Do calls made from Silverlight to Javascript through HtmlPage.Window.Invoke() return immediately or are they synchronous?
Do calls made from Silverlight to Javascript through HtmlPage.Window.Invoke() return immediately or are they
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Do calls made from Silverlight to Javascript through HtmlPage.Window.Invoke() return immediately or are they synchronous?
Invoke is synchronous from the point of view of your Silverlight code – control will not return to the Silverlight code until the JavaScript code returns. It’s easy to see this must be the case because
Invokereturns a value which you can use immediately.You can even call back into Silverlight from JavaScript via a
ScriptableMemberin a nested fashion during the call (though I wouldn’t recommend ping-ponging back and forth like that!).This synchronous calling can be problematic, not just for responsiveness – some nasty reentrancy issues can arise. I’d recommend either keeping JavaScript code you call from Silverlight as small as possible, or failing that set a timer to run some code, so that control will return immediately to Silverlight, and the code will execute from the JavaScript event loop instead (giving you effectively an asynchronous call).