Infer the Schema of an XML Document in .NET framework

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Infer the Schema of an XML Document
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1. In the code editor, select btnInferSchema 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 code to the event handler: 3. Dim newDS As New System.Data.DataSet() 4. Dim nsStr() As String 5. 6. newDS.InferXmlSchema("dataOnly.xml", nsStr) 7. 8. Me.daCategories.Fill(newDS.Tables("Categories")) 9. Me.daProducts.Fill(newDS.Tables("Products")) 10. newDS.Relations.Add("CategoriesProducts", _ 11. newDS.Tables("Categories").Columns("CategoryID"), _ newDS.Tables("Products").Columns("CategoryID")) The first two lines declare DataSet and String array variables, while the third line passes them to the InferXmlSchema method. The remaining code adds a new DataRelation to the new DataSet, fills it, and then calls the SetBindings utility function that binds the XML form controls to the DataSet. 12. Press F5 to run the application. 13. Click Infer Schema. The application displays the data in the form controls.
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14. Close the application.
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1. In the form designer, double-click Infer Schema. Visual Studio adds the event handler to the code. 2. Add the following code to the event handler: 3. System.Data.DataSet newDS = new System.Data.DataSet(); 4. string[] nsStr = {}; 5. 6. newDS.InferXmlSchema("dataonly.xml", nsStr);
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7. 8. newDS.Relations.Add("CategoriesProducts", 9. 10. newDS.Tables["Categories"].Columns["CategoryID"], newDS.Tables["Products"].Columns["CategoryID"]);
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11. this.daCategories.Fill(newDS.Tables["Categories"]); 12. this.daProducts.Fill(newDS.Tables["Products"]); SetBindings(newDS); The first two lines declare DataSet and String array variables, while the third line passes them to the InferXmlSchema method. The remaining code adds a new DataRelation to the new DataSet, fills it, and then calls the SetBindings utility function that binds the XML form controls to the DataSet. 13. Press F5 to run the application. 14. Click Infer Schema. The application displays the data in the form controls.
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15. Close the application. The ReadXml Method The DataSet s ReadXml method reads XML data into a DataSet. Optionally, it may also create or modify the DataSet schema. As shown in Table 15-3, the ReadXml method supports the same input sources as the other DataSet XML methods we ve examined. Table 15-3: ReadXml Methods Method ReadXml(Stream) Description Reads an XML schema and data to the specified stream Reads an XML schema and data to the file specified in the string parameter Reads an
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ReadXml(String)
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ReadXml(TextReader)
Table 15-3: ReadXml Methods Method Description XML schema and data to the specified TextReader ReadXml(XmlReader) Reads an XML schema and data to the specified XmlReader Reads an XML schema, data, or both to the specified stream, as determined by the XmlReadMo de Reads an XML schema, data, or both to the file specified in the string parameter, as determined by the XmlReadMo de Reads an XML schema, data, or both to the specified TextReader, as determined by the XmlReadMo de Reads an XML schema, data, or both to the specified XmlReader, as
ReadXml(Stream, XmlReadMode)
ReadXml(String, XmlReadMode)
ReadXml(TextReader, XmlReadMode)
ReadXml(XmlReader, XmlReadMode)
Table 15-3: ReadXml Methods Method Description
determined by the XmlReadMo de The ReadXml method exposes an optional XmlReadMode parameter that determines how the XML is interpreted. The possible values for XmlReadMode are shown in Table 15-4. Table 15-4: ReadXMLMode Values Value Auto Description Chooses a ReadMode based on the contents of the XML Reads an inline schema and then loads the data, adding DataTables as necessary Loads data into an existing DataSet, ignoring any schema information in the XML Infers a DataSet schema to the XML, ignoring any inline schema information Reads DiffGram information into an existing DataSet schema Adds XML fragments that match the existing DataSet
ReadSchema
IgnoreSchema
InferSchema
DiffGram
Fragment
Table 15-4: ReadXMLMode Values Value Description schema to the DataSet and ignores those that do not Unless the ReadXml method is passed an XmlReadMode parameter of DiffGram, it does not merge the data that it reads with existing rows in the DataSet. If a row is read with the same primary key as an existing row, the method will throw an exception. A DiffGram is an XML format that encapsulates the current and original versions of an element, along with any DataRow errors. The nominal structure of a DiffGram is shown here: <diffgr:diffgram xmlns:msdata="urn:schemas-microsoft -com:xml-msdata" xmlns:diffgr="urn:schemas-microsoft-com:xml-diffgram-v1" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <ElementName> </ElementName> <diffgr:before> </diffgr:before> <diffgr:errors> </diffgr:errors> </diffgr:diffgram> In the real DiffGram, the first section (shown as <ElementName> </ElementName> in the example) will have the name of the complexType defining the DataRow. The section contains the current version of the contents of the DataRow. The <diffgr:before> section contains the original version, while the <diffgr:errors> section contains error information for the row. In order for DiffGram to be passed as the XmlReadMode parameter, the data must be in DiffGram format. If you need to merge XML that is written in standard XML format with existing data, create a new DataSet and then call the DataSet. Merge method to merge the two sets of data. Load XML Data Using ReadXml
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