Upcasting in C#: Making a Fruit a Pear
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by Adam Kane
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Published on 2010-06-09T23:34:25Z
Indexed on
2010/06/09
23:42 UTC
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Why can't I upcast (?) a Fruit to a Pear?
public static class PearGenerator {
public static Pear CreatePear () {
// Make a new generic fruit.
Fruit genericFruit = new Fruit();
// Upcast it to a pear. (Throws exception: Can't cast a Fruit to a Pear.)
Pear pear = (Pear)genericFruit;
// Return freshly grown pear.
return ( pear );
}
}
public class Fruit {
// some code
}
public class Pear : Fruit {
public void PutInPie () {
// some code
}
}
Thanks!
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