c# 读取二进制文件并以16进制报文显示出来

//新建一个文件对话框
OpenFileDialog pOpenFileDialog = new OpenFileDialog();

//设置对话框标题
pOpenFileDialog.Title = "打开二进制文件";

//设置打开文件类型
pOpenFileDialog.Filter = "bin文件（*.*）|*.*";

//监测文件是否存在
pOpenFileDialog.CheckFileExists = true;

//文件打开后执行以下程序
if (pOpenFileDialog.ShowDialog() == DialogResult.OK)
{

System.IO.Path.GetFullPath(pOpenFileDialog.FileName); //绝对路径
System.IO.Path.GetExtension(pOpenFileDialog.FileName); //文件扩展名
System.IO.Path.GetFileNameWithoutExtension(pOpenFileDialog.FileName);//文件名没有扩展名
System.IO.Path.GetFileName(pOpenFileDialog.FileName); //得到文件
System.IO.Path.GetDirectoryName(pOpenFileDialog.FileName);                  //得到路径

}

FileStream inStream = new FileStream(pOpenFileDialog.FileName,FileMode.Open,FileAccess.Read);
long nBytesToRead = inStream.Length;
buffer = new byte[nBytesToRead];
int m=inStream.Read(buffer,0,buffer.Length);

inStream.Close();

//显示到richtextbox1 控件中，并且用  隔开

richTextBox1.Clear();
for(int i=0;i<buffer.Length;i++)
{
richTextBox1.AppendText(buffer[i].ToString("X2")+" ");
}