一、Aspx页面：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="FileUploadDemo.aspx.cs" Inherits="WebApplication1.FileUploadDemo" %>                
     
    
      
        
       
        
                
                      
                     
                         
                                    
       
    
      
    
     

二、Aspx后台代码：

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using System.IO;namespace WebApplication1{    public partial class FileUploadDemo : System.Web.UI.Page    {        protected void Page_Load(object sender, EventArgs e)        {        }        protected void btnOk_Click(object sender, EventArgs e)        {            if (this.fileUpload.HasFile)            {                string fileName = this.fileUpload.PostedFile.FileName;                  // 客户端文件路径                string extension = System.IO.Path.GetExtension(fileName);                if (extension.ToLower() != ".jpg" && extension.ToLower() != ".png")                {                    ScriptManager.RegisterStartupScript(this, this.GetType(), "msg", "alert('只允许jpg 和 png！');", true);                    return;                }                string pathBase = "D:\\UploadFile";                if (!Directory.Exists(pathBase))                    Directory.CreateDirectory(pathBase);                string webFilePath = Path.Combine(pathBase, fileName); // 数据库保存文件路径（相对全路径）                this.fileUpload.SaveAs(webFilePath);  // 使用 SaveAs 方法保存文件                ScriptManager.RegisterStartupScript(this, this.GetType(), "msg", "alert('上傳成功，我們會盡快進行核對！');", true);            }        }    }}