byte[]和文件FileStream相互转化

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using System.IO;//读filename到byte[]        private byte[] ReadFile(string fileName)        {            FileStream pFileStream = null;            byte[] pReadByte = new byte[0];            try            {                pFileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read);                BinaryReader r = new BinaryReader(pFileStream);                r.BaseStream.Seek(0, SeekOrigin.Begin);    //将文件指针设置到文件开                pReadByte = r.ReadBytes((int)r.BaseStream.Length);                return pReadByte;            }            catch            {                return pReadByte;            }            finally            {                if (pFileStream != null)                    pFileStream.Close();            }        }        //写byte[]到fileName        private bool writeFile(byte[] pReadByte, string fileName)        {            FileStream pFileStream = null;            try            {                pFileStream = new FileStream(fileName, FileMode.OpenOrCreate);                pFileStream.Write(pReadByte, 0, pReadByte.Length);            }            catch            {                return false;            }            finally            {                if (pFileStream != null)                    pFileStream.Close();            }            return true;        }        //测试        private void button6_Click(object sender, EventArgs e)        {            //by 闫磊 Email:Landgis@126.com,yanleigis@21cn.com 2007.11.23    byte[] b = ReadFile(@"c:\u.jpg");            if (writeFile(b, @"c:\u1.jpg"))                MessageBox.Show("成功");            elseMessageBox.Show("失败");        }
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