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1. In the code editor, select btnDocument in the Control Name combo box, and then select Click in the Method Name combo box. Visual Studio adds the event handler to the code. 2. Add the following lines to the event handler: 3. Dim myXDD As System.Xml.XmlDataDocument 4. 5. myXDD = New System.Xml.XmlDataDocument(Me.dsMaster1) 6. myXDD.Load("dataOnly.xml") 7. SetBindings(Me.dsMaster1) The first line declares the XmlDataDocument variable, while the second line synchronizes it with the dsMaster1 DataSet. The third line loads data into the XmlDataDocument. The final line binds the form controls to dsMaster1. Because the DataSet has been synchronized with the myXDD XmlDataDocument, the data loaded into myXDD will be available in dsMaster1. 8. Press F5 to run the application. 9. Click Documents. The application displays the data in the form.
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10. Close the application.
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1. In the form designer, double-click Document. Visual Studio adds the event handler to the code. 2. Add the following lines to the event handler: 3. System.Xml.XmlDataDocument myXDD; 4. 5. myXDD = new System.Xml.XmlDataDocument(this.dsMaster1);
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6. myXDD.Load("dataOnly.xml"); 7. SetBindings(this.dsMaster1); The first line declares the XmlDataDocument variable, while the second line synchronizes it with the dsMaster1 DataSet. The third line loads data into the XmlDataDocument. The final line binds the form controls to dsMaster1. Because the DataSet has been synchronized with the myXDD XmlDataDocument, the data loaded into myXDD will be available in dsMaster1. 8. Press F5 to run the application. 9. Click Documents. The application displays the data in the form.
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10. Close the application.
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15 Quick Reference
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To Retrieve an XML schema from a DataSet Retrieve data from a DataSet in XML format Create a DataSet schema from an XML schema Infer the schema of an XML document Do this Use the DataSet s GetXmlSchema method: XmlSchemaString = myDataSet.GetXmlSchema()
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Use the DataSet s GetXml method: XmlDataString = myDataSet.GetXml()
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Use the DataSet s ReadXmlSchema method: myDataSet.ReadXmlSchema("schema.xsd")
Use the DataSet s InferXmlSchema method: myDataSet.InferXmlSchema("data.xml", string[])
To Load XML data into a DataSet Create an XML schema from a DataSet Write data to an XML document Create a synchroniz ed XML view of a DataSet
Do this Use the DataSet s ReadXml method: myDataSet.ReadXml("data.xml") Use the DataSet s WriteXmlSchema method: myDataSet.WriteXmlSchema("schema.xsd")
Use the DataSet s WriteXml method: myDataSet.WriteXml("data.xml") Create an instance of an XmlDataDocument that references the DataSet: Dim myXDD As System.Xml.XmlDataDocument myXDD = New System.Xml.XmlDataDocument(myDataSet)
16:
Using ADO in the .NET Framework
Overview
In this chapter, you ll learn how to: Establish a reference to the ADO and ADOX COM libraries Create an ADO connection Retrieve data from an ADO Recordset Update an ADO Recordset Create a database using ADOX Add a table to a database using ADOX In the previous two chapters, we examined using XML data with Microsoft ADO.NET objects. In this chapter, we ll look at the interface to another type of data, legacy data objects created by using previous versions of ADO. We ll also examine the ADOX library, which provides the ability to create database objects under programmatic control. This functionality is not available in ADO.NET, although you can execute DDL statements such as CREATE TABLE on servers that support them.
Understanding COM Interoperability
Maintaining interoperability with COM components was one of the design goals of the Microsoft .NET Framework, and this achievement extends to previous versions of ADO. By using the COM Interop functions provided by the .NET Framework, you can gain access to all the objects, methods, and events that are exposed by any COM object simply by establishing a reference to it. This includes previous versions of ADO and COM objects that you ve developed using them. After the reference has been established, the COM objects behave just as though they were .NET Framework classes. What happens behind the scenes, of course, is more complicated. When a reference to any COM object, including ADO or ADOX, is declared,
the .NET Framework creates an interop assembly that handles communication between the .NET Framework and COM. The interop assembly handles a number of tasks, but the most important is data type marshaling. Table 16-1 shows the type conversion performed by the interop assembly for standard COM value types. Table 16-1: COM Data Type Marshaling Com Data Type .NET Framew ork Type Int32 SByte Int16 Int32 Int64 Byte UInt16 UInt32 UInt64 Single Double Boolean IntPtr Int16 or IntPtr Int32 String String String Object Decimal DateTime Guid Decimal Object Object type[]
bool char, small Short long, int hyper unsigned char, byte wchar_t, unsigned short unsigned long, unsigned int unsigned hyper float double VARIANT_BOOL void * HRESULT SCODE BSTR LPSTR LPWSTR VARIANT DECIMAL DATE GUID CURRENCY IUnknown * IDispatch * SAFEARRAY(type)
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