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Tag Archives: csharp

Things I’d like to see in C#: Conditional interface implementation

To explain this, imagine you are designing a type Wrapper<T>, which is just a simple wrapper around a type T.

class Wrapper<T>
{
T value;
public Wrapper(T theObject)
{
value = theObject;
}
// Some [...]

Posted 20 September 2008 † Porges § code ‡ Comments (0) ° Also tagged: , , ,

Implementing IEnumerable easily

Say that you’re implementing a linked list, and you want an enumerator:

public IEnumerator<T> GetEnumerator()
{
return new Stream<T,Node>(first,
node => node.next == null ? null : Tuple.Of(node.next, node.datum).AsNullable());
}

This uses the following utility class to implement the enumerator in one line (along with some code for Tuples [...]

Posted 04 April 2008 † Porges § code ‡ Comments (0) ° Also tagged: , ,

object.Equals handles null values correctly

Here’s the source code, as disassembled by Reflector:

public static bool Equals(object objA, object objB)
{
return ((objA == objB) || (((objA != null) && (objB != null)) && objA.Equals(objB)));
}

It seems that not even Microsoft knows this! I spotted this code, from ASP.NET’s MVC implementation, on Scott Hanselman’s blog:

return (other != null) &&
[...]

Posted 28 March 2008 † Porges § code ‡ Comments (0) ° Also tagged: , , , ,