个人学习代码保存:例5.利用标准FileUpload单文件上传

前台代码：Default.aspx

<% @ Page Language = " C# "  AutoEventWireup = " true "   CodeFile = " Default.aspx.cs "  Inherits = " _Default "   %>

<! 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 > 无标题页 </ title >
</ head >
< body >
     < form id = " form1 "  runat = " server " >
     < div >
         < asp:FileUpload ID = " FileUpload1 "  runat = " server "   />
         < asp:Button ID = " Button1 "  runat = " server "  Text = " 上传 "  OnClick = " Button1_Click "   /></ div >
     </ form >
</ body >
</ html >

后台代码：Default.aspx.cs

using  System;
using  System.Data;
using  System.Configuration;
using  System.Web;
using  System.Web.Security;
using  System.Web.UI;
using  System.Web.UI.WebControls;
using  System.Web.UI.WebControls.WebParts;
using  System.Web.UI.HtmlControls;

public   partial   class  _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        if (FileUpload1.HasFile)
        {
            string FileName = FileUpload1.FileName;
            //取得文件类型
            string strFileExtend = FileName.Substring(FileName.LastIndexOf(".")+1);
            string[] NoFileExtend ={ "exe","php","asp"};
            bool Flag = true;
            for (int i = 0; i < NoFileExtend.Length; i++)
            {
                if (strFileExtend.Equals(NoFileExtend[i]))
                {
                    Flag = false;
                }
            }
            if (Flag)
            {
                string strFilePath = string.Format("files/{0}.{1}", DateTime.Now.ToString("mmhhddss"), strFileExtend);
                string path = Server.MapPath(strFilePath);
                FileUpload1.SaveAs(path);
                Page.ClientScript.RegisterStartupScript(this.GetType(), "Startup", "<script>alert('文件上传成功');</script>");
                Response.Write("格式化后的地址为："+strFilePath+"文件类型为："+strFileExtend);
            }
            else
            {

                Page.ClientScript.RegisterStartupScript(this.GetType(), "Startup", "<script>alert('" + string.Format("不能上传{0}格式文件", strFileExtend) + "');</script>");
            }
        }
        else
        {
            Page.ClientScript.RegisterStartupScript(this.GetType(),"Startup","<script>alert('文件不能为空');</script>");
        }
    }
}