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Difference between db.isopen and db != null

By : Pooja Nanda
Date : October 18 2020, 06:10 AM
To fix the issue you can do According to the documentation
code :
db != null
db = sess.getDatabase

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Difference between Popup's IsOpen and Visibility properties?

By : user1846674
Date : March 29 2020, 07:55 AM
hope this fix your issue I believe you are correct... it is pretty much superfluous. I think the issue is that the Visibility property is inherited from UIElement and could be interpreted to be "Should this have a normal visual representation".
Since a Popup doesn't have any visual representation in it's "default state... i.e.: when it's closed, the property doesn't mean much. IsOpen, however, is more of a behavior based property... i.e.: "Should a user be allowed to interact with my normally-hidden contents?". Or perhaps I'm just justifying Microsoft's work, here.

Difference between channel.isOpen() and channel.isConnected() in Netty?

By : clin
Date : March 29 2020, 07:55 AM
Hope this helps That's incorrect, a channel can be open and not connected, but a connected channel is necessarily open.
You can send data to an open channel that is not connected for connectionless transports using the write method that takes a SocketAddress as a parameter. Otherwise the channel needs to already be open and connected.

WPF Popup IsOpen issue

By : shivend s singh
Date : March 29 2020, 07:55 AM
I wish this helpful for you Turns out this was happening because it was inside a custom control which was derived from ListBox. It didn't seem relevant at the time I made this question, sorry.

TypeError: ShallowWrapper::state("isOpen") requires that `state` not be `null` or `undefined`

By : JonyColour
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further This error is due to the state in the component not being defined.
If you have your state defined in the class constructor (or as an instance property), this error will not occur.
code :
class MyComponent extends React.Component {
  constructor(props) {
    this.state = {/* initial state */}

What is the difference between IBM MQ's IsOpen and OpenStatus properties on a queue?

By : MrTurtle
Date : March 29 2020, 07:55 AM
With these it helps I dont think there's any better documentation, but in effect:
IsOpen tells you if the open call itself has been successful, ie there is an associated handle being maintained for the queue.
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