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POWhat is the best way to mask an UI Event?
 

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  1. POWhat is the best way to mask an UI Event?
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    <p>I am working with a DataGridView, and I use the <code>CellValueChanged</code> event.</p> <p>I dont want this event to be triggered when I change a cell value by the code. However, I want it to be triggered when the user edits it.</p> <p>That's why I enclose my cell value change operations with the following code :</p> <pre><code>void changeCellOperation() { dgv.CellValueChanged -= new DataGridViewCellEventHandler(dgv_CellValueChanged); ... cell.Value = myNewCellValue ... dgv.CellValueChanged += new DataGridViewCellEventHandler(dgv_CellValueChanged); } </code></pre> <p>I ended to have several differents functions where my DataGridView cells are updated this way.</p> <p>Because these functions are called from different places and can be nested, I cannot afford to keep this code as is to avoid event unwanted event reactivation.</p> <p>So I ended up this way :</p> <pre><code>int valueChangedEventMask = 0; void changeCellOperation() { valueChangedEventMask++; ... cell.Value = myNewCellValue ... valueChangedEventMask--; } void dgv_CellValueChanged(object sender, DataGridViewCellEventArgs e) { if (valueChangedEventMask &gt; 0) return ... } </code></pre> <p>This works fine. Also when the calls are nested, including inside the event itself.</p> <p>But the <code>CellValueChanged</code> event is now <strong>fired too many times for no reasons</strong>.</p> <p>Because I often have to cope with this pattern, I am looking for a solution that can be applicable generally for Events in UIs, not only the DataGridView.</p> <p>So my question is:</p> <p>What is the best tip to mask UI Events correctly and avoid unnecessary Events fires ?</p>
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    1. USLarry
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    1. COpossible duplicate of [Differentiating between events raised by user interaction and my own code](http://stackoverflow.com/questions/729897/differentiating-between-events-raised-by-user-interaction-and-my-own-code)
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      1. USDaniel A. White
    2. COSomething like [CellBeginEdit](http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridview.cellbeginedit(v=vs.110).aspx)?
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      1. USA. Rodas
    3. COThanks for the pointers. I'm sorry the linked question does unfortunately answer mine. I cannot use CellBeginEdit: it triggers immediately as the user starts to type in a cell.
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      1. USLarry
 

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