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Editorial Team
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Asked: 2026-06-12T22:13:46+00:00

We are writing a Windows Store app. A lot of the data processing and

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We are writing a Windows Store app. A lot of the data processing and aggregation is done in a WinRT component and the UI is written in WinJS/HTML. One of the main issues we are running into is the inability of WinJS to bind to WinRT objects. Specifically, the WinJS runtime throws an exception that it cannot extend the WinRT object. This is in a line of code that tries to define a new property on the data object. This works fine for WinJS objects as they are dynamic. Not so for WinRT. The only way I can bind is via oneTime bindings, because this doesn’t try to create an Observable object out of the WinRT object. Is there some kind of interface the WinRT objects can implement to support one way or even two way binding?

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1 Answer

  1. Editorial Team

    No, this isn’t possible without creating your own wrapper that would either:

    • “Proxy” the WinRT object, and make that proxy listen for events from the WinRT object and set the properties
    • Make something that looks like an observable and projected up from the WinRT layer (e.g. it has a “bind” function that takes a callback etc.
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