Would IsSubclassOf() work here?

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Daniel Billingsley - 07 May 2004 12:42 GMT

Given
classA {}
Type typeA = typeof(ClassA);

1) isn't

checkType.IsSubclassOf(typeA)

going to always give the same results as
typeInheritsFrom(checkType, typeA)
given
bool typeInheritsFrom(Type typeToCheck, Type checkAgainst)
{
Type baseType = typeToCheck;
while (baseType != null)
{
if(baseType == checkAgainst)
return true;
baseType = baseType.BaseType;
}
}

2) Wouldn't
if (baseType is checkAgainst)
be a little clearer in C# than
if (baseType == checkAgainst)
even though I think it would work out to the same result.

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Daniel Billingsley - 07 May 2004 13:30 GMT

I was trying to write the original message too quickly I think -

I should have included the detail that checkType is always a class.

> Given
> classA {}
[quoted text clipped - 23 lines]
> if (baseType == checkAgainst)
> even though I think it would work out to the same result.

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Mattias Sj?gren - 07 May 2004 19:47 GMT

Daniel,

>1) isn't
>
>checkType.IsSubclassOf(typeA)
>
>going to always give the same results as
>typeInheritsFrom(checkType, typeA)

Almost. typeInheritsFrom would return true for

typeInheritsFrom(typeof(ClassA), typeof(ClassA))

but

typeof(ClassA).IsSubclassOf(typeof(ClassA))

returns false.

>2) Wouldn't
>if (baseType is checkAgainst)
>be a little clearer in C# than
>if (baseType == checkAgainst)
>even though I think it would work out to the same result.

if (baseType is checkAgainst)

isn't valid code.

Mattias

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Mattias Sjögren [MVP] mattias @ mvps.org
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Would IsSubclassOf() work here?

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