defaultcs.aspx.cs

Telerik是很大的第三方软件制造商

using System;
using System.Data;
using System.IO;
using Telerik.QuickStart;
using Telerik.WebControls;

namespace Telerik.ComboboxExamplesCS.ClientEvents
{
	/// <summary>
	/// Summary description for _Default.
	/// </summary>
	public class DefaultCS: XhtmlPage
	{
		protected RadComboBox RadComboBox1;				
		DataTable dictionaryWords = new DataTable();		

		private void LoadData()
		{			
			string tdfPath = Server.MapPath("~/Combobox/Data/en-US.tdf");

			if (Cache["dictionaryWords"] == null)
			{
				DataTable words = new DataTable("words");
				DataColumn column = words.Columns.Add("word");			

				string word = String.Empty;
				StreamReader sr = File.OpenText(tdfPath);

				word = sr.ReadLine();
				while (word != null)
				{
					string tempWord = word.Trim().Split(':')[0];
					words.Rows.Add(new string [] { tempWord });
					word = sr.ReadLine();
				}

				sr.Close();
				Cache["dictionaryWords"] = words;
			}

			dictionaryWords = (DataTable) Cache["dictionaryWords"];			
		}

		private void RadComboBox1_ItemsRequested(object o, RadComboBoxItemsRequestedEventArgs e)
		{
			LoadData();
			RadComboBox1.Items.Clear();
	
			string text = e.Text;
			DataRow [] rows = dictionaryWords.Select("word LIKE '" + text + "*'");			
			
			int itemsPerRequest = 20;
			int itemOffset = e.NumberOfItems;
			int endOffset = itemOffset + itemsPerRequest;
			if (endOffset > rows.Length)
			{
				endOffset = rows.Length;
			}
			
			for (int i=itemOffset; i<endOffset; i++)
			{				
				RadComboBox1.Items.Add(new RadComboBoxItem(rows[i]["word"].ToString()));
			}

			e.Message = String.Format("Items <b>1</b>-<b>{0}</b> out of <b>{1}</b>", endOffset.ToString(), rows.Length.ToString());
		}

		
		private void Page_Load(object sender, EventArgs e)
		{
			if (!Page.IsPostBack)
			{
				LoadData();
			}
		}		

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: This call is required by the ASP.NET Web Form Designer.
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		///		Required method for Designer support - do not modify
		///		the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{	
			this.RadComboBox1.ItemsRequested += new RadComboBoxItemsRequestedEventHandler(this.RadComboBox1_ItemsRequested);
			this.Load += new EventHandler(this.Page_Load);

		}
		#endregion

	}
}