C#扩展方法

引用：http://www.cnblogs.com/suger/archive/2012/05/13/2498248.html

    public static Tvalue TryGetInDiction<Tvalue, Tkey>(this Dictionary<Tkey, Tvalue> dict, Tkey key)
    {
        Tvalue value;
        dict.TryGetValue(key,out value);
        return value;
    }


 BasePanel p = panelDict.TryGetInDiction(panelType);