几种文件上传的方法 第一种（务器控件）：1.Default.aspx代码如下：        
     
    
      
    
           
           
      
    
     
2.Default.aspx.cs代码如下：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;public partial class Default2 : System.Web.UI.Page{    protected void Page_Load(object sender, EventArgs e)    {        if (!IsPostBack)        {            HttpFileCollection files = HttpContext.Current.Request.Files;            HttpPostedFile file = files["oneFile"];            string FileName = System.IO.Path.GetFileName(file.FileName);            string serverpath = "D:/Admin/Image/" + DateTime.Now.ToString("yyMMddhhmmss") + FileName;            string strExping = FileName.Substring(FileName.LastIndexOf("."));            if (strExping.Equals(".jpg"))            {                file.SaveAs(serverpath);                Response.Write("成功");            }            else            {                Response.Write("失败");            }        }    }}第二种(非服务器控件)：1.Default.aspx代码如下：        
     
    
      
    
           
           
      
    
     
2.Default.aspx.cs代码如下：     public void FileUpload()    {        HttpFileCollection files = HttpContext.Current.Request.Files;        HttpPostedFile postedFile = files["oneFile"];        if (postedFile.ContentLength > 3072000)            Response.Write("文件大小不能大于300K！");        string fileName, fileExtension;        fileName = System.IO.Path.GetFileName(postedFile.FileName);        string SaveFilePath = "";        if (fileName != "")        {            //SaveFilePath = "/UploadFile/" + System.DateTime.Now.ToString("yyyymmddhhmmss") + ".rar";            SaveFilePath = System.DateTime.Now.ToString("yyyymmddhhmmss") + ".rar";            fileExtension = System.IO.Path.GetExtension(fileName).ToLower();            if (fileExtension != ".rar")                Response.Write("文件格式不正确，你只能上传WinRar压缩包格式文件！");            postedFile.SaveAs(System.Web.HttpContext.Current.Request.MapPath("UploadFile/") + SaveFilePath);            //postedFile.SaveAs(Server.MapPath(SaveFilePath));        }    }第三种（服务器控件）：（Default.aspx代码如下：跟第一种第二种的都差不多，就不写了）1.Default.aspx.cs代码如下：   protected void Button1_Click(object sender, EventArgs e)    {        if (FileUpload1.HasFile)        {            FileUpload1.SaveAs (Server.MapPath ( "~/Upload/" +FileUpload1.FileName));            Label1.Text="恭喜你，上传成功!";        }        else        {            Label1.Text = "上传失败，或没指定正确的文件!";        }    }第四种（服务器控件控制上传文件大小,类型 ）：1、Default.aspx代码如下：<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>        
     
    
      
        
               
       
       
        上传文件名：
       
       
        上传文件大小：
       
       
        上传文件路径及名：
       
       
               
       
       
       
      
    
     
2、Default.aspx.cs代码如下：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)        {            Label2.Text = FileUpload1.FileName;            Label3.Text = FileUpload1.PostedFile.ContentLength.ToString() + "字节";            Label4.Text = FileUpload1.PostedFile.FileName;            //获得扩展名            string extension = System.IO.Path.GetExtension(FileUpload1.FileName);            if (extension == ".rar" || extension == ".doc" || extension == ".xls")            {                if (FileUpload1.PostedFile.ContentLength < 10000000)//文件小于10M                {                    FileUpload1.SaveAs(Server.MapPath("~/upLoad/" + FileUpload1.FileName));                    Label1.Text = "恭喜你，上传成功!";                }                else                {                    Label1.Text = "上传失败，不是管理员，上传文件不能大于10M！";                }            }            else                Label1.Text = "上传失败，只能上传扩展名是rar、doc、xls的文件！";        }        else        {            Label1.Text = "上传失败，或没指定正确的文件!";        }    }}

4：多个文件一起上传的方法：