How to validate an XML file with a schema in memory with .NET?

Question

Is it possible to validate an XML file using an XSD loaded at runtime from embedded application resources instead of using a physical file, with .NET (Framework 3.5)?

Thanks in advance

Answer 1

You can use XmlSchemaCollection.Add(string, XmlReader):

string file = "Assembly.Namespace.FileName.ext";
XmlSchemaCollection xsc = new XmlSchemaCollection();
xsc.Add(null, new XmlTextReader(
    this.GetType().Assembly.GetManifestResourceStream(file)));

Answer 2

Here's mine:

public static bool IsValid(XElement element, params string[] schemas)
{
    XmlSchemaSet xsd = new XmlSchemaSet();
    XmlReader xr = null;
    foreach (string s in schemas)
    { 
        xr = XmlReader.Create(new MemoryStream(Encoding.Default.GetBytes(s)));
        xsd.Add(null, xr);
    }
    XDocument doc = new XDocument(element);
    var errored = false;
    doc.Validate(xsd, (o, e) => errored = true);
    return !errored;
}

And you can use it by:

var xe = XElement.Parse(myXmlString); //by memory; may be wrong
var result = IsValid(xe, MyApp.Properties.Resources.MyEmbeddedXSD);

This isn't a guarantee that this is 100%; its just a good starting point for you. XSD validation isn't something I'm completely up on...

Answer 3

Check out how it is done in Winter4NET. The full source code is here. The essential code excerpt:

Stream GetXsdStream() {
    string name = this.GetType().Namespace + ".ComponentsConfigSchema.xsd";
    return Assembly.GetExecutingAssembly().GetManifestResourceStream( name ); 
}

...

XmlSchema schema = XmlSchema.Read( GetXsdStream(), null);
xmlDoc.Schemas.Add( schema );
xmlDoc.Validate(new ValidationEventHandler(ValidationCallBack));