可为空类型是BCL,CLR还是两者都实现? [英] Nullable<> types are a BCL, CLR, or both implementation?
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问题描述
前段时间,我认为Nullable <>值类型是类,封装了值类型和对HasValue的定义。
Some time ago I thought that Nullable<> value types are classes, encapsulating value types and a bool to HasValue. With some implicit cast operador for null, just implemented at BCL.
但是作为一个结构,如何实现呢? Nullable<>结构对于CLR是特殊的吗?
But being a struct, how this can be achieved? Nullable<> struct is "special" for CLR?
推荐答案
Nullable< T>
被定义为普通结构,但CLR中有特殊的钩子可以将 [mscorlib] System.Nullable`1
的实例装箱/拆箱为空,具体取决于 HasValue
属性。在此处
Nullable<T>
is defined as a normal struct, but there's special hooks within the CLR to box/unbox an instance of [mscorlib]System.Nullable`1
to null according to the HasValue
property. There's more details on this here
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