常用通用简单文件上传功能

  1 /// <summary>
  2     /// Web文件上传简单处理
  3     /// </summary>
  4     public class UploadFileHandler
  5     {
  6         private readonly HttpPostedFileBase _baseFile;
  7 
  8         public UploadFileHandler(HttpPostedFileBase baseFile)
  9         {
 10             if (_baseFile == null)
 11                 throw new ArgumentNullException("baseFile");
 12             _baseFile = baseFile;
 13         }
 14 
 15         /// <summary>
 16         /// 文件后缀验证
 17         /// </summary>
 18         /// <param name="regexp">例如:jpg|jpeg|bmp|gif</param>
 19         /// <returns>true:验证通过,false:格式不正确</returns>
 20         private bool VerifySuffix(string regexp)
 21         {
 22             if (regexp.IndexOf('|') == -1) throw new ArgumentException("验证文件类型表达式格式不正确");
 23             string regExp = string.Format(@"^.*?.({0})$", regexp);
 24             var suffix = GetFileSuffix();
 25             return !string.IsNullOrEmpty(suffix) && Regex.IsMatch(suffix, regExp);
 26         }
 27 
 28         /// <summary>
 29         /// 获取文件后缀名,包含"."
 30         /// </summary>
 31         /// <returns></returns>
 32         private string GetFileSuffix()
 33         {
 34             return Path.GetExtension(_baseFile.FileName);
 35         }
 36 
 37         /// <summary>
 38         /// 文件夹目录处理
 39         /// </summary>
 40         /// <param name="path"></param>
 41         private static void DirectoryProcess(string path)
 42         {
 43             if (!Directory.Exists(path)) Directory.CreateDirectory(path);
 44         }
 45 
 46         /// <summary>
 47         /// 保存上传文件,设置文件格式
 48         /// </summary>
 49         /// <param name="suffixs">例如:jpg|jpeg|bmp|gif </param>
 50         /// <returns></returns>
 51         public string Save(string suffixs)
 52         {
 53             return Save(null, null, null, suffixs);
 54         }
 55 
 56         /// <summary>
 57         /// 保存上传文件,设置上传文件名称
 58         /// 默认路径为System.IO.Directory.GetCurrentDirectory()
 59         /// </summary>
 60         /// <param name="getNameFunc">设置上传文件名称方法</param>
 61         public string Save(Func<string> getNameFunc)
 62         {
 63             return Save(null, null, getNameFunc);
 64         }
 65 
 66         /// <summary>
 67         /// 保存上传文件,设置上传文件名称和文件格式
 68         /// 默认路径为System.IO.Directory.GetCurrentDirectory()
 69         /// </summary>
 70         /// <param name="suffixs"> </param>
 71         /// <param name="getNameFunc">设置上传文件名称方法</param>
 72         public string Save(string suffixs, Func<string> getNameFunc)
 73         {
 74             return Save(null, null, getNameFunc, suffixs);
 75         }
 76 
 77         /// <summary>
 78         /// 保存上传文件,设置上传文件名称,路径为HttpContext.MapPath
 79         /// </summary>
 80         /// <param name="httpContext">当前请求处理的上下文对象</param>
 81         /// <param name="virtualPath">虚拟目录</param>
 82         /// <param name="getNameFunc">获取上传文件名称</param>
 83         /// <param name="suffixs">例如:jpg|jpeg|bmp|gif </param>
 84         /// <returns></returns>
 85         public string Save(HttpContext httpContext, string virtualPath, Func<string> getNameFunc = null, string suffixs = "txt|docx|doc|jpg|jpeg|bmp|gif|xlsx|xls")
 86         {
 87             string suffix = GetFileSuffix();
 88 
 89             if (!VerifySuffix(suffixs)) throw new ArgumentException("文件格式不正确");
 90 
 91             string path;
 92 
 93             if (httpContext == null || string.IsNullOrEmpty(virtualPath))
 94                 path = Directory.GetCurrentDirectory();
 95             else
 96                 path = httpContext.Server.MapPath(virtualPath);
 97 
 98             string fileName = getNameFunc == null ? Guid.NewGuid().ToString() : getNameFunc();
 99 
100             if (string.IsNullOrEmpty(fileName)) throw new ArgumentException("设置上传文件名方法错误");
101 
102             string fullFileName = path + fileName + suffix;
103             DirectoryProcess(path);
104             _baseFile.SaveAs(fullFileName);
105             return fullFileName;
106         }
107     }