How to make safe cast using generics in C#?
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by TN
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Published on 2010-03-30T21:58:30Z
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2010/03/30
22:03 UTC
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I want to implement a generic method on a generic class which would allow to cast safely, see example:
public class Foo<T> : IEnumerable<T>
{
...
public IEnumerable<R> SafeCast<R>()
where T : R
{
return this.Select(item => (R)item);
}
}
However, the compiler tells me that Foo<T>.SafeCast<R>() does not define parameter 'T'. I understand this message that I cannot specify a constraint on T in the method since it is not defined in the method. But how can I specify an inverse constraint?
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