qr code generator using vb.net FIGURE 9-3 Using alternating row colors. in .NET framework

Creator Code 39 in .NET framework FIGURE 9-3 Using alternating row colors.

FIGURE 9-3 Using alternating row colors.
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You might have noticed that the columns are added in the order that the data is defined in the NewsHeadLine class. You aren t limited to having the columns appear in this order, however, and you can override the default setting by using the DisplayIndex property. For example, the DataGrid has two columns, with the headlines listed in the first column and the links listed in the second. You could flip these around like this:
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GrdHeadline.Columns[0].DisplayIndex = 1; GrdHeadline.Columns[1].DisplayIndex = 0;
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You can further manipulate how the grid renders your data by using a data template. This is XAML that defines how you want the data to be laid out, including binding to specific fields.
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For example, the previous output samples had each cell in the grid bound to a particular element in the RSS feed. If you prefer to have two fields from the RSS feed within the same cell, you would achieve this by using a data template. Consider the following XAML:
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<UserControl xmlns:my="clr-namespace:System.Windows.Controls; assembly=System.Windows.Controls.Data" x:Class="DataGrid.Page" xmlns="http://schemas.microsoft.com/client/2007" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Width="400" Height="300"> <Grid x:Name="LayoutRoot" Background="White"> <my:DataGrid x:Name="GrdHeadline" AutoGenerateColumns="True"> <my:DataGrid.Columns> <my:DataGridTemplateColumn> <my:DataGridTemplateColumn.CellTemplate> <DataTemplate> <StackPanel Orientation="Vertical"> <TextBlock Text="123"></TextBlock> <TextBlock Text="{Binding strHead}"></TextBlock> <TextBlock Text="{Binding strPubDate}"></TextBlock> </StackPanel> </DataTemplate> </my:DataGridTemplateColumn.CellTemplate> </my:DataGridTemplateColumn> <my:DataGridTemplateColumn> <my:DataGridTemplateColumn.CellTemplate> <DataTemplate> <TextBlock Text="{Binding strLine}"></TextBlock> </DataTemplate> </my:DataGridTemplateColumn.CellTemplate> </my:DataGridTemplateColumn> </my:DataGrid.Columns> </my:DataGrid> </Grid> </UserControl>
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In this XAML, the DataGrid has its columns predefined using <my:DataGrid.Columns>. Within this, you can override the default columns template of one field per cell by defining a new <my:DataGridTemplateColumn.CellTemplate> for each cell, which will contain the code to define how you want the cell to be rendered. As you can see, you have defined only two cells, so this grid, regardless of the number of data fields, will have only two columns. The first column, defined by the first cell template, will be a StackPanel containing three text fields a hard-coded 123, the data-bound strHead property of the NewsHeadline class, and the data-bound strPubDate of the NewsHeadline class. The StackPanel stacks these fields vertically.
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The second column, defined by the second cell template, is a simple TextBlock that binds to the strLine field. You might have noticed that another field, strPubDate, that wasn t in the initial class sample is added here, so the class definition and binding code need to be updated. Here s the new class definition:
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public class NewsHeadLine { public string strHead { get; set; } public string strLine { get; set; } public string strDescription { get; set; } public string strPubDate { get; set; } }
And following is the new data binding code that binds the additional fields:
void client_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e) { XDocument xmlHeadlines = XDocument.Parse(e.Result); var headlines = from story in xmlHeadlines.Descendants("item") select new NewsHeadLine { strHead = (string)story.Element("title"), strLine = (string)story.Element("link"), strDescription = (string)story.Element("description"), strPubDate = (string)story.Element("pubDate") }; Deployment.Current.Dispatcher.BeginInvoke(() => { GrdHeadline.ItemsSource = headlines; }); }
One more quick change you need to make to see the new data: Change the default row height because it is currently capable of showing only one line, which would cause the vertical content in the first cell to be cropped. Also, turn off the automatic column definition because you want to override how the DataGrid automatically binds the data. You do this with the following code (put it in the Page constructor):
GrdHeadline.AutoGenerateColumns = false; GrdHeadline.RowHeight = 60;
Now when you execute this code, you see the DataGrid containing the defined column templates shown in Figure 9-4. It s not very pretty, but it does illustrate how you can control the appearance of your output from the DataGrid control.
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FIGURE 9-4 Using a data template to define how the data is rendered.
The DataGrid control has a huge API that deserves a book to describe it in its own right. However, what you ve learned about it over the last few pages should give you an appreciation for the flexibility that it provides, and you can use this basic information to take it to the next level as you build your Silverlight applications.
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