<input id="File_Audio" type="file" /> 一步到位上传图片、音频等文件

首先我们需要建一个上传文件的类UploadFile.cs

 

using System;
using System.Data;
using System.Data.SqlClient;
using System.Web;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.IO;


namespace SMS.Web
{
    /****************************************************************** 
** 文件名:UploadFile.cs
** 创建人:sundy zhangzhao
** 日 期: 2008-4-25
** 修改人: 
** 日 期: 
** 描 述: 上传文件公共类
** 版 本: 1.0
**----------------------------------------------------------------
******************************************************************/


    /// <summary>
    /// 用于上传文件
    /// </summary>
    public class UploadFile
    {
        #region 初始化

        protected HtmlInputFile upFile;
        protected string upNewFileName = "";
        public string upNewFilePath = "";

        #endregion

        #region 方法

        /// <summary>
        /// 初始化文件
        /// </summary>
        public UploadFile(HtmlInputFile agFile)
        {
            upFile = agFile;
        }

        /// <summary>
        /// 保存文件
        /// </summary>
        public void saveFile(string filepath)
        {
            try
            {
                upNewFileName = GetTimestr() + GetExpName(".");
                upNewFilePath = filepath + "\\" + upNewFileName.ToLower();
                upFile.PostedFile.SaveAs(upNewFilePath);
            }
            catch (System.Exception Ex)
            {
                throw Ex;
            }
        }

        /// <summary>
        /// 返回当前时间的字符串
        /// </summary>
        public string GetTimestr()
        {
            string strTime = DateTime.Now.ToString("yyyyMMddHHmmss");
            strTime = strTime + Get_Str_Num(3);
            return strTime;
        }

        /// <summary>
        /// 判断是否具有提交的文件
        /// </summary>
        public bool CheckFileContent()
        {
            if (upFile.PostedFile.ContentLength == 0)
                return false;
            else
                return true;
        }

        /// <summary>
        /// 校验上传文件的文件名
        /// </summary>
        /// <param name="checkstr">输入字符分割的特征值</param>
        public string GetExpName(string checkstr)
        {
            string upFileName = upFile.PostedFile.FileName.ToLower();
            int pos = upFileName.LastIndexOf(checkstr);
            string s = upFileName.Substring(pos);
            if (s.ToLower() == ".jpg")//jpg 改成jpeg 后缀名
            {
                s = ".jpeg";
            }
            return s;
        }

        /// <summary>
        /// 获得上传文件的大小
        /// </summary>
        public int getUpFileSize()
        {
            return upFile.PostedFile.ContentLength;
        }

        /// <summary>
        /// 获得上传文件的文件名
        /// </summary>
        public string getNewFileName()
        {
            return upNewFileName.ToLower();
        }

        /// <summary>
        /// 删除该文件
        /// </summary>
        public void delFile(string FileName)
        {
            if (File.Exists(FileName))
            {
                File.Delete(FileName);
            }
        }

        #endregion

        #region  获取随机数的方法
        public string Get_Str_Num(int strnum)
        {
            string BmpStr = "";
            string passchars = "0123456789";
            int iRandNum;
            Random random = new Random(GetRandomSeed());
            for (int i = 0; i < strnum; i++)
            {
                iRandNum = random.Next(passchars.Length);
                BmpStr += passchars[iRandNum];
            }
            return BmpStr;
        }
        public int GetRandomSeed()
        {
            byte[] bytes = new byte[4];
            System.Security.Cryptography.RNGCryptoServiceProvider rng = new System.Security.Cryptography.RNGCryptoServiceProvider();
            rng.GetBytes(bytes);
            return BitConverter.ToInt32(bytes, 0);
        }
        #endregion

    }

}

前台HTML 代码

<input id="File_Audio" type="file" class="input_zpsck" name="File_Audio" runat="server" onmousemove="this.style.cursor='hand'"  onchange="File_View_Audio(this);" style="width: 200px" />
 <input type="hidden" id="dotype_commend" name="dotype_commend" />

前台JS 代码

 function File_View_Audio(obj) {
        var fName = obj.value;
        var idx = fName.lastIndexOf(".");
        var expName = fName.substring(idx + 1);
        expName = expName.toLowerCase();

        if (expName == "mp3" || expName == "wav" || expName == "mid") {
            document.getElementById('dotype_commend').value = "uploadAudio";
            document.getElementById('form1').submit();
        }
        else {
            alert("文件格式不正确！请选择正确的音频格式！");
        }
    }

后台C#代码：

定义全局变量

UploadFile upFile;
   public string dotype_commend = "";

在   Page_Load 方法中调用

  protected void Page_Load(object sender, EventArgs e)
  {
   if (Request["dotype_commend"] != null)
            {
                dotype_commend = Request["dotype_commend"].ToString();
            }
   if (dotype_commend.Equals("uploadAudio"))//上传音乐
            {
                string audio_url = "";
                if (File_Audio != null)
                {
                    audio_url = File_Audio.Value.Trim();
                }
                HtmlInputFile FileName = new HtmlInputFile();
                FileName = File_Audio;
                upFile = new UploadFile(FileName);
                if (audio_url.Length > 0)
                {
                    if (upFile.getUpFileSize() / 1024 < 50)
                    {
                        string strFilePath = upFile.getNewFileName().ToString();
                        string strExtension = upFile.GetExpName(".").ToString().ToLower();
                        //string strFileName = DateTime.Now.ToString("yyyyMMddHHmmss") + strExtension;//文件名重命名
                        string strPath = "../portraits/audio/";//图片路径
                        string strFileSaveAsPath = Server.MapPath(strPath);
                        upFile.saveFile(strFileSaveAsPath);
                    
                        #endregion
                    }
                    else
                    {
                        //showmsg += "alert('音频文件不能大于50K!');";
                        MessageBox.Show(this.Page, "音频文件不能大于50K!");
                    }
                }

            }
}