Solved

XSD + ADO.NET + XML -> Binding to Grid

Posted on 2009-05-07
8
429 Views
Last Modified: 2013-11-26
Hi,

I want to bind an XML file to a grid and be able to Add/Update/Delete.

All is working fine with the following code

--------------------------------------------------------------------------

Private dsLicence As New DataSet()

Private Sub frmMain_Load(..........)
dsLicence.ReadXmlSchema(My.Settings.XSD_PATH & "\LicencesShema.xsd")
dsLicence.ReadXml(My.Settings.XML_PATH & "\Licences.xml")

gridLicences.SetDataBinding(dsLicence, Nothing)
End Sub


Private Sub gridLicences_AfterCellUpdate(.....)
dsLicence.WriteXml(My.Settings.XML_PATH & "\Licences.xml")
End Sub

--------------------------------------------------------------------------

My problem is if the XML file is empty or does not exist i got an error. I was thinking that the use of the XSD file, even if the xml file was not existing, that i've got the base for the binding.

Is there any solution, cause for now i need to create the XML file and put some garbage data in it (Sample Data) and to block the user if he try to delete the last line of to grid.

Thanks for your help.

Here is my XML & XSD File
<?xml version="1.0"?>
<xs:schema xmlnss="http://www.w3.org/2001/XMLSchema"
xmlns:msdata="urn:schemas-microsoft-comml-msdata">
 
<xs:element name="Client">
<xs:complexType>
<xs:sequence>
<xs:element name="ID" type="xs:int" msdata:AutoIncrement="true" msdata:ReadOnly="true"/>
<xs:element name="COMPANYNAME" type="xs:string"/>
<xs:element name="NBUSER" type="xs:int" nillable="true"/> 
<xs:element name="NBUSERNOMME" type="xs:int" nillable="true"/>
<xs:element name="DATABASE" type="xs:string"/>
<xs:element name="EXPDATE" type="xs:dateTime" nillable="true"/>
</xs:sequence>
</xs:complexType>
</xs:element>
 
</xs:schema>
 
 
 
<?xml version="1.0" standalone="yes"?>
<NewDataSet>
<Client>
<ID>1</ID>
<COMPANYNAME>Sample Company</COMPANYNAME>
<NBUSER>1</NBUSER>
<NBUSERNOMME>1</NBUSERNOMME>
<DATABASE>Sample Database</DATABASE>
<EXPDATE>2009-04-27T00:00:00-04:00</EXPDATE>
</Client>
</NewDataSet>

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Question by:d1rtyw0rm
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8 Comments
 
LVL 27

Expert Comment

by:Dabas
ID: 24333744
What about simply checking the contents of dsLicenses before you call setDataBinding?

If dsLicence.Tables.Count <> 0 Then
   gridLicences.SetDataBinding(dsLicence, Nothing)
End If
0
 
LVL 2

Author Comment

by:d1rtyw0rm
ID: 24394785
Because it crash before ... on this line

dsLicence.ReadXml(My.Settings.XML_PATH & "\Licences.xml")
0
 
LVL 27

Expert Comment

by:Dabas
ID: 24400530
What if you wrap that line inside a try catch?


Private dsLicence As New DataSet()
 
Private Sub frmMain_Load(..........)
Try
    dsLicence.ReadXmlSchema(My.Settings.XSD_PATH & "\LicencesShema.xsd")
    dsLicence.ReadXml(My.Settings.XML_PATH & "\Licences.xml")
    gridLicences.SetDataBinding(dsLicence, Nothing)
Catch (ex as Exception)
    MessageBox.Show("Something seems to be wrong with the xml file")
End Try
 
End Sub

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LVL 2

Author Comment

by:d1rtyw0rm
ID: 24405105
First of all thanks a lot for your help but ...

That's exactly what i do for now, but what i want is to be able to RUN IT without an XML file, and the grid column to be based on my xsd file.

The problem that i have is that i'm in the obligation to create an XML file with at least one record, and i can't delete the last item of a grid because the XML will be empty and unavailible for the next use.

Hope that you understand what is my problem.
0
 
LVL 27

Expert Comment

by:Dabas
ID: 24405133
Sorry I do not.
0
 
LVL 2

Author Comment

by:d1rtyw0rm
ID: 24418535
All i want, is to be able to bind a grid to an empty XML file.

Based on an XSD file to setup the column title.
0
 
LVL 27

Accepted Solution

by:
Dabas earned 250 total points
ID: 24418664
What about this idea:

You create a non-empty xml, that confroms to your xsd file, just that it has empty nodes.

Something like in the snippet

You use the code I posted before, only that if the catch statement is reached you bind to this file?

Dabas
<?xml version="1.0" standalone="yes"?>
<NewDataSet>
<Client>
<COMPANYNAME>COMPANYNAME>
<DATABASE></DATABASE>
</Client>
</NewDataSet>

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Author Closing Comment

by:d1rtyw0rm
ID: 31579149
Thanks a lot for your patience, it's really appreciated !
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