为什么根据ReSharper将double-to-int强制转换分配给动态变量是多余的？

Question

I have an assignment to a dynamic viewbag variable, which has to be an integer (yes, integer, without a fractional part, which breaks the libraries I'm using):

ViewBag.Autosubmit = (int)(SomeDate.Subtract(new DateTime(1970, 1, 1)).TotalSeconds);

TimeSpan.TotalSeconds returns a double , and to use it, I'm casting it into an int . But ReSharper says that casting to int is redundant. If I don't cast, the number stays as a double and my page doesn't work correctly.

Why is ReSharper telling me the cast is redundant?

Answer 1

I think this is because the cast is redundant as far as c# is concerned.. you are casting it but then putting it into a dynamic, which doesnt care if its an int or a double..

If you explicitly cast it to an int.. like Lasse V. Karlsen mentioned

int autoSubmit = (int)(SomeDate.Subtract(new DateTime(1970, 1, 1)).TotalSeconds);
ViewBag.Autosubmit = autoSubmit;

I believe the message will then go away.