Validating XML file with XML schema

I want to be able to edit an XML file in browser. I open the XML file, read its contents and put it into a multi-line textbox for the user to edit it. Now, when the user wants to save the changes by pressing the save -button, I want to check if the XML data still is valid. For this I think the XML schema is perfect, right?

Now, how can I write an function that takes a string parameter (which contains the whole XML file data from the textbox) and validates it against a schema file? I created the schema by passing a 100% valid XML file to the Visual Studio´s "Create Schema" tool. The function would return another string containing the possible error message.

I googled around and found some example code, but i just dont seem to get it right. The code always seems to be so it would be super if someone would write a very simple (and commented) example code for me =)

9/10/2008 12:33:16 PM 7181 articles. 0 followers. Follow

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You can use XmlDocument.

  1. Load the Xml String using MyXmlDoc.LoadXml(...).
  2. Add Schemas using MyXmlDoc.Schemas.Add(...).
  3. Validate using MyXmlDoc.Validate(...)

Steve Wellens

My blog
9/10/2008 4:59:56 PM

I got it working, thanks Steve. The reason why i didnt get it working before was because I didnt know that you can set the default namespace and the validationevenhandler to null.

So now i have a function that returns true if validation agains specified schema passes, and if not, a error message about whats wrong in the XML is displayed and false is returned.

    private bool ValidateXML(string sXmlDataToValidate, string sSchemaFilePath)
            XmlDocument document = new XmlDocument();
            document.Schemas.Add(null, sSchemaFilePath);
            return true;
        catch (XmlException ex)
            lblError.Text = ex.Message;
            return false;

9/12/2008 8:28:22 AM

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