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   源码介绍

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asp.net文件上传。。ajax

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;
using System.Text;

namespace UploadDemo.project
{
    public partial class UploadWeb : System.Web.UI.Page
    {
        string filename = null;
        protected void Page_Load(object sender, EventArgs e)
        {
            try
            {
                HttpPostedFile postFile = Request.Files[0];
                filename = Request.QueryString["filename"].ToString();
                //开始上传
                string _savedFileResult = UpLoadFile(postFile, filename);
                Response.Write(_savedFileResult);

            }
            catch (Exception ex)
            {
                Response.Write("0|上传提交出错");
            }
        }

        public string UpLoadFile(HttpPostedFile str, string filename)
        {
            return UpLoadFile(str, "/Authorization/", filename);
        }
        public string UpLoadFile(HttpPostedFile httpFile, string toFilePath, string filename)
        {
            try
            {
                //获取要保存的文件信息
                //string filerealname = httpFile.FileName;
                string filerealname = filename;
                //获得文件扩展名
                string fileNameExt = System.IO.Path.GetExtension(filerealname);
                if (CheckFileExt(fileNameExt))
                {
                    //检查保存的路径 是否有/结尾
                    if (toFilePath.EndsWith("/") == false) toFilePath = toFilePath   "/";

                    //按日期归类保存
                    string datePath = "/";//DateTime.Now.ToString("yyyyMM")   "/"   DateTime.Now.ToString("dd")   "/";
                    if (true)
                    {
                        toFilePath  = datePath;
                    }

                    //物理完整路径                    
                    string toFileFullPath = System.Web.HttpContext.Current.Request.PhysicalApplicationPath   toFilePath;

                    //检查是否有该路径  没有就创建
                    if (!System.IO.Directory.Exists(toFileFullPath))
                    {
                        Directory.CreateDirectory(toFileFullPath);
                    }

                    //得到服务器文件保存路径
                    string toFile = Server.MapPath("~"   toFilePath);
                    string f_file = getName(filerealname);
                    //将文件保存至服务器
                    httpFile.SaveAs(toFile   f_file);
                    return "1|文件上传成功";
                }
                else
                {
                    return "0|文件不合法";
                }
            }
            catch (Exception e)
            {
                return "0|文件上传失败,错误原因："   e.Message;
            }
        }

        /// <summary>
        /// 获取文件名
        /// </summary>
        /// <param name="fileNamePath"></param>
        /// <returns></returns>
        private string getName(string fileNamePath)
        {
            string[] name = fileNamePath.Split('\\');
            return name[name.Length - 1];
        }
        /// <summary>
        /// 检查是否为合法的上传文件
        /// </summary>
        /// <param name="_fileExt"></param>
        /// <returns></returns>
        private bool CheckFileExt(string _fileExt)
        {
            string[] allowExt = new string[] { ".gif", ".jpg", ".jpeg", ".rar", ".png" };
            for (int i = 0; i < allowExt.Length; i  )
            {
                if (allowExt[i] == _fileExt) { return true; }
            }
            return false;

        }

        public static string GetFileName()
        {
            Random rd = new Random();
            StringBuilder serial = new StringBuilder();
            serial.Append(DateTime.Now.ToString("HHmmss"));
            serial.Append(rd.Next(100, 999).ToString());
            return serial.ToString();

        }


    }
}