public enum Animal
{
Dog = 1,
Cat = 2,
Cow = 3
}
int animalID = 4;
if ((Animal)animalID == Animal.Dog) // does not throw exception
animalID can t be casted to Animal.
Why don t I get InvalidCastException when casting enum to integer fails?
因为它不是无效的强制转换。
您正在强制转换的值超出了枚举的范围（在本例中），但它不是无效的。
由于枚举的批准类型是byte、sbyte、short、ushort、int、uint、long或ulong，因此从整数到枚举的强制转换是完全合法的。
这是一种有意的行为，可能非常有用。考虑使用[Flag]属性定义的枚举。
btw, this is a dupe of Casting an out-of-range number to an enum in C# does not produce an exception
更多答案可能在那里：）
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