DataSet.ReadXmlSchema Method (String)


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

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

Public Sub ReadXmlSchema (
	fileName As String


Type: System.String

The file name (including the path) from which to read.

Exception Condition

FileIOPermission is not set 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.


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.


If the schema for your DataSet contains elements of the same name, but different type, in the same namespace, an exception is 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.

Private Sub ReadSchemaFromFile()
    ' 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"

    ' Invoke the ReadXmlSchema method with the file name.
End Sub


for reading and writing files. Associated enumeration: FileIOPermissionAccess

.NET Framework
Available since 1.1
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