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How to user Dataset ReadXMLSchema from XML String without XSD File

Posted on 2010-09-04
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Last Modified: 2013-11-08
I have dataset which I used its GetXMLSchema and GetXML methods on. With those string values, how can I load a new dataset with the xml and its schema?

Here's my code so far:

        Dim sXMLSchema As String = SomeDataSet.GetXMLSchema()
        Dim sXML As String = SomeDataSet.GetXML()

        Dim ds As New DataSet
        '   ds.ReadXmlSchema( ??? )   ' What goes here?
        ds.ReadXml(readerXML)

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I think I need to convert sXMLSchema to some type of reader but I haven't been able to figure that part out yet. And I don't really want to have to save the schema to an XSD file just to use the ReadXmlSchema(FileName) overload.

Any suggestions on how to do this?

Thanks in advance.
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Question by:ZekeLA
  • 3
4 Comments
 
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Expert Comment

by:muhammadyasir
ID: 33605953
try this code
private void ReadSchemaFromXmlTextReader ( ) {
   // create the DataSet to read the schema into.
   DataSet thisDataSet = new DataSet ( );
   // set the file path and name. Modify this for your purposes.
   string filename = "mySchema.xml";
   // create a FileStream object with the file path and name.
   System.IO.FileStream myFileStream = new System.IO.FileStream
      ( filename,System.IO.FileMode.Open );
   // create a new XmlTextReader object with the FileStream.
   System.Xml.XmlTextReader myXmlTextReader = 
      new System.Xml.XmlTextReader ( myFileStream );
   // Read the schema into the DataSet and close the reader.
   thisDataSet.ReadXmlSchema ( myXmlTextReader );
   myXmlTextReader.Close ( );
}

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Author Comment

by:ZekeLA
ID: 33606418
Is there any way to do it without creating a file first?

I'm starting with a dataset. I want to pass that dataset using xml through a webservice. The client is not necessarily .NET so I can't / don't want to pass the dataset directly.

Thanks.
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LVL 1

Author Comment

by:ZekeLA
ID: 33606811
A developer friend of mine gave me the solution. I'll post it if it's not proprietary.
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Accepted Solution

by:
ZekeLA earned 0 total points
ID: 33799846
Here's how to do it with streams.
    Public Function XMLToDataSet( _
            ByVal sXml As String, _
            Optional ByVal sXmlSchema As String = "")

        ' Process XML
        Dim sr As StringReader = New StringReader(sXml)
        Dim xtr As XmlTextReader = New XmlTextReader(sr)

        ' Process Schema
        Dim srSchema As StringReader = Nothing
        Dim xtrSchema As XmlTextReader = Nothing
        If sXmlSchema.Length > 0 Then
            srSchema = New StringReader(sXmlSchema)
            xtrSchema = New XmlTextReader(srSchema)
        End If

        Dim ds As New DataSet
        If sXmlSchema.Length > 0 Then
            ds.ReadXmlSchema(xtrSchema)
        End If
        ds.ReadXml(xtr)

        Return ds
    End Function

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