为什么C＃编译器认为我在使用可空的long时尝试使用sbyte重载？

Question

The following code

long? long1 = 1;
long? long2 = 2;
Math.Min(long1.Value, long2);

will result in the following error message on both arguments:

• "Argument 1: cannot convert from 'long' to 'sbyte'"
• "Argument 2: cannot convert from 'long?' to 'sbyte'"

I understand why this is an error, I know how to resolve the error.

My question is why is the compiler trying to choose the Math.Min(sbyte, sbyte) overload in this case (even when the first argument is not a nullable)?

Answer 1

它无法找到正确的重载，因此它默认为Math.cs中的第一个，恰好是public static sbyte Min(sbyte val1, sbyte val2)