一个基础有关问题，帮忙解答

一个基础问题，帮忙解答
Dictionary<string, 实体> dic = new Dictionary<string, 实体>();

请问这个实体是如何定义的，请给出例子及如何调用，谢谢。不好意思，基础没学好

[解决办法]

C# code

Dictionary<string, object> dic = new Dictionary<string, object>();Dictionary<string, string> dic = new Dictionary<string, string>();Dictionary<string, int> dic = new Dictionary<string, int>();class aa{string bb;int cc;}Dictionary<string, aa> dic = new Dictionary<string, aa>();