DataSet.ReadXmlSchema Method (XmlReader)
Assembly: System.Data (in system.data.dll)
'Declaration Public Sub ReadXmlSchema ( _ reader As XmlReader _ ) 'Usage Dim instance As DataSet Dim reader As XmlReader instance.ReadXmlSchema(reader)
The XmlReader from which to read.
Use the ReadXmlSchema method to create the schema for a DataSet. The schema includes table, relation, and constraint definitions.
The XML schema is written using the XSD standard.
The ReadXmlSchema method is generally invoked before invoking the ReadXml method which is used to fill the DataSet.
The System.Xml.XmlReader class is abstract. A class that inherits from the XmlReader is the System.Xml.XmlTextReader class.
If the schema for your DataSet contains elements of the same name, but different type, in the same namespace, an exception is be thrown when you attempt to read the schema into the DataSet with ReadXmlSchema. This exception does not occur if you are using .NET Framework version 1.0.
The following example creates a new DataSet and System.IO.FileStream object. The FileStream object, created with a file path and file name, is used to create an System.Xml.XmlTextReader that is passed as an argument to the ReadXmlSchema method.
Private Sub ReadSchemaFromXmlTextReader() ' Create the DataSet to read the schema into. Dim thisDataSet As New DataSet() ' Set the file path and name. Modify this for your purposes. Dim filename As String = "Schema.xml" ' Create a FileStream object with the file path and name. Dim stream As New System.IO.FileStream _ (filename, System.IO.FileMode.Open) ' Create a new XmlTextReader object with the FileStream. Dim xmlReader As New System.Xml.XmlTextReader(stream) ' Read the schema into the DataSet and close the reader. thisDataSet.ReadXmlSchema(xmlReader) xmlReader.Close() End Sub
Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter EditionThe Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.