asp.net上传图片(简单)

FileUpload：

protected void UploadButton_Click(object sender, EventArgs e)
    {
        long id = Request.QueryString["id"] == null ? -1 : Convert.ToInt64(Request.QueryString["id"]);
        string pname = id.ToString();
        //查找前台中创建的FileUpload1对象并获取路径
        FileUpload file=null ;
        for (int i = 0; i < DataList1.Items.Count; i++)
        {
             file = (FileUpload)DataList1.Items[i].FindControl("FileUpload1");
        }
        string uploadName = file.PostedFile.FileName.ToString(); //获取待上传图片的完整路径，包括文件名 

        string pictureName = "";//上传后的图片名，以当前表的主键为文件名，确保文件名没有重复 

        if (uploadName != "")
        {
            int idx = uploadName.LastIndexOf(".");
            string suffix = uploadName.Substring(idx);//获得上传的图片的后缀名 
            suffix = suffix.ToLower();

            if (suffix == ".jpg" || suffix == ".gif" ||  suffix == ".bmp" || suffix == ".png")  
            {
                pictureName = pname + suffix;

// 注：也可以当前时间为文件名
// pictureName = DateTime.Now.Ticks.ToString() + suffix; 
            }
            else 
            {
                Response.Write("<script>alert('图片格式不正确!')</script>");
                Response.End(); 
            }
        }
        try
        {
            if (uploadName != "")
            {
                string path = Server.MapPath("~/Photo/");
                file.PostedFile.SaveAs(path + pictureName);
                Response.Write("<script>alert('图片上传成功!')</script>");
            }
        }
        catch (Exception ex)
        {
            Response.Write(ex);
        } 
    }