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This message was discovered on ASPFriends.com 'aspngxml' list.

SNegussie@aol.com

Hi,

I get the following XML exception:

[XmlException: There is invalid data at the root level. Line 1, position 1.]

Any ideas why?

Reply to this message...

TomMallard

Where's the code?

Bet you didn't define the root...

tom mallard
seattle
-----Original Message-----
From: Click here to reveal e-mail address [mailto:Click here to reveal e-mail address]
Sent: Saturday, June 29, 2002 3:49 PM
To: aspngxml
Subject: [aspngxml] XMLException

Hi,

I get the following XML exception:

[XmlException: There is invalid data at the root level. Line 1, position
1.]

Any ideas why? | [aspngxml] member Click here to reveal e-mail address = YOUR ID
| http://www.asplists.com/asplists/aspngxml.asp = JOIN/QUIT
| http://www.asplists.com/search = SEARCH Archives

Reply to this message...

SNegussie@aol.com

The root is defined. I'm using XMLTextWriter to build the XML file. Here's
the part of the code that I believe is relevant to this discussion:

HttpContext current;
current = HttpContext.Current;
current.Response.ContentType = "text/xml";
current.Response.ContentEncoding = new System.Text.UTF8Encoding();

TextWriter outputWriter = current.Response.Output;
XmlTextWriter writer = new XmlTextWriter(outputWriter);

int leftnode, rightnode;

writer.Formatting = Formatting.Indented;

//Use XMLTextWriter to build the tree
writer.WriteStartDocument();
writer.WriteStartElement("TREENODES");

writer.WriteStartElement("TreeNode");
writer.WriteAttributeString("id", "activity" +
rlevelone["activity_id"].ToString());
writer.WriteAttributeString("Text", "" +
rlevelone["Name"].ToString() + "");

writer.WriteAttributeString("NavigateUrl",destinationUrl.ToString()+rlevelone[

"activity_id"].ToString());
writer.WriteEndElement();

writer.WriteEndDocument();
writer.Close();

Reply to this message...

TomMallard

Why do you declare the start element twice?

writer.WriteStartElement("TREENODES");

writer.WriteStartElement("TreeNode");

tom
-----Original Message-----
From: Click here to reveal e-mail address [mailto:Click here to reveal e-mail address]
Sent: Sunday, June 30, 2002 12:48 PM
To: aspngxml
Subject: [aspngxml] RE: XMLException

The root is defined. I'm using XMLTextWriter to build the XML file.
Here's the part of the code that I believe is relevant to this discussion:

HttpContext current;
current = HttpContext.Current;
current.Response.ContentType = "text/xml";
current.Response.ContentEncoding = new System.Text.UTF8Encoding();

TextWriter outputWriter = current.Response.Output;
XmlTextWriter writer = new XmlTextWriter(outputWriter);

int leftnode, rightnode;

writer.Formatting = Formatting.Indented;

//Use XMLTextWriter to build the tree
writer.WriteStartDocument();
writer.WriteStartElement("TREENODES");

writer.WriteStartElement("TreeNode");
writer.WriteAttributeString("id", "activity" +
rlevelone["activity_id"].ToString());
writer.WriteAttributeString("Text", "" + rlevelone["Name"].ToString() +
"");

writer.WriteAttributeString("NavigateUrl",destinationUrl.ToString()+rlevelon
e["activity_id"].ToString());
writer.WriteEndElement();

writer.WriteEndDocument();
writer.Close(); | [aspngxml] member Click here to reveal e-mail address = YOUR ID
| http://www.asplists.com/asplists/aspngxml.asp = JOIN/QUIT
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Reply to this message...

Kirk Allen Evans

Is it possible that rlevelone["activityid"] is null?

Here is a watered-down version of the code that works. Does this sample
code run without error? If so, then start adding a little bit more of your
code in (like rlevelone and the NavigateURL) to see if any of those are
actually causing the error indirectly.

Your sample code does not have a matching number of WriteStartElement and
WriteEndElement calls, but the WriteEndDocument call should close any open
Element tags. The only other additions I made were directly using the
Reponse.Output property in the ctor to XmlTextWriter, and added a call to
the XmlTextWriter's Flush method to commit the changes to the underlying
stream prior to closing the writer. These changes should be mostly
cosmetic, though, and have no bearing on the XmlException that you are
receiving. This should at least help you pinpoint more closely what is
happening.

private void Page_Load(object sender, System.EventArgs e)
{
HttpContext current;
current = HttpContext.Current;
current.Response.ContentType = "text/xml";
current.Response.ContentEncoding = new System.Text.UTF8Encoding();

XmlTextWriter writer = new XmlTextWriter(current.Response.Output);

writer.Formatting = Formatting.Indented;

//Use XMLTextWriter to build the tree
writer.WriteStartDocument();
writer.WriteStartElement("TREENODES");

writer.WriteStartElement("TreeNode");
writer.WriteAttributeString("id", "activity1");
writer.WriteAttributeString("Text", "test");

writer.WriteAttributeString("NavigateUrl","http://www.test.com";);
writer.WriteEndElement();

writer.WriteEndDocument();
writer.Flush();
writer.Close();
}

Kirk Allen Evans
http://www.xmlandasp.net
"XML and ASP.NET", New Riders Publishing
http://www.amazon.com/exec/obidos/ASIN/073571200X

Reply to this message...

SNegussie@aol.com

I found out what the problem was. It had to do with the data that was
returned. One of the filters I was using was not correct.

Thanks
S

Reply to this message...

	System.EventArgs
	System.IO.TextWriter
	System.Text.UTF8Encoding
	System.Web.HttpContext
	System.Windows.Forms.TreeNode
	System.Xml.Formatting
	System.Xml.XmlException
	System.Xml.XmlTextWriter

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