App_Code/Tool/UpFile.cs

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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;
 
 
/// <summary>
/// UpFile 的摘要说明  
/// </summary>

public class UpFile : System.Web.UI.Page
{
    /// <summary>
    /// 上传附件
    /// </summary>
    /// <param name="FileUpload"></param>
    /// <param name="tableName"></param>
    /// <param name="Id"></param>
    /// <returns></returns>
    public static string SaveAnnex(System.Web.UI.WebControls.FileUpload FileUpload, string tableName, string Id)
    {

        if (((System.Web.UI.WebControls.FileUpload)FileUpload).HasFile)
        {
            //判断是否允许上传类型
            string FileExt = System.IO.Path.GetExtension(FileUpload.FileName);
            FileExt = FileExt.ToLower();
            if (FileExt.Length < 1)
            {
                return "";
            }
            string FileType = System.Configuration.ConfigurationManager.AppSettings["FileType1"];

            if (FileType.IndexOf(FileExt) == -1)
            {
               
                return FileUpload.PostedFile.FileName + "  该文件类型不支持上传！";
            }

            //判断文件大小是否可以上传
            string strFileSize = System.Configuration.ConfigurationManager.AppSettings["FileSize1"];
            int FileSize = FileUpload.PostedFile.ContentLength;
            if (FileSize > int.Parse(strFileSize))
            {
                
                return "文件太大，不允许上传！";
            }

            //计算出文件名 为时间的年月日时分秒+3位的随机数 
            Random rand = new Random();
            DateTime time = new DateTime();

            string filename = time.ToString("yyyyMMddHHmmss") + DateTime.Now.Millisecond.ToString() + rand.Next(999).ToString() + FileUpload.ID.Substring(4, 1);

            //上传文件