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CHAPTER 10 MANAGED PROVIDERS OF DATA ACCESS
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<head runat="server"> <title>DataSet IE</title> </head> <body> <form id="form1" runat="server"> <asp:DropDownList Runat=server ID=ddlPub AutoPostBack=true OnSelectedIndexChanged="ddlPub_SelectedIndexChanged" /> <asp:GridView Runat=server ID=gvTitle EnableViewState="false" BorderWidth="1px" BackColor="White" GridLines="Vertical" CellPadding="4" BorderStyle="None" BorderColor="#DEDFDE" ForeColor="Black"> <FooterStyle BackColor="#CCCC99" /> <PagerStyle ForeColor="Black" HorizontalAlign="Right" BackColor="#F7F7DE" /> <HeaderStyle ForeColor="White" Font-Bold="True" BackColor="#6B696B" /> <AlternatingRowStyle BackColor="White" /> <SelectedRowStyle ForeColor="White" Font-Bold="True" BackColor="#CE5D5A" /> <RowStyle BackColor="#F7F7DE" /> </asp:GridView> </form> </body> </html> Most of these attributes just establish the look and feel that the page will have. The important bits are the ones that determine that the DropDownList will automatically post back when a choice is made from the list, and the name of the method that will fire on the server when this occurs (AutoPostBack and OnSelectedIndexChanged). From the code-behind, then, you have only to add the code that will bind the list, and the code that will bind the grid when the user makes a choice from the list. You ll bind the DropDownList when the page first loads (again, from DataSetIE.aspx in Web10): protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { ddlPub.DataSource = GetSourceData().Tables["Publishers"];
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CHAPTER 10 MANAGED PROVIDERS OF DATA ACCESS
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ddlPub.DataTextField = "pub_name"; ddlPub.DataValueField = "pub_id"; ddlPub.DataBind(); ddlPub.Items.Insert(0, ""); } } Here you re drilling right into the reference of the DataSet s first table, and handing the reference straight to the data-binding engine. After the list is bound, you pop an empty item into the first position of the list, so that the page will not render with a default choice of publisher. When the user makes a selection, you need to bind your GridView. Since you have the data cached, and you have a relationship established between publishers and titles, this will only take a few lines of code. For this operation, you ll use the DataView object, leveraging its intrinsic abilities to establish row filters and navigate relationships: protected void ddlPub_SelectedIndexChanged(object sender, EventArgs e) { DataView dv = new DataView( GetSourceData().Tables["Publishers"], string.Format("pub_id = '{0}'", ddlPub.SelectedValue), "", DataViewRowState.CurrentRows); if (dv.Count > 0) { gvTitle.DataSource = dv[0].CreateChildView("Pub_Title"); gvTitle.DataBind(); } } Although this is only a few lines of code, you re making the DataView do quite a bit of work in its constructor. The first parameter to the constructor is, of course, the DataTable you want to create a view on. The second is the RowFilter you re applying to the view. Here you use the value of the drop-down list to describe the publisher the user has selected. Since you re filtering on the primary key of the publishers table, you know you only ever have one row in the result set of the view. The next parameter is a sort, which you re leaving blank as there s no sense in sorting a single row, and the last is an enum indicating the state of the rows you want to query. CurrentRows should be the default, and there should be an overridden constructor that omits this argument. Since there is not, you provide it here. After the constructor finishes its work, you ll have a DataView object with a single row in it, corresponding to the publisher the user has selected in the interface. To bind the grid, then, you ll use the CreateChildView method of the DataViewRow class, which allows you to navigate from a row of data in the parent view to its collection of children in a new view that gets created by the method. You can pass an instance of a relation to this method, or just name a relation, as you re doing here. Another handy facility of the DataSet is the capability to bind a column to an expression. You can use this to create simple aggregates across relationships. You can add an OrderTotal
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