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DataContex in WPF Using the C# and XAML

Posted by Neha Articles | WPF June 26, 2013
In this article I am going to explain DataContext in WPF . The DataContext property in WPF is default source of binding because it is automatically inherited by all children of the element where it is assigned.
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Introduction 

This article explains the DataContext property in WPF. The DataContext property in WPF is the default binding source because it is automatically inherited by all children of the element where it is assigned. 

Hence we don't need to specify the source of the data like using the Source property in the Binding, inheriting a DataContext from its nearest element or setting the ElementName and other relative properties in the binding object. In this article we bind many of the windows properties such as the Title, width and height. Since the window contains a DataContext we don't need to define a source of each binding. 

How DataContext is used

The DataContext property sets the basis of all binding down through the hierarchy of controls .This saves you from the problem of manually defining the source of each binding, hence it saves time. Rather than defining the source multiple times for binding. It also improves object oriented code readability.
Let's try illustrating it with a simple example.

Step 1
 

First we create a WPF application using the following procedure:
  • Open Visual Studio.
  • Select the C# language and "WPF Application".
  • Name the project "DataContext".
  • Click on the "OK" button.
first.jpg

Step 2
  • Now go to the MainWindow.xaml.
  • Delete the Grid tag.
  • Write the following code in MainWindow.xaml:

<Window x:Class="WpfApplication14.MainWindow"

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

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

        Title="MainWindow" Height="350" Width="525">

    <StackPanel Margin="15" Width="452" Background="#FFDED022">

        <WrapPanel>

            <Label Content ="Window Title:  " />

            <TextBox Text="{Binding Title, UpdateSourceTrigger=PropertyChanged}" Width="200" />

        </WrapPanel>

        <WrapPanel Margin="0,10,0,0">

            <Label Content="Window Dimensions: " />

            <TextBox Text="{Binding Width}" Width="100" />

            <Label Content =" x " />

            <TextBox Text="{Binding Height}" Width="100" />

        </WrapPanel>

    </StackPanel>

</Window>

  • Corresponding to the code above the window looks as:
123.jpg

Step 3
  • Now go to the MainWindow.xaml.cs.
  • Write the following code:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;

namespace WpfApplication14

{

    /// <summary>

    /// Interaction logic for MainWindow.xaml

    /// </summary>

    public partial class MainWindow : Window

    {

      

  

     public MainWindow()

                {

                        InitializeComponent();

                        this.DataContext = this;

                }

        }

}

Output 

Press F5.

 Clipboard02.jpg
 

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