Updating listbox using a thread in man dating woman salvador
Or I could have instantiated a delegate: You can also use the Action delegate with anonymous methods to update the main thread from the worker thread.
If you’re using List Views in c# (Winforms or WPF – like a List Box – but better), you’ve probably wanted to update the List View data (Items Source – I also hope you’re using binding) without blocking the UI.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 You have made the form Chassis a subform and to refer to subforms in a Query you have to use this syntax: [Forms]! On the first tab, I have another form (frm Chassis), on which there is a listbox which is related to the current record by the [Serial Number] field. This list box updates perfectly when navigating between records when I just have the frm Chassis form open - but when I open the main form (with the tabbed control), and navigate the frm Chassis records, the listbox does not update.
The listbox has a rowsource of a query, which refers to the form as [Forms]!
Any long-running operation must be performed on a background thread to avoid freezing the user interface.
Copy the database dataset, by creating new dataset and declaring by main Dataset.If the items come in bursts or require processing between adding each one, then you might want to think about running the processing behind the scenes (via a backgroundworker or a Task).But, if you are just taking data and populating the list, then you are required to use the UI thread.I wanted this to be constantly updating in the background, so I spawned a new thread for handling updating this, but when I made the call to add an item I get the error message "The calling thread cannot access this object because a different thread owns it." Any idea how I can update the listbox from another thread? Ok thats a lot in one line let me go over it: When you want to update a UI control you, as the message says, have to do it from the UI thread.There is built in way to pass a delegate (a method) to the UI thread: the will return immediately so your other thread you are calling from can continue (the Dispatcher will run your delegate soon as it can which will probably be straight away anyway).
Anyone writing smart client applications will eventually run into a situation where some work must be performed asynchronously on a background thread.