c# - 使用动态关键字转换泛型类型是否会导致装箱？

Question

以下代码是否会导致对传递给 GenericMethod 的调用中的整数进行装箱？

void GenericMethod<T>(T value)
{
  int test = (dynamic)value;
}

void Main()
{
  GenericMethod(100);
}

Answer 1

根据 C# 规范§4.7 动态类型:

dynamic is considered identical to object except in the following respects:

• Operations on expressions of type dynamic can be dynamically bound (§7.2.2).

• Type inference (§7.5.2) will prefer dynamic over object if both are candidates.

因此，转换为动态会导致装箱，其方式与转换为对象相同。