Store all the values of the elements in a string
//string allMyChildren = nodRoot.InnerText;
return stroutput;
 
} 

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0
 
LVL 8

Author Closing Comment

by:mani_sai
ID: 31598897
Thanks
0
 
LVL 8

Author Comment

by:mani_sai
ID: 24790755
When you pass XML as string, is there a size limitation, if yes how much is the limit?
0
 
LVL 21

Expert Comment

by:MogalManic
ID: 24793013
I don't think so.  The only limitation would be the total max length.  Currently the default max length is 4K.  If you want to increase that amount you need to include a HTTPRuntime element in your web config:
http://msdn.microsoft.com/en-us/library/e1f13641%28VS.71%29.aspx
0

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