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POHow to fill a ListBox with a background worker in .Net2.0?
 

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  1. POHow to fill a ListBox with a background worker in .Net2.0?
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    <p>In my application a ListBox is filled after a user puts more than two characters into a textBox.</p> <p>If there is a lot to fill into the ListBox, the user has to wait until the ListBox is completely filled before is able to continue his input.</p> <p>Now I need a solution to fill the ListBox without blocking the UI, so I would like to use a background worker to solve this.</p> <p>---- Original Version -----</p> <p>In my application I fill a ListBox when the user puts in more then two characters into a textBox. The ListBox fills with results and after this, the user is able to put in more characters.</p> <p>My problem is the following behaviour: The user is only able to put in the next char <em>after</em> the whole ListBox is filled with all entries. If there are a lot of results the user has to wait until he is able to continue.</p> <p>I would like to have the following behaviour: If the user puts in a char, the filling of the ListBox should stop and build the list for the new input.</p> <p>I thought about sth. like:</p> <pre><code>[PSEUDO-CODE] loop over results { if (UserInput) { // &lt;-- GetKeyState()? break } AddOneItemToListBox } [/PSEUDO-CODE] </code></pre> <p>I thought about sth. like GetKeyState() but I think there should be a more elegant way (perhaps a control or another technology I don't know about ATM).</p> <p>P.S.: Currently I'm looking for a solution with .Net2.0, but if there is a technology inside a later version of .Net I would also be glad for a short hint (just for my information).</p>
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    1. COThe delay is because you're doing the updating on the UI thread. The user is blocked from doing anything with your application until your loop finishes running. Oliver's suggestion to use a `BackgroundWorker` instead is the simplest and probably best workaround. I'm not really sure why you were thinking of using `GetKeyState`; what would that do for you?
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      1. POHow to fill a ListBox with a background worker in .Net2.0?
      1. USCody Gray
    2. CO@Cody: If there is a user input I would like to leave the loop which is filling the ListBox.
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      1. POHow to fill a ListBox with a background worker in .Net2.0?
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    3. COI didn't suggest eliminating the loop. I suggested (see Oliver's answer for details) moving it to a `BackgroundWorker` thread. That way, the loop will run in the *background*, instead of blocking the user from entering characters. If this *isn't* what you're looking for, please edit your question to make your goal more clear.
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      1. POHow to fill a ListBox with a background worker in .Net2.0?
      1. USCody Gray
 

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