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In this chapter you learned about Silverlight and how to use it to create sophisticated UIs that break the HTML barrier but deploy like any browser-based application. Some basic steps introduced the core features of Silverlight. You examined the security model and saw how to create Silverlight applications using either Web Parts or application pages. Using the client object model, you can use a SharePoint API style of access from any remote location based on web services. Several examples showed how to create simple XAML-based UIs with code that accesses the SharePoint back end to retrieve and change data from SharePoint lists. Using simple expressions you can limit the amount of data retrieved while obtaining exactly what you want. This improves performance and aids in creating fast UIs.

In this chapter we will focus on extending SharePoint by using UI elements that are not directly part of the SharePoint Foundation framework. The following topics are covered: Developing custom charts Using map services to display geospatial data

Figure 2-16. Recipe 2-9 s test application UI Unlike in Recipe 2-1, where we demonstrated how to add a class reference to an application but did not specify a data template, we do implement a simple data template for the ListBox control here, to show that the XML data is read in properly. We ll cover the details of data binding and data templates in 4. Listings 2-18 and 2-19 show the relevant code.

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For integrating complex charts or dashboards, we will introduce various data access scenarios, ranging from basic CAML queries to direct database access with LINQ to SQL. Furthermore, we will give you an overview of the features within the Microsoft Chart Control framework. The final section of this chapter examines map services and shows how to integrate these services into SharePoint.

Listing 2-18. Recipe 2-9 s MainPage.xaml File <UserControl x:Class="Ch02_ProgrammingModel.Recipe2_9.MainPage xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:data="clr-namespace:Ch02_ProgrammingModel.Recipe2_9" Width="600" Height="500" > <UserControl.Resources> <data:ApressBooks x:Key="ApressBooksDS" /> </UserControl.Resources> <Grid x:Name="LayoutRoot" Background="White"> <ListBox Margin="4,4,4,4" ItemsSource="{Binding Mode=OneWay, Path=ApressBookList, Source={StaticResource ApressBooksDS}}" > <ListBox.ItemTemplate> <DataTemplate> <StackPanel Margin="2,2,2,2"> <TextBlock Text="{Binding Path=ISBN}" Margin="0,0,0,2"/> <TextBlock Text="{Binding Path=Title}" Margin="0,0,0,2"/> <TextBlock Width="550" Text="{Binding Path=Description}" TextWrapping="Wrap" Margin="0,0,0,10"/> </StackPanel> </DataTemplate> </ListBox.ItemTemplate> </ListBox> </Grid> </UserControl> Listing 2-19. Recipe 2-9 s ApressBooks.cs Class File using using using using using using System; System.Collections.Generic; System.Linq; System.Xml; System.Xml.Linq; System.Collections;

Before you can start to implement your own charts, dashboards, or maps, you need to decide on the most appropriate data access strategy for the situation. It s important that you have a clear view of your requirements, because the wrong choice of data access method could result in a nasty surprise later. You should ask yourself the following questions: Data location: Where is the source of the data to be queried Is it only in basic SharePoint lists Or is there additional data, possibly connected by business data services Data size: How many items do you expect in your lists How much will the lists grow over time Query complexity: How complex will the queries be Do you have to join many lists together Are you heavily using grouping and aggregation (GROUP BY) Performance: How many queries do you expect on a typical (dashboard) page How many users are accessing this page in a given interval (e.g., queries per hour) What should the maximum page load time be

There are several ways to query data from the SharePoint database that we will briefly recap here. For in-depth coverage of the different data access methods, refer back to 4. More information about efficient data access can be found in 5.

namespace Ch02_ProgrammingModel.Recipe2_9 { public class ApressBooks { private List<ApressBook> _apressBookList; public List<ApressBook> ApressBookList {

Up to this stage, we have covered a lot about SharePoint and its customization possibilities. As developers, we can easily build our own Web Parts or application pages using the integrated SharePoint web controls. There is one important aspect we have not mentioned yet, though: the ability to build our own charts, dashboards, and map views. These graphical elements are indispensable for most modern business applications. This section covers several approaches to integrating charting capabilities into your own application pages or Web Parts: Microsoft Chart Controls Google Chart API Google Visualization API

budget are incorrectly calculated. In the next chapter we ll look at ways to resolve this issue, and thereby bridge the gap between the agile methodologies and traditional project management.

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