Databases Reference
In-Depth Information
You can use any of the built-in or third-party ASP.NET controls to implement user inter -
face appropriate for entering search values for a data type the template is designed to
handle. This template is designed for
String
columns. It uses a
TextBox
control similar to
the one used in the sample search page earlier. The
OnTextChanged
event handler is used
to refresh the query results when the user changes the search value.
LISTING 5.4
Text F ilter Template (Code-Behind)
using System;
using System.Linq;
using System.Linq.Dynamic;
using System.Web.DynamicData;
using System.Web.UI;
namespace WebApplication.DynamicData.Filters
{
public partial class TextFilter :
QueryableFilterUserControl
{
public override IQueryable GetQueryable(IQueryable query)
{
if (!string.IsNullOrEmpty(this.textBox.Text))
{
string filter = this.Column.Name + “ == @0”;
query = query.Where (filter, this.textBox.Text);
}
return query;
}
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
this.textBox.MaxLength = this.Column.MaxLength;
this.textBox.Text =
this.DefaultValue;
}
protected void TextBox_TextChanged(object sender, EventArgs e)
{
this.OnFilterChanged();
}
}
}
