C#中一些字符串操作的常用用法(转载)

此文转载自http://www.lzhm.net/read.aspx?ID=89//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 arraybyte[] data=Syste.Text.Encoding.ASCII.GetBytes(string);string --> bytebyte data = Convert.ToByte(string);byte[]-->stringstring string = Encoding.ASCII.GetString( bytes, 0, nBytesSize );