string s="海1";
byte[] b1 = System.Text.Encoding.Default.GetBytes(s);
//byte[] b2 = System.Text.Encoding.Unicode.GetBytes(s);
MessageBox.Show(b1.Length.ToString());
// MessageBox.Show(b2.Length.ToString());
byte[] b1 = System.Text.Encoding.Default.GetBytes(s);
//byte[] b2 = System.Text.Encoding.Unicode.GetBytes(s);
MessageBox.Show(b1.Length.ToString());
// MessageBox.Show(b2.Length.ToString());
http://expert.csdn.net/Expert/topic/1247/1247234.xml?temp=.9179346
System.Text.Encoding.Unicode.GetBytes(str);//3
System.Text.Encoding.Default.GetBytes(str);//2