字符串操作问题

[moduofanchen]

string aa="a,b,c,e,f,g,";
string bb="a,e,"
string cc="";
问
怎么得到
cc="b,c,f,g";

[MSDNXGH]

        string[] c=bb.Split(',');
        for (int i = 0; i < c.Length;i++ )
        {
            aa=aa.Replace(c[i] + ",", "");
        }
        return aa;

[huangwenquan123]

            string aa = "a,b,c,e,f,g,";
            string bb = "a,e,";
            IEnumerable<string> list = aa.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries).Except(bb.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries));
            string cc = string.Join(",", list.ToArray());
            Console.WriteLine(cc);

[dalmeeme]

string aa = "a,b,c,e,f,g,";
string bb = "a,e,";
string t = bb.Replace(",", ",:");
string[] s = t.Split(':');
string r = aa;
foreach (string word in s)
if (word.Length > 0)
r = r.Replace(word, "");
Response.Write(r);

输出：b,c,f,g,

[该用户懒的设置]

class Program
{
public static void Main(string[] args)
{
console.writeline(gg());
}
static string gg()
　　｛
string aa ="a,b,c,d,"
string bb=""
　　　　
　　　｝
}