NameValueCollection集合

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NameValueCollection，它有一个特点：允许在一个键下存储多个字符串值。

NameValueCollection query = new NameValueCollection();query.Add("MVC", "Model");query.Add("MVC", "Control");query.Add("MVC", "View");query.Add("ASP.NET", "MVC");StringBuilder sb = new StringBuilder();foreach (string key in query.Keys){   // sb.AppendFormat("{0}={1}", key, query[key]);    string[] values = query[key].Split(new char[] { ',' });    if (values.Count() > 1)        foreach (var value in values)        {            sb.AppendFormat("{0}={1}\r\n", key, value);        }    else    {        sb.AppendFormat("{0}={1}\r\n", key,query[key]);    }}Console.WriteLine(sb.ToString());