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using System;
using System.Data;
using System.Configuration;
using System.Collections;
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 btnUpload_Click(object sender, EventArgs e)
    {
        Boolean fileOk = false;
        string path = Server.MapPath("~/upload/");
        //判断是否已经选取文件
        if (FileUpload1.HasFile)
        {
            //取得文件的扩展名,并转换成小写
            string fileExtension = System.IO.Path.GetExtension(FileUpload1.FileName).ToLower();
            //限定只能上传jpg和gif图片
            string[] allowExtension = { ".jpg", ".gif" };
            //对上传的文件的类型进行一个个匹对
            for (int i = 0; i < allowExtension.Length; i++)
            {
                if (fileExtension == allowExtension[i])
                {
                    fileOk = true;
                    break;
                }
            }
            //对上传文件的大小进行检测，限定文件最大不超过10M
            if (FileUpload1.PostedFile.ContentLength > 10240000)
            {
                fileOk = false;
            }
            //最后的结果
            if (fileOk)
            {
                try
                {
                    FileUpload1.PostedFile.SaveAs(path + FileUpload1.FileName);
                    Response.Write("<script type=‘text/javascript‘>window.alert(‘上传成功‘)</script>");
                }
                catch
                {
                    Response.Write("<script type=‘text/javascript‘>window.alert(‘上传失败‘)</script>");
                }
            }
            else
            {
                Response.Write("<script type=‘text/javascript‘>window.alert(‘文件类型或者文件大小超出10Ｍ‘)</script>");
            }

        }
    }
}