App_Code/upload.cs

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using System;
using System.IO;
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;
/// <summary>
/// upload 的摘要说明
/// </summary>
public class upload
{
    public upload()
    {
        //
        // TODO: 在此处添加构造函数逻辑
        //
    } public string[] Resup ={ "上传失败或指定的文件不存在", "图片大于1000K，重新传图片！", "格式不对，限制上传（只允许gif/jpg格式文件）！", "上传成功！" };
    public string s = string.Empty;

    public string Up(System.Web.UI.HtmlControls.HtmlInputFile File2, string Pa)
    {
        //
        // TODO: 在此处添加构造函数逻辑
        //

        if (File2.PostedFile.ContentLength.ToString() == "0")
        {
            return "0";
        }
        else
        {
            //获取文件名称
            string ss;
            ss = System.DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + Path.GetExtension(File2.PostedFile.FileName);
          
                    File2.PostedFile.SaveAs(System.Web.HttpContext.Current.Server.MapPath(Pa) + ss);
                    s = "Uploads/" + ss;
                    return "3";
                    //Up= ss;
             
            
        }

    }
}