Auto Complete In DataGrid Cell Editing In Silverlight 3 Application


Introduction

In this article we will see how we can implement AutoComplete feature in a cell editing in DataGrid.

Crating Silverlight Project

Fire up Visual Studio 2008 and create a Silverlight Application. Name it as AutoComlpeteDataGridInSL3.

Go ahead and add a DataGrid to your application.

Now add a Class to define properties for sample data.

public
class
Users: INotifyPropertyChanged

{

#region INotifyPropertyChanged Members


public
event
PropertyChangedEventHandler PropertyChanged;

#endregion

 

#region UserName


private
string _UserName;


public
string UserName

{


get { return _UserName; }


set

{


if (value.Length < 4)

{


throw
new
ValidationException(“User Name should contain atleast 4 chars”);

}

_UserName = value;

RaisePropertyChanged(“UserName”);

}

}

#endregion

 

#region Age


private
int _Age;


public
int Age

{


get { return _Age; }


set

{

_Age = value;

}

}

#endregion

 

#region Gender


private
string _Gender;


public
string Gender

{


get { return _Gender; }


set

{

_Gender = value;

}

}

#endregion

 

#region Country


private
string _Country;


public
string Country

{


get { return _Country; }


set

{

_Country = value;

}

}

#endregion

 

 

 


private
void RaisePropertyChanged(string propertyName)

{


if (this.PropertyChanged != null)

{


this.PropertyChanged(this, new
PropertyChangedEventArgs(propertyName));

}

}

}

Now add some sample data to a List and assign the list to the ItemSource of the DataGrid.

public MainPage()

{

InitializeComponent();


List<Users> myList = new
List<Users>

{


new
Users{ UserName=“Hiro Nakamura”, Age=24, Gender=“M”, Country=“Japan”},


new
Users{ UserName=“Mohinder Suresh”, Age=26, Gender=“M”, Country=“India”},


new
Users{ UserName=“Claire Bennette”, Age=20, Gender=“F”, Country=“USA”},


new
Users{ UserName=“Matt Parkman”, Age=30, Gender=“M”, Country=“USA”},


new
Users{ UserName=“Nathan Patrelli”, Age=30, Gender=“M”, Country=“USA”},


new
Users{ UserName=“Peter Patrelli”, Age=26, Gender=“M”, Country=“USA”},


new
Users{ UserName=“Mica Sanders”, Age=19, Gender=“M”, Country=“USA”},


new
Users{ UserName=“Linderman”, Age=56, Gender=“M”, Country=“USA”},


new
Users{ UserName=“Ando”, Age=24, Gender=“M”, Country=“Japan”},


new
Users{ UserName=“Maya”, Age=24, Gender=“F”, Country=“Mexico”},


new
Users{ UserName=“Angela Patrelli”, Age=26, Gender=“F”, Country=“USA”},


new
Users{ UserName=“Niki Sanders”, Age=26, Gender=“F”, Country=“USA”},

};

 

MyDataGrid.ItemsSource = myList;

}

Now that you have added some sample data, you can test your application.

Now we don’t need to have AutoGenerateColumns of the DataGrid as we are going to define our own.

Follow the xaml code behind for a template:

<data:DataGrid x:Name=”MyDataGrid” Margin=”0″ Grid.Row=”1″ Grid.Column=”1″ IsReadOnly=”False” AutoGenerateColumns=”False”>


<data:DataGrid.Columns>


<data:DataGridTextColumn Binding=”{Binding Age}” Header=”Age” />

 


<data:DataGridTemplateColumn Header=”User Name”>


<data:DataGridTemplateColumn.CellTemplate>


<DataTemplate>


<TextBlock Text=”{Binding UserName}” Margin=”4″ />


</DataTemplate>


</data:DataGridTemplateColumn.CellTemplate>


<data:DataGridTemplateColumn.CellEditingTemplate>


<DataTemplate>


<input:AutoCompleteBox


HorizontalAlignment=”Left”


Width=”180″


IsTabStop=”True”


Text=”{Binding UserName, Mode=TwoWay}”


ItemsSource=”{StaticResource SampleHeroes}”


/>


</DataTemplate>


</data:DataGridTemplateColumn.CellEditingTemplate>


</data:DataGridTemplateColumn>


<data:DataGridTextColumn Binding=”{Binding Gender}” Header=”Gender” />


<data:DataGridTextColumn Binding=”{Binding Country}” Header=”Country” />


</data:DataGrid.Columns>

 


</data:DataGrid>

As you can see from the above xaml code the columns are bound to respective properties. For UserName we have a CellEditingTemplate, where we have used an AutoCompleteBox.

Now create a class named ObjectCollection and define the two constructors as follows:

public
class
ObjectCollection: Collection<object>

{


public ObjectCollection()

{

}

 


public ObjectCollection(IEnumerable collection)

{


foreach (object obj in collection)

{

Add(obj);

}

}

 

}

Add a sample ObjectCollection in xaml code behind.

<UserControl.Resources>


<local:ObjectCollection x:Key=”SampleHeroes”>


<sys:String>Jack Sephered</sys:String>


<sys:String>James Soyer</sys:String>


<sys:String>John Lock</sys:String>


<sys:String>Jacky Chan</sys:String>


</local:ObjectCollection>


</UserControl.Resources>

That’s it we are done with this. Run your application.

Edit the User Name Column of any row and start typing with the letter “J” (as we have only fields starting with J).

You will be prompted with the List of values from the AutoCompleteBox:

Enjoy Coding.

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