Xmlvalidatingreader class


04-Jan-2018 11:27

As far as using the XSLT code to insert the DOCTYPE, I couldn't use it because the XML files that I receive could be very large and I do not want to regenerate the whole file just to check for its validity.

As for creating a custom Xml Reader, I initially tried it but it is not that simple since in order to fake the DOCTYPE attribute one has to first determine that it is missing or invalid and then simulate it only in that case. Here is what I ended up doing: Because the Validating Reader does not throw any exceptions if DOCTYPE is missing I just check Xml Document.

Something like this: Xml Reader r = new Xml Text Reader("foo.xml"); Xml Writer w = new Xml Text Writer("foo2.xml", Encoding. Close(); Xml Validating Reader vr = new Xml Validating Reader(new Xml Text Reader("foo2.xml")); while (vr.

UTF8); bool has Doctype = false, in Prolog = true; while (r. Read()); -- Oleg Tkachenko [XML MVP] it's an interesting idea to check the file twice in case the Document Type is null I would rather see if there is any other way to do it.

Do you have any sample custom reader code that might create a DOCTYPE if one is not present? However MS documentation does not specify that the XML documents MUST have DOCTYPE or Validating Reader won't validate. Please remove "REMOVETHIS" from my email address to reply...

Because of that I would like to see MS actually provide some workaround for this issue. "Kevin Yu [MSFT]" node into the document using XSLT and validate the Xml Document.

It is unfortunate, since the file might actually be fully compatible with the DTD except for the missing DOCTYPE attribute.

If you have a sample code for the custom Xml Reader or any other workaround that would ensure that the missing DOCTYPE does not effect the Validating Reader functionality I would really appreciate it. "Oleg Tkachenko [MVP]" The problem occurs when the incoming XML contains no DOCTYPE attribute.

xmlvalidatingreader class-11

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If it is null-I reject the file as if it has failed the validation.

The problem is that Xml Validating Reader asks Xml Text Reader for Doctype via *internal* property of Xml Text Reader. Another alternative would be adding Doctype while passing XML through Xml Reader-Xml Writer pipe.

This whay you can modify document in a streaming way - without loading it into memory as a whole (Xml Document or XSLT approach).

UTF8); bool has Doctype = false, in Prolog = true; while (r. Read()); -- Oleg Tkachenko [XML MVP] Oleg for your suggestion. "Oleg Tkachenko [MVP]" While it's an interesting idea to check the file twice in case the Document Type is null I would rather see if there is any other way to do it.

There is still a permance hit though because I still have read the whole source file into a new file before reading the new file again using the validating reader. As was seen in Oleg's reply the custom validator could be one of the solutions since the XSLT would give me a substantial performance hit for large files (which I get a lot of). The problem is in tight coupling between Xml Validating Reader and Xml Text Reader - Xml Validating Reader requires Xml Text Reader as input reader (which is a well known bug).As was seen in Oleg's reply the custom validator could be one of the solutions since the XSLT would give me a substantial performance hit for large files (which I get a lot of). The problem is in tight coupling between Xml Validating Reader and Xml Text Reader - Xml Validating Reader requires Xml Text Reader as input reader (which is a well known bug).



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