using(FileStream readStream = new FileStream(txtOrgFilePath.Text,FileMode.Open))
{
using(FileStream writeStream = new FileStream (txtFinalFilePath.Text,FileMode.Create))
{
byte[] bytes = new byte[1024 * 1024 * 8];
int readBytes;
while ((readBytes = readStream.Read(bytes, 0, bytes.Length)) > 0)
{
writeStream.Write(bytes, 0, readBytes);
}

//while ((readStream.Read(bytes, 0, bytes.Length)) > 0)
//{
// writeStream.Write(bytes, 0, readStream.Read(bytes, 0, bytes.Length));
//}
}
}

我只是将第一个里面事先声明的readBytes的位子全部用readStream.Read(bytes, 0, bytes.Length)代替了 结果流出来的文件却打不开了是怎么回事？？  而且文件明显变小。。。不替换是可以得出正常结果的。。。