Question

StringWriter encoding for XML

Asked by: RTSol

Hi,

I am trying to PUT an XML file to a server using http and I get some problems with the encoding. I work in Sweden and need to make sure that the swedish characters are passed ok. I have attached the code I am using. This code works fine except that the swedish characters is not passed ok - they are replaced by ? in the server response. If I change the encoding in the stringwriter to Encoding.UTF8 (which to me would be logical) the server returns an error: "The request was aborted: The request was canceled.". Any ideas?

Best regards
RTSol

public string updateCustomer(string URI, XDocument xdata, string User, string Password)
    {
        //response string
        string response = String.Empty;
 
        //Convert XDocument to string
        string sdata = xdata.ToString();
 
        try
        {
            // Set up the HttpWebRequest
            HttpWebRequest pRequest = (HttpWebRequest)WebRequest.Create(URI);
            pRequest.Method = "PUT";
            pRequest.Credentials = new NetworkCredential(User, Password);
            pRequest.ContentType = "application/xml";
            pRequest.ContentLength = sdata.Length;
 
            // Send the data.
            using (StreamWriter writer = new StreamWriter(pRequest.GetRequestStream(), Encoding.ASCII))
            {
                writer.Write(sdata);
            }
            // Get the response.
            using (StreamReader reader = new StreamReader(pRequest.GetResponse().GetResponseStream()))
            {
                response = reader.ReadToEnd();
            }
        }
        catch (WebException ex)
        {
            throw ex;
        }
        return response;
    }

                                  
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Asked On
2009-10-01 at 02:49:21ID24776351
Tags

Visual Studio

,

C#

,

XML

Topics

Visual Studio

,

Extensible Markup Language (XML)

,

C# Programming Language

Participating Experts
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Answers

 

by: kaylanreilorPosted on 2009-10-01 at 04:24:46ID: 25467519

In System.Xml namespace,  you CANNOT change the encoding when you deal with strings. You should have a look to what the guy says here : http://weblogs.asp.net/rmclaws/archive/2003/10/19/32534.aspx.

BTW why not trying the GetEncoding("ISO-8859-1") method of the Encoding class when building your StreamWriter object ?

 

by: RTSolPosted on 2009-10-01 at 07:40:54ID: 25469165

Hi,

GetEncoding("ISO-8859-1") worked slightly better - the request went through and response from the server was ok - se the first XML supplied. However, when I do a GET on the same data the server returns a corrupt XML file - se the second XML supplied. It seems that the encoding is not correct. Any ideas?

Best regards
RTSol

XML 1
 
<?xml version="1.0" encoding="UTF-8"?>
<customer>
<id>102269</id>
<name>RT solutions</name>
<email>robert@rtsolutions.se</email>
<phone>0707-584114</phone>
<fax></fax>
<address>V&#228;dursgatan 4C</address>
<city>G&#246;teborg</city>
<zipcode>41250</zipcode>
<country_id>196</country_id>
<country_name>Sweden</country_name>
<contact_firstname>Robert</contact_firstname>
<contact_surname>Tell</contact_surname>
<created_at>Wed Sep 30 09:03:51 +0200 2009</created_at>
<updated_at>Thu Oct 01 14:06:16 +0200 2009</updated_at>
</customer>
 
XML 2
 
<?xml version="1.0" encoding="UTF-8"?>
<customer>
<id>102269</id>
<name>RT solutions</name>
<email>robert@rtsolutions.se</email>
<phone>0707-584114</phone>
<fax></fax>
<address>V</address>
<city>G</city>
<zipcode>41250</zipcode>
<country_id>196</country_id>
<country_name>Sweden</country_name>
<contact_firstname>Robert</contact_firstname>
<contact_surname>Tell</contact_surname>
<created_at>Wed Sep 30 09:03:51 +0200 2009</created_at>
<updated_at>Thu Oct 01 14:06:16 +0200 2009</updated_at>
</customer>

                                              
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by: kaylanreilorPosted on 2009-10-02 at 00:58:17ID: 25475872

Do you mean that your writting the same code as above with a "GET" for the HttpWebRequest.Method ?

 

by: RTSolPosted on 2009-10-02 at 02:56:48ID: 25476386

I use the method below. I have been reading about this and it seems to be a conflict between the internal encoding in .NET which seems to be UTF-16 and the required encoding for the XML in the http PUT procedure. I confess that I haven't worked much with these issues but is it so that the code

string sdata = xdata.ToString(); //xdata is the XDocument

will produce a string with UTF-16 encoding? If so how can I convert it to UTF-8 before I pass it on?

Best regards
RTSol

    public String getXMLData(string URI, string User, string Password)
    {
        String request = String.Empty;
        try
        {
            HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create(URI);
            myReq.Method = "GET";
            myReq.Credentials = new NetworkCredential(User, Password);
 
            // Get the response.
            using (StreamReader reader = new StreamReader(myReq.GetResponse().GetResponseStream()))
            {
                request = reader.ReadToEnd();
            }
 
        }
        catch (WebException ex)
        {
            throw ex;
        }
        return request;
    }
                                              
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by: RTSolPosted on 2009-10-02 at 05:52:31ID: 25477365

Hi,

I finally found a working solutions here:
http://p2p.wrox.com/asp-net-1-0-1-1-professional/57098-c-post-xml-using-httpwebrequest-response.html
Thanks for your effort

Best regards
RTSol

20120131-EE-VQP-002

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