C#几种截取字符串的方法

//分隔字符串
string[] sArray=st.Split('c');
string[] sArray = str.Split(new char[2] { 'a', 'b' });
string[] sArray = str.Split( new string[]{"SA","SB"}, StringSplitOptions.RemoveEmptyEntries);
//取从i开始length个(默认到结束)字符
str.Substring(start_index);
str.Substring(start_index, length);
//替换字符串
str.Replace(old_str,new_str);
//删除字符串
str.remove(start_index,length);