NumericUpDown not saving when Commit

Posted on 2014-01-20
Last Modified: 2014-01-21
Hi experts
I have a numericUpDown control bound to a bindingSource:
nupTest.DataBindings.Add("Value", bindingSource, "Parameter1", true, DataSourceUpdateMode.OnPropertyChanged);

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where the bindingSource was bound to an object:
bindingSource.DataSource = anObject

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When I typed value directly into the numericUpDown box and did commit edit, the value was not saved.

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In order to get it to be saved, I needed to first click off.
Please let me know what I need to do so that I don't need to do the click off.
Question by:dominicwong
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LVL 96

Expert Comment

by:Bob Learned
ID: 39798471
I would think that you need to call BindingSource.EndEdit, but I am not sure which event handler you would need to include that in (thinking...)

Author Comment

ID: 39798529
Thanks TheLearnedOne.
I called bindingSource.EndEdit before saving all the object values to a file. But the new value in the numericUpDown Control still didn't pass on the new value.
LVL 27

Expert Comment

ID: 39798895
This is because you bind "Value" property. According MSDN
For the ValueChanged event to occur, the Value property can be changed in code, by clicking the up or down button, or by the user entering a new value that is read by the control. The new value is read when the user hits the ENTER key or navigates away from the control. If the user enters a new value and then clicks the up or down button, the ValueChanged event will occur twice.
So, bind to Text property or assign Value in TextChanged event handler
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LVL 27

Expert Comment

ID: 39798943
Just found undocumented future (bug?) for numeric updown - adding dummy TextChange event handler which read Value property DOES fire valuecahenged event.
    Private Sub NumericUpDown1_ValueChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles NumericUpDown1.ValueChanged
        Debug.Print(String.Format("ValueChanged (Text = {0}, Value = {1})", NumericUpDown1.Text, NumericUpDown1.Value))
    End Sub
    'Private Sub NumericUpDown1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles NumericUpDown1.TextChanged
    '    Dim x = NumericUpDown1.Value
    'End Sub

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Run sampel with commented TextChanged handler and type in NumericUpDown - nothing printing in the debug window. Uncomment handler and type again - you'll see ValueChanged event fired! So just add dummy handler to your code"
Private Sub nupTest_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles nupTest.TextChanged
        Dim x = nupTest.Value
    End Sub

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and bindings will be updated as expected

Author Comment

ID: 39798990
Thanks Ark.
Probably because I am using C#, there is no TextChanged handler in NumericUpDown.
Please refer to screenshot.
LVL 27

Accepted Solution

Ark earned 500 total points
ID: 39799001
In VB it hidden from intellisense as well. Just add handler as is in code:

Author Closing Comment

ID: 39799014
Thanks Ark for your advice and prompt response. It works!!

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