//获得汉字的区位码
byte[] array = new byte[2];
array = System.Text.Encoding.Default.GetBytes("啊");
int i1 = (short)(array[0] - ''\0'');
int i2 = (short)(array[1] - ''\0'');
//unicode解码方式下的汉字码
array = System.Text.Encoding.Unicode.GetBytes("啊");
i1 = (short)(array[0] - ''\0'');
i2 = (short)(array[1] - ''\0'');
//unicode反解码为汉字
string str = "4a55";
string s1 = str.Substring(0,2);
string s2 = str.Substring(2,2);
int t1 = Convert.ToInt32(s1,16);
int t2 = Convert.ToInt32(s2,16);
array[0] = (byte)t1;
array[1] = (byte)t2;
string s = System.Text.Encoding.Unicode.GetString(array);
//default方式反解码为汉字
array[0] = (byte)196;
array[1] = (byte)207;
s = System.Text.Encoding.Default.GetString(array);
//取字符串长度
s = "iam方枪枪";
int len = s.Length;//will output as 6
byte[] sarr = System.Text.Encoding.Default.GetBytes(s);
len = sarr.Length;//will output as 3+3*2=9
//字符串相加
System.Text.StringBuilder sb = new System.Text.StringBuilder("");
sb.Append("i ");
sb.Append("am ");
sb.Append("方枪枪");
/////////////////////////////////////////////////////////////////////
string --> byte array
byte[] data=Syste.Text.Encoding.ASCII.GetBytes(string);
string --> byte
byte data = Convert.ToByte(string);
byte[]-->string
string string = Encoding.ASCII.GetString( bytes, 0, nBytesSize );
