C# byte和10进制、16进制相互转换

var srmp = new byte[4];
array.copy(encoding.utf8.getbytes(1.tostring("x2")), srmp, encoding.utf8.getbytes(1.tostring("x2")).length);
array.copy(encoding.utf8.getbytes((j + 1).tostring("x2")), 0, srmp, 1, encoding.utf8.getbytes((j + 1).tostring()).length);
 ushort leng = 1400;
byte[] a = new byte[2];
a[0] = (byte)(leng>>8);
a[1] = (byte)leng;
var ccc = bitconverter.tostring(a).replace("-", "");
var dddd = convert.toint32(ccc, 16); 
array.copy(a, 0, srmp, 2, a.length);