DataList做一个相册,并可以上传图片

1、前台代码

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="DataListPhotos_Page.aspx.cs" Inherits="DataSourceDemo.DataListPhotos_Page" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Photos</title>
     <style>
     .ShowPage-font
     { font-size:12px;
     	}
    </style>
</head>
<body>
    <form id="form1" runat="server">
   <div>
     <asp:DataList ID="DataList1" runat="server" CellPadding="4" CellSpacing="2" 
          GridLines="Both" RepeatColumns="3" RepeatDirection="Horizontal">  
      <ItemTemplate>  
         <div>  
         <a href='<%#"Photos/"+Eval("Name") %>' target="_blank" /><%--能够点击图片查看--%>  
         <asp:Image ID="Image1" runat="server" width="160" Height="98" ImageUrl='<%#"Photos/"+Eval("Name") %>' />  
         </div>  
      </ItemTemplate>  
    </asp:DataList> 
   <div class="ShowPage-font" >  
     <asp:Label ID="lblPageCount" runat="server"></asp:Label>
     第<asp:Label ID="lblCount" runat="server"></asp:Label>页       
     <asp:LinkButton ID="lbtnPreview" runat="server" Text="上一页" OnClick="lbtnPreview_Click" Font-Size="Small" ></asp:LinkButton>   
     <asp:LinkButton ID="lbtnNext" runat="server" Text="下一页" OnClick="lbtnNext_Click" Font-Size="Small" ></asp:LinkButton>   
     <asp:FileUpload ID="FileUpload1" runat="server" />
     <asp:Button ID="btnUploadFile" runat="server" Text="确定上传" Height="21px" onclick="btnUploadFile_Click" />        
   </div>        
   </div>
    </form>
</body>
</html>

2、后台代码

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.IO;

namespace DataSourceDemo
{
    public partial class DataListPhotos_Page : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                lblCount.Text = "1";
                BindPhotos();  

            }
        }
        private void BindPhotos()
        {      
            string ImagePath = Server.MapPath("~/Photos/");//图片路径 
            DirectoryInfo ImageFile = new DirectoryInfo(ImagePath);
            FileInfo[] FileArray = ImageFile.GetFiles("*.jpg"); //得到目录下的所有jpg图片 
            DataTable dtPhoto = new DataTable("Album");
            DataColumn colSmall = new DataColumn("Name");
            DataColumn colNormal = new DataColumn("Photo");
            dtPhoto.Columns.Add(colSmall);
            dtPhoto.Columns.Add(colNormal);           
            for (int i = 0; i < (FileArray.Length); i++)//将图片存入table中  
            {
                DataRow Row = dtPhoto.NewRow();
                Row["Name"] = FileArray[i].Name;
                Row["Photo"] = "./Photos/" + FileArray[i].Name;
                dtPhoto.Rows.Add(Row);
            }
            //分页 
            PagedDataSource Source = new PagedDataSource();
            Source.AllowPaging = true;
            Source.DataSource = dtPhoto.DefaultView;
            Source.PageSize = 9;
            int CurrentPage = Convert.ToInt32(lblCount.Text);
            Source.CurrentPageIndex = CurrentPage - 1;
            lbtnPreview.Enabled = true;
            lbtnNext.Enabled = true;
            if (CurrentPage == 1)
            {
                lbtnPreview.Enabled = false;
            }
            if (CurrentPage == Source.PageCount)
            {
                lbtnNext.Enabled = false;
            }
            lblPageCount.Text = "共" + Source.PageCount + "页/";
            DataList1.DataSource = Source;
            DataList1.DataBind();
        }
         
        protected void lbtnNext_Click(object sender, EventArgs e)//下一页 
        {
            lblCount.Text = Convert.ToString(Convert.ToInt32(lblCount.Text) + 1);
            BindPhotos();
        }

        protected void lbtnPreview_Click(object sender, EventArgs e)//上一页  
        {
            lblCount.Text = Convert.ToString(Convert.ToInt32(lblCount.Text) - 1);
            BindPhotos();
        }

        protected void btnUploadFile_Click(object sender, EventArgs e)//图片上传
        {
            string FilePath = Server.MapPath("~/Photos/");
            HttpFileCollection UploadFile = Request.Files;
            if (FileUpload1.HasFile)//表示控件是否包含文件
            {
                for (int i = 0; i < UploadFile.Count; i++)
                {
                    HttpPostedFile postFile = UploadFile[i];
                    try
                    {
                        if (postFile.ContentLength > 0)
                        {
                            string FileName = postFile.FileName;
                            string SingleName = FileName.Substring(FileName.LastIndexOf(@"") + 1);
                            postFile.SaveAs(FilePath + SingleName);
                        }
                    }
                    catch (Exception ex)
                    {
                        Assistant.AlertMessage(ex.Message, this);//Assistant是自定义的类，用于弹出窗口信息                      
                    }
                }
                Response.Redirect("~/DataListPhotos_Page.aspx");
            }
            else
            {
                Assistant.AlertMessage("请输入要上传的文件", this);
            }
        }
       
    }
}

3、Assistant类

 public class Assistant
    {
        public static void AlertMessage(string msg, Page page)
        {
            page.ClientScript.RegisterStartupScript(page.GetType(), "", "<script language='javascript'>alert('" + msg + "');</script>");
        }

    }

4、效果预览