/// <summary> /// 根据前两个字节获取文件后缀名,获取不到时使用文件名截取方法获取 /// </summary> /// <param name="filename"></param> /// <param name="filecontent"></param> /// <returns></returns> public static string GetFileExt(string filename, byte[] filecontent) { var result = string.Empty; if (filecontent != null && filecontent.Length > 1) { var fileCode = filecontent[0].ToString() + filecontent[1].ToString(); switch ((FileExtension)IntegerCore.Parse(fileCode)) { case FileExtension.JPG: result = "jpg"; break; case FileExtension.JS: result = "js"; break; case FileExtension.GIF: result = "gif"; break; case FileExtension.BMP: result = "bmp"; break; case FileExtension.PNG: result = "png"; break; case FileExtension.RAR: result = "rar"; break; //case FileExtension.ZIP: // result = "zip"; // break; case FileExtension.MP3: result = "mp3"; break; default: if (filecontent[0] == 0 && filecontent[1] == 0 && filecontent[2] == 0) { result = "mp4"; } break; } } else if (!string.IsNullOrEmpty(filename) && filename.IndexOf('.') > -1) { result = filename.Substring(filename.LastIndexOf('.') + 1); } return(result); }
/// <summary> /// 判断文件是否为安全文件 /// </summary> /// <param name="stream"></param> /// <param name="exts"></param> /// <returns></returns> public static bool IsSafeFile(byte[] content, params FileExtension[] exts) { if (content == null || content.Length < 2 || exts == null || exts.Length < 1) { return(false); } var typeStr = content[0].ToString() + content[1].ToString(); var fileType = (FileExtension)IntegerCore.Parse(typeStr); return(exts.Contains(fileType)); }
public static DateTime GetDateTime(string key) { return(IntegerCore.ParseDateTime(GetSafeString(key), new DateTime(1900, 1, 1))); }