将js转换为C＃时出现System.OverflowException

Question

var pin = parseInt(form.mac.value.slice(-6), 16) % 10000000;

I'm convert the JS to C# like this

var pin = Convert.ToInt16(Networks[NetworkIndex, 0].Substring(Networks[NetworkIndex, 0].Length - 6)) % 10000000;

and then I get this error

An unhandled exception of type 'System.OverflowException' occurred in mscorlib.dll Additional information: Value was either too large or too small for an Int16.

Answer 1

The value is too big for Int16 . Try to use Convert.ToInt32 .

var pin = Convert.ToInt32(Networks[NetworkIndex, 0].Substring(Networks[NetworkIndex, 0].Length - 6)) % 10000000;

Answer 2

Use Convert.ToInt32 instead of Convert.ToInt16 . The value is too big to fit in Int16 .

The Int16 value type represents signed integers with values ranging from negative 32768 through positive 32767 . 307650 is way bigger than 32767 so you should use a bigger type to store the value in. Int16 uses 2 bytes of memory to store integral value, Int32 will use 4 bytes and can manage to store a bigger range of integers. Int32 is an immutable value type that represents signed integers with values that range from negative 2,147,483,648 through positive 2,147,483,647.

Try this one

var pin = Convert.ToInt32(Networks[NetworkIndex, 0].Substring(Networks[NetworkIndex, 0].Length - 6)) % 10000000;

Answer 3

You can also use int.TryParse("your number", out int) This will not throw any exception(When you'll get null in string.). If it is parsed then it means the value is correct or you can explicitly throw exception from your code.

Take a look.

Int.TryParse