queryphoto.aspx.cs

这个是网上相册系统的一个架构设计说明

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

using Utils;
using Model;

namespace AlbumOL
{
	/// <summary>
	/// QueryPhoto 的摘要说明。
	/// </summary>
	public class QueryPhoto : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.TextBox tbPhotoName;
		protected System.Web.UI.WebControls.Label lbAlias;
		protected System.Web.UI.WebControls.Panel pWelcome;
		protected System.Web.UI.WebControls.Panel panResult;
		protected System.Web.UI.WebControls.DataList dlPhoto;
		protected System.Web.UI.WebControls.Button btnQuery;
		protected System.Web.UI.WebControls.TextBox tbKw;
		protected System.Web.UI.WebControls.Panel panCondition;
		protected System.Web.UI.WebControls.DropDownList ddlCat;
		protected System.Web.UI.WebControls.Label lbNoResult;
		protected System.Web.UI.WebControls.Panel p1;
	
		private void Page_Load(object sender, System.EventArgs e)
		{
			WebUtils.CheckUser();
			lbAlias.Text = (User as MyPrincipal).Name;
		}

		#region Web 窗体设计器生成的代码
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{    
			this.btnQuery.Click += new System.EventHandler(this.btnQuery_Click);
			this.Load += new System.EventHandler(this.Page_Load);
			this.PreRender += new System.EventHandler(this.QueryPhoto_PreRender);

		}
		#endregion

		private void btnQuery_Click(object sender, System.EventArgs e)
		{
		}

		private void QueryPhoto_PreRender(object sender, System.EventArgs e)
		{
			int idCat = 0;
			if(ddlCat.SelectedIndex>=0)
				idCat = Int32.Parse(ddlCat.SelectedValue);
			MyPrincipal prcpl = this.User as MyPrincipal;
			Hashtable queryParam = new Hashtable();
			queryParam.Add("OwnerID", prcpl.UserID);
			IModel model = new CategoryModel();
			DataTable dtCat = model.Query(queryParam);
			DataRow row = dtCat.NewRow();
			row["CategoryID"] = -1;
			row["CategoryName"] = "<全部>";
			row["Owner"] = prcpl.UserID;
			dtCat.Rows.Add(row);
			DataView dv = new DataView(dtCat, "", "CategoryID", DataViewRowState.CurrentRows);
			ddlCat.DataSource = dv;
			ddlCat.DataBind();
			if(!this.IsPostBack)return;

			
			string photoName = this.tbPhotoName.Text.Trim();
			string key = this.tbKw.Text.Trim();
			queryParam.Clear();
			if(idCat>0)queryParam.Add("Category", idCat);
			if(photoName.Length>0)queryParam.Add("PhotoName", photoName);
			if(key.Length>0)queryParam.Add("Keyword", key);

			PhotoModel modelPhoto = new PhotoModel();
			DataTable dt = modelPhoto.Query(queryParam);
			panResult.Visible = true;
			if(dt.Rows.Count <= 0)
			{
				lbNoResult.Visible = true;
				dlPhoto.Visible = false;
			}
			else
			{
				lbNoResult.Visible = false;
				dlPhoto.Visible = true;
				dlPhoto.DataSource = dt;
			}
			DataBind();
		}

	}
}