删除字符串最后一个字符的几种方法

字符串：string s = "1,2,3,4,"

实现效果：删除最后一个 ","

方法：
1.用Substring

s = s.Substring(0,s.Length - 1)

2.用 RTrim

s = s.ToString().RTrim(',')

3.用TrimEnd

s=s.TrimEnd(',')
//如果要删除"4,"，则需要这么写
char[] MyChar = {'4',','};
s = s.TrimEnd(MyChar);
//s = "1,2,3

4.用lastIndexOf()和deleteCharAt()
int index = sb.toString().lastIndexOf(',');
sb.deleteCharAt(index);