C中一些字符串操作的常用用法

//獲得漢字的區(qū)位碼
     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解碼方式下的漢字碼
     array = System.Text.Encoding.Unicode.GetBytes("啊");
     i1 = (short)(array[0] - ''\0'');
     i2 = (short)(array[1] - ''\0'');
    //unicode反解碼為漢字
     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方式反解碼為漢字
     array[0] = (byte)196;
     array[1] = (byte)207;
     s = System.Text.Encoding.Default.GetString(array);
    //取字符串長度
     s = "iam方槍槍";
     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( "方槍槍");