FileType

using System;
using System.Globalization;
using System.IO;

namespace Core.IO {

    public sealed class FileType {

        public static bool IsDocFile(string strFilename) {
            return IsDocFileEx(Path.GetExtension(strFilename.ToUpper(CultureInfo.InvariantCulture)));
        }

        public static bool IsDocFileEx(string strExt) {
            return TestString(strExt,".DOC;.RTF");
        }

        public static bool IsExeFile(string strFilename) {
            return IsExeFileEx(Path.GetExtension(strFilename.ToUpper(CultureInfo.InvariantCulture)));
        }

        public static bool IsExeFileEx(string strExt) {
            return TestString(strExt,".EXE;.BAT;.COM;.CMD;.PIF;.DLL;.ad;.adp;.crt;.ins;.mdb;.mde;.msc;.msp;.sct;.shb;.vb;.wsc;.wsf;.cpl;.shs;.vsd;.vst;.vss;.vsw;.bas;.chm;.cmd;.hlp;.hta;.inf;.isp.js;.jse;.lnk;.msi;.mst;.pcd;.reg;.scr;.url;.vbe;.vbs;.ws ;.wsh ");
        }

        public static bool IsImage(string strFilename) {
            return IsImageEx(Path.GetExtension(strFilename.ToUpper(CultureInfo.InvariantCulture)));
        }

        public static bool IsImageEx(string strExt) {
            return TestString(strExt,".JPG;.GIF;.BMP;.JPEG;.TIFF;.TIF;.IFF;.PIC;.RAW;.PCX;.PNG;.PSD;.SGI;.TGA;.RSB");
        }

        public static bool IsMusic(string strFilename) {
            return IsMusicEx(Path.GetExtension(strFilename.ToUpper(CultureInfo.InvariantCulture)));
        }

        public static bool IsMusicEx(string strExt) {
            return TestString(strExt,".MP3;.WAV;.WMA");
        }

        public static bool IsTxtFile(string strFilename) {
            return IsTxtFileEx(Path.GetExtension(strFilename.ToUpper(CultureInfo.InvariantCulture)));
        }

        public static bool IsTxtFileEx(string strExt) {
            return TestString(strExt,".TXT");
        }

        public static bool IsVideo(string strFilename) {
            return IsVideoEx(Path.GetExtension(strFilename.ToUpper(CultureInfo.InvariantCulture)));
        }

        public static bool IsVideoEx(string strExt) {
            return TestString(strExt,".AVI;.MPG;.MPEG;.RM;.RAM;.MOV;.MP4;.WMV");
        }

        public static bool IsXLSFile(string strFilename) {
            return IsXLSFileEx(Path.GetExtension(strFilename.ToUpper(CultureInfo.InvariantCulture)));
        }

        public static bool IsXLSFileEx(string strExt) {
            return TestString(strExt,".XLS");
        }

        private static bool TestString(string strSub,string strLong) {
            return (strLong.ToUpper(CultureInfo.InvariantCulture).IndexOf(strSub.ToUpper(CultureInfo.InvariantCulture)) != -1);
        }
    }
}