上传文件方法

     /// <summary>上传文件方法
        /// 返回文件名
        /// </summary>
        /// <param name="myFileUpload">上传控件ID</param>
        /// <param name="allowExtensions">允许上传的扩展文件名类型,如:string[] allowExtensions = { ".doc", ".xls", ".ppt", ".jpg", ".gif" };</param>
        /// <param name="maxLength">允许上传的最大大小,以M为单位</param>
        /// <param name="savePath">保存文件的目录,注意是绝对路径,如:Server.MapPath("~/upload/");</param>
        public string Upload(FileUpload myFileUpload, string[] allowExtensions, int maxLength, string savePath)
        {
            // 文件格式是否允许上传
            bool fileAllow = false;

            //检查是否有文件案
            if (myFileUpload.HasFile)
            {
                // 检查文件大小, ContentLength获取的是字节,转成M的时候要除以2次1024
                if (myFileUpload.PostedFile.ContentLength / 1024 / 1024 >= maxLength)
                {
                    throw new Exception("只能上传小于" + maxLength + "M的文件!");
                }

                //取得上传文件之扩展文件名,并转换成小写字母
                string fileExtension = System.IO.Path.GetExtension(myFileUpload.FileName).ToLower();
                string tmp = "";   // 存储允许上传的文件后缀名
                //检查扩展文件名是否符合限定类型
                for (int i = 0; i < allowExtensions.Length; i++)
                {
                    tmp += i == allowExtensions.Length - 1 ? allowExtensions[i] : allowExtensions[i] + ",";
                    if (fileExtension == allowExtensions[i])
                    {
                        fileAllow = true;
                    }
                }

                if (fileAllow)
                {
                    try
                    {
                        string datedir = DateTime.Now.ToString("yyyyMMdd");
                        if (!Directory.Exists(savePath + datedir))
                        {
                            Directory.CreateDirectory(savePath + datedir);
                        }
                        // string saveName = Guid.NewGuid() + fileExtension;
                        string saveName = Guid.NewGuid() + fileExtension;
                        string path = savePath + datedir + "\\" + saveName;
                        //存储文件到文件夹
                        myFileUpload.SaveAs(path);
                        return "FileUploadUrl" + "\\" + datedir + "\\" + saveName;
                    }
                    catch (Exception ex)
                    {
                        throw new Exception(ex.Message);
                    }
                }
                else
                {
                    return "文件格式不符";
                    // throw new Exception("文件格式不符,可以上传的文件格式为:" + tmp);
                }
            }
            else
            {
                throw new Exception("请选择要上传的文件!");
            }
        }

 

posted @ 2019-04-30 15:32  聖潔  阅读(213)  评论(0编辑  收藏  举报