类似aaa?a=1&b=2&c=3&d=4，如何将问号以后的数据变为键值对

string result = "aaa?a=1&b=2&c=3&d=4";
string[] array = result.Split('?');
//string a = System.Web.HttpUtility.ParseQueryString(array[1]).Get("a");
System.Collections.Specialized.NameValueCollection abcd = System.Web.HttpUtility.ParseQueryString(array[1]);
string a = abcd.Get("a");
string b = abcd.Get("b");
string c = abcd.Get("c");
string d = abcd.Get("d");

ParseQueryString的内部实现(字符串截取)：

 int num = (s != null) ? s.Length : 0;
 System.Collections.Specialized.NameValueCollection a = new System.Collections.Specialized.NameValueCollection();
            for (int i = 0; i < num; i++)
            {
                int startIndex = i;
                int num4 = -1;
                while (i < num)
                {
                    char ch = s[i];
                    if (ch == '=')
                    {
                        if (num4 < 0)
                        {
                            num4 = i;
                        }
                    }
                    else if (ch == '&')
                    {
                        break;
                    }
                    i++;
                }
                string str = null;
                string str2 = null;
                if (num4 >= 0)
                {
                    str = s.Substring(startIndex, num4 - startIndex);
                    str2 = s.Substring(num4 + 1, (i - num4) - 1);
                }
                else
                {
                    str2 = s.Substring(startIndex, i - startIndex);
                }

                a.Add(str, str2);

                if ((i == (num - 1)) && (s[i] == '&'))
                {
                    a.Add(null, string.Empty);
                }
            }

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