Sunday, May 20, 2012

WPF - TreeView Databinding in WPF

In this article i will show how to data bind in TreeView Control In WPF.


Step 1
Download Northwind database from the following link.
http://www.microsoft.com/downloads/details.aspx?FamilyID=06616212-0356-46a0-8da2-eebc53a68034&displaylang=en



Step 2
Attach a Northwind database into MS-SQL server.


Step 3
Create a WPF Application and give the solution name as SolWPFTreeView.


Step 4
Now we have to define Parent and child relationship between Categories and Products Tables from Northwind database by using DataRelation Class,create Northwind Static Class,it is look like this



using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SqlClient;

namespace SolWPFTreeView
{
    public static class Northwind
    {
        #region 

        /// <summary>
        /// Data Relation Between Two Tables Such as Categories and Products
        /// </summary>
        /// <returns>DataSet</returns>
        public static DataSet CreateDataRelation()
        {
            try
            {
                SqlConnection SqlCon = new SqlConnection();
                SqlCon.ConnectionString = @"Data Source=SHREE_DESKTOP\SHREE;Initial Catalog=Northwind;Integrated Security=True";
                SqlCon.Open();

                SqlDataAdapter SqlCategoryDa = new SqlDataAdapter("SELECT CategoryID,CategoryName FROM Categories", SqlCon);

                SqlDataAdapter SqlProductDa = new SqlDataAdapter("SELECT CategoryID,ProductID,ProductName,UnitPrice FROM Products", SqlCon);

                DataSet Ds = new DataSet();
                SqlCategoryDa.Fill(Ds, "Categories");
                SqlProductDa.Fill(Ds, "Products");


                DataRelation Dr = new DataRelation("DataRelationShip",
                    Ds.Tables["Categories"].Columns["CategoryID"],
                    Ds.Tables["Products"].Columns["CategoryID"],
                    true
                    );
                Dr.Nested = true;

                Ds.Relations.Add(Dr);

                return Ds;
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }

        #endregion
    }
}

Step 5
Add a Treeview control in window,it is look like this
<Grid>

        <TreeView x:Name="ProductTreeView" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch">
            <TreeView.Background>
                <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                    <GradientStop Color="#FF062F3B" Offset="0" />
                    <GradientStop Color="#FF77A7BE" Offset="1" />
                </LinearGradientBrush>
            </TreeView.Background>
        </TreeView>
    </Grid>

Step 6
Create a Templates for Nodes,For displaying data in nodes first we have to create a DataTemplate for Product later we have to create HierarchicalDataTemplate for Categories  and then we can add it to this template and bind accordingly. Remember to provide a unique Key for the template. Then we can use this key for referring it in ItemTemplate of the HierarchicalDataTemplate,it is look like this
<Window.Resources>
  <DataTemplate x:Key="ProductDataTemplate">

            <Border BorderThickness="2" CornerRadius="10" Background="Gray" Width="310">
   
   <Grid Width="300" Height="20">
    <Grid.ColumnDefinitions>
     <ColumnDefinition Width="0.771*"/>
     <ColumnDefinition Width="0.229*"/>
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
     <RowDefinition Height="0.5*"/>
    </Grid.RowDefinitions>
    
    <TextBlock Grid.Row="0" Grid.Column="0"  Text="{Binding ProductName}" Margin="10,0" Foreground="WhiteSmoke"></TextBlock>
                <TextBlock Grid.Row="0" Grid.Column="1" Text="{Binding UnitPrice}" Margin="10,0" Foreground="WhiteSmoke"></TextBlock>
    
   </Grid>
   </Border>
  </DataTemplate>
  
  
  <HierarchicalDataTemplate x:Key="CategoryDataTemplate" 
       ItemsSource="{Binding DataRelationShip}" 
       ItemTemplate="{StaticResource ProductDataTemplate}">
   <Border BorderThickness="2" CornerRadius="10" Background="Orange" Width="340">
    <Grid Height="20">
     <TextBlock Text="{Binding CategoryName}" Margin="10,0" HorizontalAlignment="Stretch" VerticalAlignment="Center"></TextBlock>
    </Grid>
   </Border>
   
