C# 中关于覆盖的类型签名差异
这次关于方差的问题略有不同。
我从实验中得知，C# 不允许用逆变函数覆盖虚函数？如果是这样，你会怎么做，因为我不断收到“找不到合适的方法重载”的消息。如果不是，为什么不呢？如果基类指定in的值永远是int，而子类可以取一个对象，问题出在哪里？
与返回类型相同，其重写签名应该是协变的
什么语言允许您执行此操作？ （C++/Java 我正在看着你）如果他们让你使用，方差是什么类型？ （返回类型/参数列表等）
您可以有多个覆盖吗？我不明白为什么不只要签名在技术上是唯一的。
为什么 C#/CLR 不支持方法重写 co /contra-variance?
我读了这篇文章，但没有看到任何问题的答案。我了解通用方差，而且我知道它很棒。我想了解方法签名方差，不仅在 C# 中，而且在 C# 中（即包括但不限于）。如果它不存在，我想要对此进行确认并进行解释（是实现细节吗？我的类型理论是否错误？是否只是 CLR/C# 碰巧不支持此特定功能？这是我没有的东西吗？没有想到，因为我不需要处理 CLR 的实现，因此不知道具体的复杂细节？）
slightly different question about variance this time.
I take it from experimentation that C# does not allow you to override a virtual function with a contravariant function? If it does, how do you do it, since I keep getting "suitable method overload not found." If it isn't, why not? if the base class specifies that the value in will always be an int, and the sub-class can take an object, where is the problem?
Same to return types, should be covariant in their overrride signature
What languages allow you to do this? (C++/Java I am looking at you) and if they let you use, variance what types? (return type/argument list etc.)
Could you have multiple overrides? I don't see why not as long as the signatures were technically unique.
Why does C#/CLR not support method override co/contra-variance?
I read this and I see no answers to any of the questions. I know about generic variance, and I know it's awesome. I want to know about method signature variance, and not just in C#, but also in C#(i.e. including but not limited to). If it doesn't exist I would like a confirmation of this and an explanation(is it an implementation detail? is my type theory wrong? Is it just the CLR/C# happens to not support this particular feature? Is it something I haven't thought of since I don't have to deal with implementing the CLR, and therefore don't know specific complex details?)
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找到了答案，C# 规范中的第 10.6.4 节规定重写必须具有相同的签名
Found the answer, section 10.6.4 in the C# specification states that overrides must have the same signature