In .net there is a class named WebClient which has a property named "QueryString" which is of type NameValueCollection (a collection of key/value pairs where each key can have one or more values).In .net there is a class named WebClient which
阅读背景：
如果要创建一个包含表示查询字符串的参数和参数的对象，那么哪种对象最适合此任务？
来源：互联网
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