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The DataGrid also supports row details an optional, separate display area that appears just under the column values for a row. The row details area adds two things that you can t get from columns alone. First, the row details area spans the full width of the DataGrid and isn t carved into separate columns, which gives you more space to work with. Secondly, the row details area can be configured so it appears only for the selected row, allowing you to tuck the extra details out of the way when they re not needed. Figure 14-19 shows a DataGrid that uses both of these behaviors. The row details area shows the wrapped product description text, and it s only shown for the currently selected product.

To create this example, you need to first configure the display behavior of the row details area by setting the DataGrid.RowDetailsVisibility property. By default, this property is set to Hidden, which means the row details area is never shown. However, you can set it to Visible or VisibleWhenSelected (the option used in this example). Next, you need to define the content that s shown in the row details area by setting the DataGrid.RowDetailsTemplate property. In this case, the row details area uses a basic template that includes a TextBlock that shows the full product text and a Border element that wraps it: <data:DataGrid.RowDetailsTemplate> <DataTemplate> <Border Margin="10" Padding="10" BorderBrush="SteelBlue" BorderThickness="3" CornerRadius="5"> <TextBlock Text="{Binding Description}" TextWrapping="Wrap" FontSize="10"> </TextBlock> </Border> </DataTemplate> </data:DataGrid.RowDetailsTemplate> Other options include adding controls that allow you to perform various tasks (for example, getting more information about a product, adding it to a shopping list, editing it, and so on).

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After a few moments, the Manage Service Applications page will reappear with the new PPS application listed. It is now time to configure the application. If you are working with the default PPS instance, you should review the default settings, paying particular attention to the unattended service account, which should have the minimum privileges. See Security PerformancePoint Solutions earlier in this chapter to review why the USA is important. To begin configuring the service application, click on the name of the service (PPS Application in our case) to be taken to the Manage PerformancePoint Services page as shown in Figure 6 13.

Listing 5-5. Implementation of the FetchNextMessageBatch Method private void FetchNextMessageBatch( Conversation conversation, SqlConnection connection, SqlTransaction transaction) { SqlCommand cmd; if (conversation != null || m_appLoaderProcName == null) { cmd = BuildReceiveCommand(conversation, connection, transaction); SqlDataReader dataReader = cmd.ExecuteReader(); m_reader.Open(dataReader); } else if (m_appLoaderProcName != null) { cmd = BuildGcgrCommand(connection, transaction); SqlDataReader dataReader = cmd.ExecuteReader(); if (!LoadState(dataReader, connection, transaction)) { dataReader.Close(); return; } m_reader.Open(dataReader); } } FetchNextMessageBatch builds the needed T-SQL statements for retrieving messages from the associated queue. When state information is also retrieved for the current conversation group, FetchNextMessageBatch calls either BuildGcgrCommand or BuildReceiveCommand. 6 provides more information about state handling within Service Broker applications. As soon as the messages are retrieved into an instance of a SqlDataReader, the SqlDataReader is passed to the Open method of the MessageReader class. The main purpose of this class is to create instances of the Message class out of the messages read from the queue. As soon as GetConversation returns a conversation, the Receive method is called on that conversation. Receive calls Read of the MessageReader class. Listing 5-6 shows the implementation of the Read method. Listing 5-6. Implementation of the Read Method public Message Read(Conversation conversation) { if (m_curMsg == null || m_curMsg.Conversation.Handle != conversation.Handle) return null; Message result = m_curMsg; AdvanceCursor(); return result; }

As with an ordinary list control, the DataGrid allows the user to select individual items. You can react to the SelectionChanged event when this happens. To find out what data object is currently selected, you can use the SelectedItem property. If you want the user to be able to select multiple rows, set the SelectionMode property to Extended. (Single is the only other option and the default.) To select multiple rows, the user must hold down the Shift or Ctrl key. You can retrieve the collection of selected items from the SelectedItems property.

Figure 6 13. Manage PerformancePoint Services page On the Manage PerformancePoint Service page, there are various settings to configure, which we ll discuss now. While most of the settings can be left to their default values, some need to be configured in order to address specific requirements.

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