namespace AuthenticationTestClient
{
    using System;
    using System.IO;
    using System.Windows.Forms;
    /// <summary>
    /// FileLoader 的摘要描述。
    /// </summary>
    public class FileLoader
    {
        public FileLoader()
        {
            //
            // TODO: 在此加入建構函式的程式碼
            //
        }
        [FlagsAttribute]
            public enum FileStyle {DOC, XLS};

        private byte[] _FileArray = new byte [1];

        public byte[] FileArray 
        {
            get    {return _FileArray;}
        }

        public static FileLoader LoadFile (FileStyle fFileStyle)
        {
            FileLoader fFileLoader = new FileLoader ();
            OpenFileDialog fOpenFileDialog = new OpenFileDialog ();
            fOpenFileDialog.Filter = fFileLoader.CombinFilter (fFileStyle);
            if (fOpenFileDialog.ShowDialog () == DialogResult.OK)
            {
                FileStream fStream = new FileStream (fOpenFileDialog.FileName, 
                    FileMode.Open, FileAccess.Read, FileShare.Read);
                fFileLoader._FileArray = new byte[fStream.Length];
                fStream.Read (fFileLoader._FileArray,0, (int)fStream.Length);
                fStream.Flush ();
                fStream.Close ();
            }
            else
            {
                return null;
            }
            return fFileLoader;
        }

        public static void SaveAs (byte[] fFileArray, FileStyle fFileStyle)
        {
            FileLoader fFileLoader = new FileLoader ();
            SaveFileDialog fFileDialog = new SaveFileDialog ();
            fFileDialog.Filter = fFileLoader.CombinFilter (fFileStyle);
            if (fFileDialog.ShowDialog() == DialogResult.OK )
            {
                string fFileName = fFileDialog.FileName ;
                FileStream fFile = new FileStream (fFileName, 
                    FileMode.Create, FileAccess .ReadWrite, FileShare.Read);
                fFile.Write (fFileArray, 0, fFileArray.Length );
                fFile.Flush ();
                fFile.Close ();
            }
        }

        /// <summary>
        /// 合并enum
        /// </summary>
        /// <param name="FilterStyle"></param>
        /// <returns></returns>
        private  string CombinFilter (FileStyle FilterStyle)
        {
            string FilterString = "";
            FileStyle[] StyleArray = (FileStyle[])Enum.GetValues (FilterStyle.GetType());
            for (int i = 0; i < StyleArray.Length; i++)
            {
                if (FilterString == "")
                    FilterString = FilterStr(StyleArray[i]);
                else
                {
                    FilterString = FilterString + '|' + FilterStr (StyleArray[i]);
                }
            }
            return FilterString;
        }

        /// <summary>
        /// 取得實際的篩選值
        /// </summary>
        /// <param name="FilterStyle"></param>
        /// <returns></returns>
        private string FilterStr (FileStyle FilterStyle)
        {
            string FilterString = "";
            switch (FilterStyle)
            {
                case FileStyle.DOC:
                    FilterString = "DOC (*.doc)|*.doc";
                    break;
                case FileStyle.XLS:
                    FilterString = "XLS (*.xls)|*.xls";
                    break;
                default:
                    break;
            }
            return FilterString ;
        }
    }
}

            FileLoader.SaveAs( FileLoader.LoadFile(FileLoader.FileStyle.DOC).FileArray,FileLoader.FileStyle.DOC);