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

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CSDN文章移动来源：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

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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)：

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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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