Web service to Upload XML string to DB :  gets error

Posted on 2010-09-07
Last Modified: 2012-06-21
I have a web service that accepts the xml string and uploads to the database..

        public void Service(string XML)
                using (DBDataContext db = new DBDataContext())

            catch (Exception err)
                throw err;

iam getting the below error
HTTP Transport error javax.xml.soap.SOAPException Error parsing envelope: (77,40) Invalid char in Text.

i know it is occurning beceause of some invalid characters in the xml string..
is there any other way to do it.. can anyone help.

also what do i need to do if i need to upload 100mb data..
Question by:gautam_reddyc
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LVL 24

Expert Comment

ID: 33624859
first of all, you should detect what character is invalid.

in general, you might want to encode your xml string before sending it to ws
LVL 40

Expert Comment

by:Richard Quadling
ID: 33625787
Line 77, character 40 would be were I would start.

At a guess, you have a < or a >.

Author Comment

ID: 33627821
the special characters are # and &..
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Author Comment

ID: 33627870
we are on the web service side.. we have no control of what is being sent as input.. how do we parse it
LVL 24

Expert Comment

ID: 33627938
replace xml special chars (like < by &amp;gt;)
LVL 40

Expert Comment

by:Richard Quadling
ID: 33628115
If it is a real soap service, then you reject it. It isn't valid XML and that's a requirement.

Can you show the node with the bad chars?

# doesn't ring any bells as far as I know.

& => &amp;

Unless you have something like ...

&#123; and you want that as the 6 characters, rather than { it represents.

In that case ...

&amp;#123; should be used.

Again, it isn't your concern normally as this is bad data.


Author Comment

ID: 33628168
it is in the comments tag
 <COMMENT>Item #1089 building </COMMENT>.. there are bunch of comments tag..
how to replace all.. any idea?

Author Comment

ID: 33628186
i know this is a bad data.. but we need to parse the entire xml string. identify all the special characters and replace them with good data..
LVL 40

Accepted Solution

Richard Quadling earned 500 total points
ID: 33628655
Not being rude, but good luck.

What criteria makes "bad data"?

That's why we have a parser to do this for us. It is inordinately complicated.

In essence you need to parse every character to determine if it < is for / or just some orphaned < in the middle of nowhere.

#1089 really shouldn't be an issue.

<?xml version="1.0"?>

is perfectly valid.

But ...

Assuming you CAN get hold of the XML before it gets to the parser ...

Using the regex ...


could work.

Dim ResultString As String
	ResultString = Regex.Replace(XMLString, ">(?![\r\n]+)([^<]*?)(?![\r\n]+)<(?![\r\n]+)([^<]*?)(?![\r\n]+)<", ">$1&lt;$2<", RegexOptions.IgnoreCase Or RegexOptions.Multiline)
Catch ex As ArgumentException
	'Syntax error in the regular expression
End Try

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Author Closing Comment

ID: 33649928
Works like a charm.. thanks..buddy
LVL 40

Expert Comment

by:Richard Quadling
ID: 33649998
Woo Hoo!

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