Select Data Using LINQ to SQL Class in WPF

Introduction

This article shows how to select data using LINQ to SQL in WPF applications.

Create a WPF application as in Figure 1.


Figure 1: Create WPF application

Add LINQ to SQL classes to the project as in Figures 2 and 3.

 
Figure 2: Add LINQ to SQL

 
Figure 3: Choose database objects

MainWindow.xaml

  1. <Window x:Class="SelectData_WPF_LINQtoSQL.MainWindow"  
  2.         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
  3.         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
  4.         Title="MainWindow"  
  5.         Width="525"  
  6.         Height="350"  
  7.         Loaded="Window_Loaded">  
  8.     <Grid>  
  9.         <DataGrid x:Name="dgEmployee"  
  10.                   Width="267"  
  11.                   Margin="118,47,0,0"  
  12.                   HorizontalAlignment="Left"  
  13.                   VerticalAlignment="Top"  
  14.                   AutoGenerateColumns="False"  
  15.                   CanUserAddRows="False"  
  16.                   ColumnWidth="*">  
  17.             <DataGrid.Columns>  
  18.                 <DataGridTextColumn x:Name="dgrEmpId"  
  19.                                     Binding="{Binding EmpId}"  
  20.                                     Header="EmpId"  
  21.                                     IsReadOnly="True" />  
  22.                 <DataGridTextColumn x:Name="dgrFirstName"  
  23.                                     Binding="{Binding FirstName}"  
  24.                                     Header="FirstName"  
  25.                                     IsReadOnly="True" />  
  26.                 <DataGridTextColumn x:Name="dgrLastName"  
  27.                                     Binding="{Binding LastName}"  
  28.                                     Header="LastName"  
  29.                                     IsReadOnly="True" />  
  30.             </DataGrid.Columns>  
  31.         </DataGrid>  
  32.     </Grid>  
  33. </Window>  

MainWindow.xaml.cs

  1. using System;  
  2. using System.Collections.Generic;  
  3. using System.Linq;  
  4. using System.Text;  
  5. using System.Threading.Tasks;  
  6. using System.Windows;  
  7. using System.Windows.Controls;  
  8. using System.Windows.Data;  
  9. using System.Windows.Documents;  
  10. using System.Windows.Input;  
  11. using System.Windows.Media;  
  12. using System.Windows.Media.Imaging;  
  13. using System.Windows.Navigation;  
  14. using System.Windows.Shapes;  
  15.   
  16. namespace SelectData_WPF_LINQtoSQL  
  17. {  
  18.     /// <summary>  
  19.     /// Interaction logic for MainWindow.xaml  
  20.     /// </summary>  
  21.     public partial class MainWindow : Window  
  22.     {  
  23.         public MainWindow()  
  24.         {  
  25.             InitializeComponent();  
  26.         }  
  27.   
  28.         private void Window_Loaded(object sender, RoutedEventArgs e)  
  29.         {  
  30.             dgEmployee.ItemsSource = objContext.Employees.ToList();  
  31.         }  
  32.   
  33.         DataClasses1DataContext objContext = new DataClasses1DataContext();  
  34.     }  
  35. }  

The output of the application is as in Figure 4.

 
Figure 4: Output of the application

Summary

In this article we saw how to select data using LINQ to SQL in WPF applications.



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