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Listing 7-15. Adding Menu Items Dynamically private void Form1_Load(object sender, EventArgs e) { DataSet ds = new DataSet(); ds.ReadXml(Application.StartupPath + @"\menus.xml"); foreach (DataRow topmenu in ds.Tables[0].Rows) { ToolStripMenuItem item = new ToolStripMenuItem(topmenu["text"].ToString()); menuStrip1.Items.Add(item); DataRow[] submenus= topmenu.GetChildRows(ds.Relations[0]); foreach (DataRow submenu in submenus) { item.DropDownItems.Add(submenu[0].ToString()); } } } The code creates a new DataSet and reads the menus.xml file that we created earlier. While reading this file, the DataSet does some interesting things: 1. It observes the nesting of the XML data in the file and creates two DataTable objects. The first DataTable stores all the top menus, and the second DataTable stores all the submenus. 2. It creates DataRow objects in the top-menu DataTable and adds a DataColumn to them. The value contained in these columns is the value of the text attribute of the <topmenu> element. 3. It does a similar thing for the submenus DataTable, but loads the element values of the <submenu> items in the column. 4. It sets a DataRelation between the two tables by automatically adding an integer column to both of these DataTable objects.
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CHAPTER 7 XML IN A DO.NE T
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The code then iterates through all the rows from the first DataTable (the DataTable storing the top menus) and adds ToolStripMenuItem objects to the MenuStrip. The GetChildRows() method is called on each DataRow of the top-menu DataTable. This method accepts a DataRelation object and returns all the DataRow objects from the child table matching that relationship. In our case, the submenu DataTable is the child DataTable. The return value of GetChildRows() is an array of DataRow objects. The second foreach loop iterates through all the elements of this array and adds subitems to the DropDownItems collection of the ToolStripMenuItem class. If you run the application, you should see something similar to Figure 7-12.
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Reading Only the Schema Information
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The ReadXml()method allows you to read data and optionally schema information. However, at times you may need to extract just the schema information from the XML file and not the data. The DataSet class provides two methods that allow you to extract schema information from the source XML. They are ReadXmlSchema() and InferXmlSchema(). ReadXmlSchema() accepts the XML with an inline schema and reads just the schema part of it. The schema is then loaded into the DataSet. What if your XML document doesn t contain an inline schema That is where the InferXmlSchema() method comes into the picture. The InferXmlSchema() method observes the XML markup supplied and then creates a matching schema automatically. The schema is then loaded into the DataSet. To illustrate the use of both of these methods, you need to develop an application like the one shown in Figure 7-13.
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Figure 7-13. Application that reads schema
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The application consists of a text box for specifying the source XML file. The two radio buttons enable you to decide whether ReadXmlSchema() or InferXmlSchema() is to be called. The code for the Read button reads the schema into a DataSet and displays it in a message box. The code that reads the schema is shown in Listing 7-16. Listing 7-16. Using the ReadXmlSchema() and InferXmlSchema() Methods private void button1_Click(object sender, EventArgs e) { DataSet ds = new DataSet(); if (radioButton1.Checked) { ds.ReadXmlSchema(textBox1.Text); } if (radioButton2.Checked) { ds.InferXmlSchema(textBox1.Text,null); } MessageBox.Show(ds.GetXmlSchema()); } The code creates a new DataSet object. Depending on the radio button selected, the code calls either ReadXmlSchema() or InferXmlSchema(). ReadXmlSchema() accepts the source XML document as a parameter and loads the inline schema from the document into the DataSet. No data is loaded. The InferXmlSchema() method accepts the source XML document and an array of namespaces (null in our example) and infers the schema from the data. Again, no data is loaded. The loaded schema is shown in a message box by calling the GetXmlSchema() method of the DataSet. Figure 7-14 shows the schema loaded by using ReadXmlSchema(), whereas Figure 7-15 shows the schema loaded by using InferXmlSchema().
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