DataSet.ReadXmlSchema Method (TextReader)

Reads the XML schema from the specified TextReader into the DataSet.

Namespace:  System.Data
Assembly:  System.Data (in System.Data.dll)

'Declaration
Public Sub ReadXmlSchema ( _
	reader As TextReader _
)

Parameters

reader
Type: System.IO.TextReader

The TextReader from which to read.

Use the ReadXmlSchema method to create the schema for a DataSet. The schema includes table, relation, and constraint definitions. To write a schema to an XML document, use the WriteXmlSchema method.

The XML schema is written using the XSD standard.

NoteNote

Data corruption can occur if the msdata:DataType and the xs:type types do not match. No exception will be thrown.

The ReadXmlSchema method is generally invoked before invoking the ReadXml method which is used to fill the DataSet.

Classes that inherit from the TextReader class include the StreamReader and StringReader classes.

NoteNote

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 StreamReader object to read a schema with, and invokes the ReadXmlSchema method with the object.

Private Sub ReadSchemaFromStreamReader()
    ' 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 StreamReader object with the file path and name. 
    Dim readStream As New System.IO.StreamReader(filename)

    ' Invoke the ReadXmlSchema method with the StreamReader object.
    thisDataSet.ReadXmlSchema(readStream)

    ' Close the StreamReader
    readStream.Close()
End Sub

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Was this page helpful?
(1500 characters remaining)
Thank you for your feedback
Show:
© 2014 Microsoft