C＃：在运行时获取值类型变量的大小？ [英] C#: Getting size of a value-type variable at runtime?

问题描述

我知道C和C ++等语言允许在运行时使用sizeof（）函数确定数据（结构，数组，变量...）的大小。我在C＃中尝试过，显然不允许将变量放入sizeof（）函数中，而只能输入定义（浮点数，字节，Int32，uint等），我应该怎么做？

I know languages such as C and C++ allow determining the size of data (structs, arrays, variables...) at runtime using sizeof() function. I tried that in C# and apparently it does not allow putting variables into the sizeof() function, but type defintions only (float, byte, Int32, uint, etc...), how am I supposed to do that?

实际上，我希望这种情况发生：

Practically, I want this to happen:

int x;
Console.WriteLine(sizeof(x));   // Output: 4

而不是：

Console.WriteLine(sizeof(int)); // Output: 4

我敢肯定有一些正常的方法可以在运行时获取数据大小在C＃中，但google并没有提供太多帮助。.这是我最后的希望

I'm sure there's some normal way to get the size of data at runtime in C#, yet google didn't give much help.. Here it is my last hope

推荐答案

以查找任意变量 x ，在运行时可以使用 Marshal.SizeOf ：

To find the size of an arbitrary variable, x, at runtime you can use Marshal.SizeOf:

System.Runtime.InteropServices.Marshal.SizeOf(x)

如dtb所述，此函数返回编组后的变量的大小，但是根据我的经验，通常这就是您想要的大小，例如在纯托管环境中，变量的大小几乎没有兴趣。

As mentioned by dtb, this function returns the size of the variable after marshalling, but in my experience that is usually the size you want, as in a pure managed environment the size of a variable is of little interest.

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