Using ADO.NET Entity Data Model in WPF

Raj Kumar
14y
40.8k
0
0
100
Article

This article will show you how to fetch and show data from database using ADO.NET Entity Data Model in WPF. What is ADO.NET Entity Data Model? When one takes a look at the amount of code that the average application developer must write to address the impedance mismatch across various data representations (for example objects and relational stores) it is clear that there is an opportunity for improvement. Indeed, there are many scenarios where the right framework can empower an application developer to focus on the needs of the application as opposed to the complexities of bridging disparate data representations.

A primary goal of the upcoming version of ADO.NET is to raise the level of abstraction for data programming, thus helping to eliminate the impedance mismatch between data models and between languages that application developers would otherwise have to deal with. Two innovations that make this move possible are Language-Integrated Query and the ADO.NET Entity Framework. The Entity Framework exists as a new part of the ADO.NET family of technologies. ADO.NET will LINQ-enable many data access components: LINQ to SQL, LINQ to DataSet and LINQ to Entities.

Getting Started:

First of all add a new ADO.NET Entity Data Model template.

Figure1.

Choose your model contents.

Figure2.

Select data connection if already made otherwise make a new connection step by step.

Figure3.

Select database object whatever you want use.

Figure4.

Finally it has .edmx extension that will look like this, here you can update name if you want.

Figure5.

Now let's start work on window or page if you want show data in data grid then you have to add refrence of WPF toolkit (in VisualStudio2008 only). Then you have to add namespace on top of window like this:

xmlns:dataGrid=http://schemas.microsoft.com/wpf/2008/toolkit

here is my data grid.

<Grid>

<dataGrid:DataGrid AutoGenerateColumns="True" x:Name="MyGrid"></dataGrid:DataGrid>

</Grid>

public partial class Window2 : Window

{

NORTHWNDEntities2 cd;

public Window2()

{

InitializeComponent();

}

private void Window_Loaded(object sender, RoutedEventArgs e)

{

cd = new NORTHWNDEntities2();

IEnumerable<Customers> customers = (from p in cd.Customers select p).Take(20);

MyGrid.ItemsSource = customers;

}

Output will be like this:

Figure6.

You can set your startup page name App.xaml file.

<Application x:Class="TestADONETEntityDataModel.App"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

StartupUri="Window2.xaml">

<Application.Resources>

</Application.Resources>

</Application>

If you want show you data in other controls like labels

<Grid>

<Label Height="28" Margin="19,31,139,0" Name="label1" VerticalAlignment="Top">Company Name: </Label>

<Label Height="28" Margin="19,56,139,0" Name="label2" VerticalAlignment="Top">Contact Name: </Label>

<Label Height="28" Margin="19,7,0,0" Name="CustomerID" VerticalAlignment="Top" HorizontalAlignment="Left" Width="320">Customer ID</Label>

<Label Height="28" Margin="12,0,0,56" Name="label3" VerticalAlignment="Bottom" HorizontalAlignment="Left" Width="120">Total Customers: </Label>

<Label Height="28" HorizontalAlignment="Left" Margin="19,75,0,0" Name="label4" VerticalAlignment="Top" Width="120">Contact Title: </Label>

<Label Height="28" HorizontalAlignment="Left" Margin="19,98,0,0" Name="label5" VerticalAlignment="Top" Width="120">Country: </Label>

<Label Height="28" HorizontalAlignment="Left" Margin="19,117,0,0" Name="label6" VerticalAlignment="Top" Width="120">Address: </Label>

<Label Height="28" HorizontalAlignment="Left" Margin="19,167,0,0" Name="label8" VerticalAlignment="Top" Width="120">Region: </Label>

</Grid>

Class code:

public partial class Window1 : Window

{

NORTHWNDEntities2 ce;

List<Customers> customersList;

int currentCustomerIndex = 0;

public Window1()

{

InitializeComponent();

}

private void Window_Loaded(object sender, RoutedEventArgs e)

{

ce = new NORTHWNDEntities2();

customersList = new List<Customers>();

IEnumerable<Customers> customerQuery = from ar in ce.Customers select ar;

customersList = customerQuery.ToList();

PopulateFields();

}

private void PopulateFields()

{

Customers currentCustomer = customersList[currentCustomerIndex];

if (currentCustomer != null)

{

CustomerIDLabel.Content = currentCustomer.CustomerID.ToString();

CompanyNamelabel.Content = currentCustomer.CompanyName;

ContactNamelabel.Content = currentCustomer.ContactName;

Countlabel.Content = customersList.Count.ToString();

ContactTitlelabel.Content = currentCustomer.ContactTitle;

Addresslabel.Content = currentCustomer.Address;

Citylabel.Content = currentCustomer.City;

Regionlabel.Content = currentCustomer.Region;

Countrylabel.Content = currentCustomer.Country;

}

else

{

CustomerIDLabel.Content = "N/A";

CompanyNamelabel.Content = "N/A";

ContactNamelabel.Content = "N/A";

Countlabel.Content = "0";

ContactTitlelabel.Content = "N/A";

Addresslabel.Content = "N/A";

Citylabel.Content = "N/A";

Regionlabel.Content = "N/A";

Countrylabel.Content = "N/A";

}

Output will look like this:

Figure7.

For more information download attached project, if you have any question and confusion drop me a mail or comment in C# corner comment section.

Up Next

Ebook Download

View all

An Introduction to R

Read by 947 people

Download Now!

Learn

View all