This article is compatible with the latest version of Silverlight.
What is a Pivot table/grid? According to Wikipedia it is a data summarization tool found in spreadsheet applications. Still when I was a child I learned that people understand the best when they see an example.
Consider you have a table that contains the nutrition of given food,say a pizza:
| Group | Name | Quantity |
| Carbohydrates | Total carbohydrates | 27.3 |
| Carbohydrates | Total disaccharides | 5.7 |
| Carbohydrates | Total polysaccharides | 21.6 |
| minerals | Calcium | 147 |
| minerals | Phosphorus | 150 |
| minerals | Potassium | 201 |
| minerals | copper | 0.13 |
| minerals | Magnesium | 19 |
| minerals | sodium | 582 |
| minerals | Selenium | 4 |
| minerals | Total iron | 0.7 |
| minerals | Zinc | 1.07 |
| Vitamins | Beta-carotene | 173.8 |
| Vitamins | Nicotinic | 1.5 |
| Vitamins | Total vitamin B6 | 0.127 |
| Vitamins | Total vitamin D | 0.3 |
| Vitamins | Total vitamin E | 2.1 |
| Vitamins | Vitamin B1 | 0.1 |
| Vitamins | Vitamin B12 | 0.59 |
| Vitamins | Vitamin B2 | 0.16 |
| Vitamins | Vitamin C | 10 |
In the data above you see that every nutrition is contained in a specific Group - 3 groups and 21 nutrition in total. To display the nutrition in a more meaningful way in most cases you need to group the nutrition (rows in the general case) by their Group attribute and display them in columns instead of in rows. Now we are closer to what we call a Pivot table - group and turn rows into columns.
So the above table displayed in a Pivot would look like that:
| Carbohydrates | minerals | Vitamins | |||
| Total carbohydrates | 27.3 | Calcium | 147 | Beta-carotene | 173.8 |
| Total disaccharides | 5.7 | Phosphorus | 150 | Nicotinic | 1.5 |
| Total polysaccharides | 21.6 | Potassium | 201 | Total vitamin B6 | 0.127 |
| copper | 0.13 | Total vitamin D | 0.3 | ||
| Magnesium | 19 | Total vitamin E | 2.1 | ||
| sodium | 582 | Vitamin B1 | 0.1 | ||
| Selenium | 4 | Vitamin B12 | 0.59 | ||
| Total iron | 0.7 | Vitamin B2 | 0.16 | ||
| Zinc | 1.07 | Vitamin C | 10 |
I searched for a 3rd party control that can help me achieve this goal out of the Box,but I Couldn't find one. Looking for a way to do it I finally made it work with the help of LINQ - for grouping and the Telerik RadTreeView for Silverlight - for displaying.
Loading the data with LINQ
First,consider we have the initial table of nutrition exported to XML. The output look like that:
<?xmlversion="1.0"encoding="utf-8"?><Nutritions> <NutritionGroup="Carbohydrates"Name="Total carbohydrates"Quantity="27.3"></Nutrition> <NutritionGroup="Carbohydrates"Name="Total disaccharides"Quantity="5.7"></Nutrition> <NutritionGroup="Carbohydrates"Name="Total polysaccharides"Quantity="21.6"></Nutrition> <NutritionGroup="minerals"Name="Calcium"Quantity="147"></Nutrition> <NutritionGroup="minerals"Name="Phosphorus "Quantity="150"></Nutrition>
Create a business object Nutrition that will be used later when loading the XML with LINQ.
publicclassNutrition{ publicstringGroup {get;set; } publicstringName {get;set; } publicstringQuantity {get;set; }}
and NutritionGroup:
public class NutritionGroup
{
public string NutritionGroupHeader { get; set; }
public Collection<Nutrition> Nutritions { get; set; }
}
Now,it's time to load the XML document with LINQ. Martin Mihaylov published a great article on using LINQ to XML in Silverlight so if you are not familiar you'd better go read it first.
List data = ( from nutritioninnutritionsDoc.Descendants("Nutrition") selectnewNutrition { Group = nutrition.Attribute("Group").Value, Name = nutrition.Attribute("Name").Value, Quantity = nutrition.Attribute("Quantity").Value } ).ToList();
Grouping the data with LINQ and building the tree
Ok,this is the core of this article. The ability to group is a great feature in LINQ. It really does simplify the code to minimum.
We need to group by the Group attribute.
IEnumerable<string,Nutrition>> query = data.GroupBy( nutrition => nutrition.Group );
Now,each nutrition group should be a root node in the tree and each nutrition in this group should be added to the nutritions in the corresponding root. When the ItemSource property is set to the collection of nutrition groups,the RadTreeView will be populated with the corresponding data:
Collection<NutritionGroup> nutritions =newCollection<NutritionGroup>();foreach( IGrouping<string,Nutrition> nutritionGroupinquery ){ NutritionGroup group =newNutritionGroup() { NutritionGroupHeader = nutritionGroup.Key, }; group.Nutritions =newCollection<Nutrition>(); foreach( Nutrition nutritioninnutritionGroup ) { group.Nutritions.Add( nutrition ); } nutritions.Add( group );}nutritionTree.ItemsSource = nutritions;
Ok,we are almost over. Let's take a look at the NutritionGroupTemplate and NutritionTemplate that we will use. First,we will need the following schema:
xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
Having that,follows both the templates:
NutritionGroupTemplate
<telerik:HierarchicalDataTemplatex:Key="NutritionGroupTemplate" ItemsSource="{Binding Nutritions}"ItemTemplate="{StaticResource NutritionTemplate}"> <BorderBorderThickness="1"BorderBrush="#ececec"CornerRadius="4"> <BorderBorderThickness="1"BorderBrush="White"Padding="1"CornerRadius="4"> <Border.Background> <LinearGradientBrushEndPoint="0.5,1"StartPoint="0.5,0"> <GradientStopColor="#f8f8f8"/> <GradientStopColor="#ececec"Offset="1"/> </LinearGradientBrush> </Border.Background> <TextBlockText="{Binding NutritionGroupHeader}"FontWeight="Bold"/> </Border> </Border></telerik:HierarchicalDataTemplate>
NutritionTemplate
<telerik:HierarchicalDataTemplatex:Key="NutritionTemplate"> <StackPanelOrientation="Horizontal"> <TextBlockText="{Binding Name}"Width="150"></TextBlock> <TextBlockText="{Binding Quantity}"FontWeight="Bold"></TextBlock> </StackPanel></telerik:HierarchicalDataTemplate>
The default orientation of the nodes in the RadTreeView,as expected,is vertical. However in our case it makes more sense to arrange the root nodes on the horizontal and only the child elements to the vertical:
<Styletargettype="telerik:RadTreeViewItem"x:Key="TreeViewItemStyle"> <SetterProperty="IsExpanded"Value="True"></Setter> <SetterProperty="ItemsPanel"> <Setter.Value> <ItemsPanelTemplate> <StackPanelHorizontalAlignment="Center" Margin="4,6"Orientation="Vertical"/> </ItemsPanelTemplate> </Setter.Value> </Setter></Style>
And the RadTreeView element:
<telerik:RadTreeView x:Name="nutritionTree"
ItemTemplate="{StaticResource NutritionGroupTemplate}"
ItemContainerStyle="{StaticResource TreeViewItemStyle}">
<telerik:RadTreeView.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel VerticalAlignment="Top" Orientation="Horizontal" />
</ItemsPanelTemplate>
</telerik:RadTreeView.ItemsPanel>
</telerik:RadTreeView>
版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 [email protected] 举报，一经查实，本站将立刻删除。