Question

I want to make a generic function for doing some operations, like:

ConvertValue<T>(string value)

If T is int then the function will convert the value to int and return the result.

Similarly, if T is boolean, the function will convert the value to boolean and return it.

How to write this?

Answer 1

Something like this?

public static T ConvertValue<T>(string value)
{
    return (T)Convert.ChangeType(value, typeof(T));
}

You can then use it like this:

int val = ConvertValue<int>("42");

Edit:

You can even do this more generic and not rely on a string parameter provided the type U implements IConvertible – this means you have to specify two type parameters though:

public static T ConvertValue<T,U>(U value) where U : IConvertible
{
    return (T)Convert.ChangeType(value, typeof(T));
}

I considered catching the InvalidCastException exception that might be raised by Convert.ChangeType() – but what would you return in this case? default(T)? It seems more appropriate having the caller deal with the exception.