generate qr code programmatically c# FIGURE 11-8 The header of each group is determined dynamically by looking at the bound contents. in Visual C#.NET

Create QR Code ISO/IEC18004 in Visual C#.NET FIGURE 11-8 The header of each group is determined dynamically by looking at the bound contents.

FIGURE 11-8 The header of each group is determined dynamically by looking at the bound contents.
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To start out, let s take a look at the overall layout template of the ListView control:
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<asp:ListView ID="ListView1" runat="server" DataSourceID="ObjectDataSource1" GroupItemCount="5" OnItemDataBound="ListView1_ItemDataBound"> <ItemTemplate> <li><%# Eval("CompanyName") %></li> </ItemTemplate>
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<ItemSeparatorTemplate> <br /> </ItemSeparatorTemplate> <LayoutTemplate> <div id="groupPlaceholder" runat="server"> </div> </LayoutTemplate> <GroupTemplate> <asp:Label runat="server" ID="groupHeader" Text="Group" /> <hr /> <div id="itemPlaceholder" runat="server"> </div> <br /><br /><br /> </GroupTemplate> </asp:ListView>
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The group template is made of a Label control followed by an <hr> tag and the list of data items. Each bound item is expressed through an <li> tag. Let s see how to change the Text property of the groupHeader control for each group being created. Here s the structure of the ItemDataBound event handler:
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private int lastGroup = -1; protected void ListView1_ItemDataBound(object sender, ListViewItemEventArgs e) { // To assign the group a data-bound title, retrieve the data item first if (e.Item.ItemType == ListViewItemType.DataItem) { var currentItem = (ListViewDataItem) e.Item; CustomizeGroupHeader((ListView) sender, currentItem); } }
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The ListViewItemEventArgs argument contains an Item property that refers to the item being bound to data. This item can be of a few types InsertItem, EmptyItem, or DataItem. The list of feasible values is in the ListViewItemType enumerated type. In this case, we re interested only in data items that is, regular items showing some bound data. To put your hands on the real data being bound to the item, you need to cast the ListView item to the ListViewDataItem type, from which you can access a number of data-related properties:
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private void CustomizeGroupHeader(ListView root, ListViewDataItem currentItem) { // The type of the data item depends on the data you bound--in this case, // a collection of Customer objects var cust = (DAL.Customer) currentItem.DataItem; // Get a ListViewContainer object--the container of the group template Control container = currentItem.NamingContainer; if (container == null) return;
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11 The ListView Control
// Look up for a particular control in the group template--the Label Label groupHeader = (Label)container.FindControl("groupHeader"); if (groupHeader == null) return; // Figure out the 0-based index of current group. Note that the display index // refers to the index of the item being bound, not the group int groupIndex = currentItem.DisplayIndex / root.GroupItemCount; if (groupIndex != lastGroup) { // This is a new group lastGroup = groupIndex; // Update the UI groupHeader.Text = String.Format("Group {0} starting with <b>{1}</b>", groupIndex + 1, cust.CompanyName.Substring(0, 1).ToUpper()); } }
You first get a reference to the naming container of the item. This container is the wrapper control for the group template. By using the FindControl method, you gain access to the Label control in the group template. The final step entails determining the value for the Text property of the Label control. As mentioned, the ListView control doesn t provide any readymade information about groups. So you don t know about the index of the current group. The DisplayIndex property tells you only the index of the item being processed. Because the size of each group is fixed and is based on the GroupItemCount property you can easily obtain the 0-based index of the current group. You track the index of the current group in a global variable, and whenever a new group is found, you update the header.
Styling the List
Unlike other view controls, the ListView control doesn t feature the usual long list of style properties such as HeaderStyle, ItemStyle, SelectedItemStyle, and so forth. After a few years of industry use, Microsoft downsized the importance of style properties and their role. Today, as evidenced by the ListView control, in ASP.NET, CSS styles are emerging as the most effective and efficient way to modify the appearance of the markup.
Style Properties
ASP.NET controls let you set style attributes in two nonexclusive ways using the CssClass property and using style properties. The CssClass property takes the name of a CSS class and passes it on to the class attribute of the root HTML tag generated for the control. More often than not, though, ASP.NET controls produce a complex markup where multiple HTML tags are rendered together but yet need to be styled differently. Although this is far from
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