Question

I had a Dataset with some data in it. When I tried to write this DataSet into a file, everything was OK. But When I tried to write it into a MemoryStream, the XML file declaration was lost. The code looks like:

DataSet dSet = new DataSet(); //load schema, fill data in dSet.WriteXML('testFile.xml'); MemoryStream stream = new MemoryStream(); dSet.WriteXML(stream); stream.Seek(0,SeekOrigin.Begin); 

When I opened file testFile.xml, I got:

<?xml version='1.0' standalone='yes'?> //balabala 

But When I open the stream with StreamReader, I only got:

//balabala 

Somebody said I can insert XML file declaration in my stream manually. It works but seems so ugly. Do you know why it dropped the first line and any more simple solution?

Answer 1

It wasn’t dropped. Simply not included. Though it is highly recommend the xml declaration is not a required element of the xml specification.

http://msdn.microsoft.com/en-us/library/ms256048(VS.85).aspx

You can use XmlWriter.WriteStartDocument to include the xml declaration in the stream like so:

MemoryStream stream = new MemoryStream(); var writer = XmlWriter.Create(stream); writer.WriteStartDocument(true); dSet.WriteXML(stream);