对您来说它看起来像 C# 错误吗？

Question

创建一个控制台应用来重现：

struct Test
{
    public static readonly Test? Null = null;
}

class Program
{
    static void Main(string[] args)
    {
        var t = Test.Null;
    }
}

它是可编译的，但我们将在运行时得到以下内容：

An unhandled exception of type 'System.TypeLoadException' occurred in mscorlib.dll. Additional information: Could not load type 'ConsoleApplication17.Test' from assembly 'ConsoleApplication17, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.

这种方法解决了问题：

struct Test
{
    public static Test? Null => null;
}

Answer 1

This is known implementation limitation in CoreCLR - both the instance and static field layout is done together that results into this error. It is not easy to fix.

来源：Static fields should not contribute to cyclic struct layout #4049

对您来说它看起来像 C# 错误吗？

Does it look like a C# bug for you?

c#

struct

nullable