协方差和逆差 [英] CoVariance and Contravariance

问题描述

大家好，



我对C＃中的CoVariance和Contravariance了解不多。

我只关注这个问题是，

何时使用？

使用程序员获得的好处？

在我们使用这些概念的上下文级别我想要知道吗？



如果可能的通用代表细节，即Func< t ....，tresult>



请在此建议。



谢谢

Vamsi krishna

Hi All,

I know little bit about the CoVariance and Contravariance in C#.
I am having only concern in this is,
When to Use ?
upon using what benefits a programmer gets ?
under which level of context we use these concepts i just want to know?

If possible detail of generic delegate ie Func<t....,tresult>

Please suggest on this.

Thanks
Vamsi krishna

推荐答案

马克在他的文章中解释了这一点。问你是否有任何问题

C＃语言特征，从C＃2.0到4.0 - 协方差和逆变化 [ ^ ]

Marc explained about this in his article & ask him if you have any questions
C# Language Features, From C# 2.0 to 4.0 - Covariance and Contravariance[^]

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