上传图片

using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;

//WEB目录new文件名upload.aspx.cs

public partial class new_upload : System.Web.UI.Page
{
    private const string strFileTypeAllow = "|image/pjpeg|image/gif|image/png|image/bmp|image/x-png|";//允许的文件类型
    private const long lngFileMaxLenthAllow = 1048576;//最大的文件大小
    private const string strUploadPath = "UploadFiles/";//路径
    protected string strChangeSingleNum(string strNum)
    {
        if (strNum.Length < 2)
            return "0" + strNum;
        else
            return strNum;
    }
    private string strChangeSingleNum(int intNum)
    {
        string strNum = intNum.ToString();
        if (strNum.Length < 2)
            return ("0" + strNum);
        else
            return strNum;
    }
    protected void Page_Load(object sender, EventArgs e)
    {
    }
    protected void btnUpload_Click(object sender, EventArgs e)
    {
        HttpPostedFile hpfRcvFile = inFile.PostedFile;
        string strLocalFileName;
        if (strFileTypeAllow.IndexOf("|" + hpfRcvFile.ContentType + "|") >= 0 && hpfRcvFile.ContentLength <= lngFileMaxLenthAllow)
        {
            //取得扩展名
            string[] strTemp = hpfRcvFile.FileName.Split('.');
            string strExtName = strTemp[strTemp.Length - 1];
            //获取随机字符串做文件名
            DateTime datNow = DateTime.Now;
            string strYear = datNow.Year.ToString();
            string strMonth = datNow.Month.ToString();
            string strDay = datNow.Day.ToString();
            strMonth = strChangeSingleNum(strMonth);
            strDay = strChangeSingleNum(strDay);
            Random ranMy = new Random();
            strLocalFileName=strYear+strMonth+strDay+ranMy.Next(1000000,9999999).ToString()+"."+strExtName;
            //按照设定保存文件
            hpfRcvFile.SaveAs(Server.MapPath(strUploadPath)+strLocalFileName);
            //显示成功信息
            Response.Redirect("thankyou.aspx");
        }
        else
            //显示错误信息
            Response.Redirect("showError.aspx?ErrMsg=非法的文件类型或文件大小不合适！");

        inFile.PostedFile.SaveAs(Server.MapPath("temp.jpg"));
        Response.Write("文件"+inFile.PostedFile.FileName + "上传成功！大小："+inFile.PostedFile.ContentLength.ToString()+"<br>传输类型:"+inFile.PostedFile.ContentType);
    }
   
}