CODEWITHSUNDEEP
arraysc++-cli
dlf
dlf

Reputation: 9393

Can't convert managed array to IReadOnlyList

The following C# code compiles and runs just fine:

private static IReadOnlyList<int> Foo()
{
    return new int[10];
}

However, the (supposed) equivalent C++/CLI code gives a compile error:

Error C2440 'return': cannot convert from 'cli::array<int,1> ^' to 'System::Collections::Generic::IReadOnlyList<int> ^'

static IReadOnlyList<int>^ Foo()
{
    return gcnew array<int>(10);
}

The error message makes it sound as though C++/CLI has its own special array class that it's using under the hood, which is different from what C# does and which doesn't implement IReadOnlyList (or IList, or ICollection; IEnumerable does work, though). Is that correct? Is there a workaround?

Upvotes: 2

Views: 1359

Answers (1)

dlf
dlf

Reputation: 9393

Apparently all you need to do is add an explicit cast:

static IReadOnlyList<int>^ Foo()
{
    return (IReadOnlyList<int>^)gcnew array<int>(10);
}

(I confirmed this does not blow up a runtime)

Upvotes: 2

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