How to CastTo properly ?

Replies to This Discussion

Permalink Reply by emlplsn on March 17, 2014 at 3:43pm

If the method doesn't end up in your if-statement the variable "target" will never be assigned. This is a requirement when using out-parameters. Setting "target" to null in an else-scope might be working. Something like this:

public bool CastTo<T>(out T target)
{
            if (typeof(T).IsAssignableFrom(typeof(int))) { 
                object ptr = this.data;
                target = (T)ptr;
                return true;
            }

            else{

               target = null;

               return false; // <- error

            }

}

Permalink Reply by David Rutten on March 19, 2014 at 9:13am

target = null;

won't work because T may be a value type. You should use:

target = default(T);

--

David Rutten

david@mcneel.com