C# 加密小工具代码实现

DialogResult diaResult = this.openFile.ShowDialog();
if (diaResult == DialogResult.OK)
{        
//内部可以获取文件名之类的信息
}

FileInfo fi = new FileInfo(pathName);
filetype = fi.Extension;//文件拓展名
filesize = fi.Length;//文件信息的字节数

openFileSave.InitialDirectory = "E:\\Work\\Vs\\TestEncryption\\加密处理\\保存文件";
openFileSave.InitialDirectory = @"E:\\Work\\Vs\\TestEncryption\\加密处理\\保存文件";

        /// <summary>
        /// 读取执行路径下文件信息
        /// </summary>
        /// <param name="filename">指定的路径</param>
        /// <param name="start">起始位置，一般设为零</param>
        /// <param name="length">文件信息的长度</param>
        /// <returns></returns>
        public static byte[] ReadFile(string filename, int start, int length)
        {
            byte[] btFile = null;
            using (FileStream fs = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.Read))
            {
                btFile = new byte[length];
                fs.Seek(start, SeekOrigin.Begin);
                fs.Read(btFile, 0, length);
            }
            return btFile;
        }

//将byte数组转换为string
        public static string BytesToString(byte[] bt)
        {
            return Encoding.UTF8.GetString(bt);
        }