CODEWITHSUNDEEP
windows-runtimewin-universal-appmsdnwindows-10-universalc++-cx
ZivS
ZivS

Reputation: 2124

UWP: PropertySet lookup throws an exception

Windows.Foundation.Collections has a collection called PropertySet which according to MSDN has a lookup method which returns:

The value, if an item with the specified key exists; otherwise, null.

When I try the following I get an (unexpected) exception:

try
{
    auto propertySet = ref new Windows::Foundation::Collections::PropertySet();
    auto something = propertySet->Lookup("nothing");
    if (something != nullptr)
    {
        // Something was found :|
    }
    else 
    {
        // Found nothing :)
    }
}catch(Platform::Exception^ e)
{
    //Exception: e->Message
}

and e->Message is:

The operation attempted to access data outside the valid range

I couldn't find anything on MSDN regarding this issue.

Am I doing something wrong here, or is this a Microsoft bug \ wrong documentation?

EDIT:

1- I'm using windows 10 with SDK version 10.0.10240.0

2- I'm using C++/CX, not C# (if this was not clear)

Upvotes: 2

Views: 267

Answers (1)

Raymond Chen
Raymond Chen

Reputation: 45172

The documentation is incorrect. I will ask for it to be fixed. If the key does not exist, Lookup raises a Platform::OutOfBoundsException (internally: E_BOUNDS). To check whether a key exists, use the HasKey method.

Upvotes: 4

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