How can I fix this up to do generic conversion to Nullable<T>?

Question

I currently use this handy conversion extension method to do conversions between types:

    public static T To<T>(this IConvertible obj)     {         return (T)Convert.ChangeType(obj, typeof(T));     } 

However, it doesn't like converting valid values to Nullable, for example, this fails:

    "1".To<int?>(); 

Obviously, 1 is easily converted to an (int?), but it gets the error:

    Invalid cast from 'System.String' to 'System.Nullable`1[[System.Int32, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]'. 

This is an obviously simplified example, in reality I'm using it to do conversions from string types like so:

packageDb.Quantity = package.package.ElementDeep(Namespace + "PackageQuantity", Namespace + "ActualQuantity", Namespace + "Quantity").ValueOrNull().To<int?>(); 

If Convert.ChangeType doesn't like Nullable, anyone have any great ideas?

Answer 1

public static T To<T>(this IConvertible obj) {     Type t = typeof(T);     Type u = Nullable.GetUnderlyingType(t);      if (u != null)     {         return (obj == null) ? default(T) : (T)Convert.ChangeType(obj, u);     }     else     {         return (T)Convert.ChangeType(obj, t);     } } 

Answer 2

public static T To<T>(this IConvertible obj)  {     Type t = typeof(T);     if (t.IsGenericType && t.GetGenericTypeDefinition() == typeof(Nullable<>))         t = t.GetGenericArguments()[0];      return (T)Convert.ChangeType(obj, t);  } 

But if the conversion fail, it will throw an exception, not returning a null as should be expected.