string sql1 ="SELECT Person_ID,Photo from Person Where Person_ID="+Person_ID;
sqlConnection1.Open();
SqlCommand myCommand1 =new SqlCommand(sql1,sqlConnection1);
SqlDataReader myReader1;
myReader1 = myCommand1.ExecuteReader();
if (myReader1.Read())
{
byte[] mydata=((byte[])myReader1["Photo"]);
FileInfo fi = new FileInfo("temp.bmp");
FileStream myStream=fi.Open(FileMode.Create);
//MemoryStream myStream=new MemoryStream();
foreach(byte a in mydata)
{
myStream.WriteByte(a);
}
MessageBox.Show("成功读入数据!") ;