Cannot implicitly convert type 'T' to 'Int'

You can set constraint:

public int Change<T>(Stats type, T value) where T : IConvertible

Then:

var intValue = value.ToInt32();

Or another way (object cast is necessary not typo)

t += (int)(object)value;

Or use dynamic, by using dynamic you can do more, such as implicit casts

Or use Int32 - Int32 and int are both struct internally. No performance loss

you can try casting the value like this ...

t += (int)value;

t+= Convert.ToInt32(value);

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