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TextChanged vs. SelectionChange events in WPF
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| I made the mistake of using the SelectionChange event on a
textbox while implementing some filtering on a DataGrid. What happened,
when using SelectionChanged, was that each time the textbox received focus
I was executing the filter. Even initially when there was nothing to
filter. My logic was checking if the contents of the textbox contained a
value or not. However, because the datagrid needed to be reset when the
user removed all the filter criteria, I still needed to execute the filter
when there was nothing in the filter textbox.
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if (textBox1.Text != "")
{
//Filter using the entered criteria
}
else
{
//Reset the filter to null
//Repopulate the datagrid with unfiltered data
}
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The else logic was being executed each time the textbox received focus.
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The simple solution was to change the event I used to execute the filter
from SelectionChange to TextChanged.
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The TextChanged event only fires when the value in the filter textbox is
modified. It does not fire when the control receives focus.
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It’s important to give some time and thought to performance and usability
from a user perspective. The ListCollectionView.Filter() method is very
fast and there was only a 2 second delay initially with about +6000 rows
and 30 columns.
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However, I recognized the fact that the logic was doing something that it
didn’t need to do. Therefore, I searched and implemented a solution that
reduced the resource requirement and increased the performance of the
system.
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I suggest you do the same with your implementations and programs.
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| Posts: 103 |
| Comments:
86 |
| Fundamentals:
13 |
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The sample code on this website is provided to illustrate a concept and should not be used in
applications or Web sites without proper professional consultation, as it may not illustrate
the safest coding practices. I assume no liability for incidental or consequential damages
should the sample code be used for purposes other than as intended.
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