When C# bites

Jonathan — Wed, 28 Nov 2007 06:25:35 -0700

So I wanted to do:

private TTo Identity<TFrom,TTo>(TFrom I)
{
    return (TTo)I;
}

Well, actually I didn't. I wanted C# to be smart enough to realize that if S is a subtype of T then List<S> can safely be assumed to be a subtype of List<T>. But anyway, that's not the case, and you have to call ConvertAll on the List to get it to be a List<T> rather than a List<S>. Joy. Anyway, turns out the above fails to compile. Thankfully, this works:

private TTo Identity<TFrom,TTo>(TFrom I)
{
    return (TTo)(object)I;
}

But, argh.

Learn C# 3.0 With Our New Series!

pheaven — Wed, 21 Nov 2007 09:31:37 -0700

This week we are starting a brand new four part series, covering the new features of C# 3.0! The first article of the series covers type inference. You'll learn:
* What is type inference anyway?
* How can you take advantage of it?
* What does the new "var" keyword do?
* Is this at all related to Variant types in Visual Basic?
* Will using this hurt the performance of your programs at runtime?
Check out the article!

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When C# bites

Learn C# 3.0 With Our New Series!