  </HierarchicalDataTemplate>
  
  
 </Window.Resources>


Step 7
Apply ItemTemplate on treeview control,in ItemSource we need specify parent table name  in our case it is Categories Table.it is look like this
<Grid>

        <TreeView x:Name="ProductTreeView"   ItemsSource="{Binding Categories}" ItemTemplate="{DynamicResource CategoryDataTemplate}" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch">
            <TreeView.Background>
                <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                    <GradientStop Color="#FF062F3B" Offset="0" />
                    <GradientStop Color="#FF77A7BE" Offset="1" />
                </LinearGradientBrush>
            </TreeView.Background>
        </TreeView>
    </Grid>

Step 8
Bind the data in TreeView Control in Code Behind,it is look like this
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 SolWPFTreeView
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            try
            {
                // Bind The RelationShip Data
                this.ProductTreeView.DataContext = Northwind.CreateDataRelation();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message); 
            }
        }
    }
}

Run the Project.


Output




Click on Image for better View




Click on Image for better View


Full XAML Code
<Window x:Class="SolWPFTreeView.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">
 <Window.Resources>
  <DataTemplate x:Key="ProductDataTemplate">

            <Border BorderThickness="2" CornerRadius="10" Background="Gray" Width="310">
   
   <Grid Width="300" Height="20">
    <Grid.ColumnDefinitions>
     <ColumnDefinition Width="0.771*"/>
     <ColumnDefinition Width="0.229*"/>
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
     <RowDefinition Height="0.5*"/>
    </Grid.RowDefinitions>
    
    <TextBlock Grid.Row="0" Grid.Column="0"  Text="{Binding ProductName}" Margin="10,0" Foreground="WhiteSmoke"></TextBlock>
                <TextBlock Grid.Row="0" Grid.Column="1" Text="{Binding UnitPrice}" Margin="10,0" Foreground="WhiteSmoke"></TextBlock>
    
   </Grid>
   </Border>
  </DataTemplate>
  
  
  <HierarchicalDataTemplate x:Key="CategoryDataTemplate" 
       ItemsSource="{Binding DataRelationShip}" 
       ItemTemplate="{StaticResource ProductDataTemplate}">
   <Border BorderThickness="2" CornerRadius="10" Background="Orange" Width="340">
    <Grid Height="20">
     <TextBlock Text="{Binding CategoryName}" Margin="10,0" HorizontalAlignment="Stretch" VerticalAlignment="Center"></TextBlock>
    </Grid>
   </Border>
   
  </HierarchicalDataTemplate>
  
  
 </Window.Resources>
 <Grid>

        <TreeView x:Name="ProductTreeView"   ItemsSource="{Binding Categories}" ItemTemplate="{DynamicResource CategoryDataTemplate}" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch">
            <TreeView.Background>
                <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                    <GradientStop Color="#FF062F3B" Offset="0" />
                    <GradientStop Color="#FF77A7BE" Offset="1" />
                </LinearGradientBrush>
            </TreeView.Background>
        </TreeView>
    </Grid>
</Window>

Download
Download Source Code

7 comments:

  1. Thank you. This article helped me a lot. Can you Kindly provide article for treeview with checkbox

    ReplyDelete
    Replies
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  2. How to add more levels to this tree view.

    ReplyDelete
    Replies
    1. Hi, Great.. Tutorial is just awesome..It is really helpful for a newbie like me.. I am a regular follower of your blog. Really very informative post you shared here. Kindly keep blogging. If anyone wants to become a .Net developer learn from Dot Net Training in Chennai. or learn thru Dot Net Training in Chennai. Nowadays Dot Net has tons of job opportunities on various vertical industry.
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  3. If I add new Category to database, how to auto refresh.

    ReplyDelete
  4. Hi.. Kishor....
    Your all step step codes are very helpful to understand.
    Kindly provide how to add more levels in treeview in above example.

    ReplyDelete