进行 C# 运行时类型识别的简化方法可以避免 NULL 检查? [英] Streamlined way to do C# run-time type identification that avoids a NULL check?

问题描述

我发现自己使用了一种常见的运行时类型识别模式，尤其是在编写处理不同类型控件的代码时.这是模式:

I find myself using a common run-time type identification pattern, especially when writing code that handles controls of varying types. Here is the pattern:

if (ctrl is ControlTypeEtc)
    (ctrl as ControlTypeEtc).SomeMethod();

我这样做是为了避免在 as 运算符返回 NULL 的情况下必须进行 NULL 检查.有没有办法将其简化为单个操作?

I do this to avoid having to do a NULL check in case the as operator returns NULL. Is there a way to streamline this to a single operation?

推荐答案

没有办法在一次操作中做到这一点.

No way to do this in a single operation.

但是，使用 as 并检查 null 成本更低，因为只有一种情况，而不是您的代码示例中的两种情况.

However, using as and checking for null is cheaper as there is only one case instead of two as in your code sample.

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