There are many ways you can attach your ViewModel to your View in WPF; here are some of the ways.
Direct reference to the ViewModel
This is the simplest method.
<UserControl xmlns:vm="clr-namespace:MyWPFUserControls">
<UserControl.DataContext>
<vm:MeterReaderViewModel/>
</UserControl.DataContext>
Use a CollectionViewSource
<Window.Resources>
<CollectionViewSource x:Key="categoryViewSource" d:DesignSource="{d:DesignInstancemy:Category, CreateList=True}"
/>
</Window.Resources>
<Grid DataContext="{StaticResource categoryViewSource}">
...
private void Window_Loaded(object sender, RoutedEventArgs e)
{
System.Windows.Data.CollectionViewSource categoryViewSource =
((System.Windows.Data.CollectionViewSource)(this.FindResource("categoryViewSource")));
// Load is an extension method on
IQueryable, defined in the System.Data.Entity namespace.
// This method enumerates the results
of the query, much like ToList but without creating a list.
// When used with Linq to Entities this
method creates the entity instances and adds to the context.
_context.Categories.Load(); // Load is defined in the
System.Data.Entity namespace.
// After the data is loaded call the
DbSet<T>.Local property to use the DbSet<T> as a binding source.
categoryViewSource.Source
= _context.Categories.Local;
}
Reference
CollectionViewSource – more simple version
<UserControl.Resources>
<CollectionViewSource x:Key="MainDataSource"/>
</UserControl.Resources>
<Grid DataContext="{Binding Source={StaticResource MainDataSource}}">
var collectionView = (CollectionViewSource)Resources["MainDataSource"];
collectionView.Source = entitiesContext.ArCustomers;
Call a method
Note the "Class" reference on the second line.
<Window
x:Class="U2UConsult.DockOfTheBay.DataGridSampleWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:U2UConsult.DockOfTheBay"
xmlns:toolkit="http://schemas.microsoft.com/wpf/2008/toolkit"
Title="WPF DataGrid CRUD Sample"
SizeToContent="WidthAndHeight"
Icon="/DataGridSample;component/dotbay.png"
>
...
<toolkit:DataGrid
x:Name="DriversDataGrid"
ItemsSource="{Binding Source={x:Static local:FormulaOneDriver.GetAll}}"
RowEditEnding="DriversDataGrid_RowEditEnding"
AutoGenerateColumns="False"
CanUserAddRows="True"
Reference
Call a method in an ObjectDataProvider
<Window ...>
<Window.Resources>
<!-- create an instance of our
DataProvider class -->
<ObjectDataProvider x:Key="CustomerDataProvider"
ObjectType="{x:Type
local:CustomerDataProvider}"/>
<!-- define the method which is
invoked to obtain our data -->
<ObjectDataProvider x:Key="Customers"
ObjectInstance="{StaticResource
CustomerDataProvider}"
MethodName="GetCustomers"/>
</Window.Resources>
<DockPanel DataContext="{Binding Source={StaticResource
Customers}}">
<dg:DataGrid ItemsSource="{Binding}" Name="dataGrid"/>
</DockPanel>
</Window>
public class
CustomerDataProvider
{
private
CustomersTableAdapter adapter;
private NorthwindDataSet
dataset;
public
CustomerDataProvider()
{
dataset = new
NorthwindDataSet();
adapter = new
CustomersTableAdapter();
adapter.Fill(dataset.Customers);
}
public DataView
GetCustomers()
{
return
dataset.Customers.DefaultView;
}
}
Reference
OnStartup
You can initialize the View and View Model by using an OnStartup() override added to App.xaml.cs. The View is bound to the View Model by setting the View Model as the data context for the View:
protected override void OnStartup(StartupEventArgs e)
{
base.OnStartup(e);
var mainWindow = new MainWindow();
var mainWindowViewModel = new MainWindowViewModel();
mainWindow.DataContext = mainWindowViewModel;
mainWindow.Show();
}
Reference
http://www.codeproject.com/Articles/182880/Using-the-Microsoft-Desktop-Stack-Part-3-Using-Ent
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