I have created a class that inherits from System.Windows.Forms.TextBox so I
can add some functionality like a date mask, validating numeric types, etc.
I have this block of code that handles MyBase.Enter and MyBase.GotFocus and
does some stuff when the type of the textbox is Date. Basically what this
code is attempting to do is format the text to a date format and then
select the character that was clicked on.
The problem is that even though I'm setting the text of the base class in
the Enter event the text is always String.Empty in the GotFocus event. I
initially tried placing all of the code in the Enter event, but didn't have
any success there so I moved the part that does the selection to the
GotFocus event hoping that would cause the TextBox to accept the text.
The interesting part is that after the events are complete the text is
finally displayed in the textbox so the TextBox base class is eventually
accepting the text sometime after the events have fired. I tried calling
Application.DoEvents(), but that didn't help.
Any idea as to how I can get the base TextBox class to accept the text at
the time I set it?
Here's the code:
Private Sub MyTextBox_Enter(ByVal sender As Object, ByVal e As
System.EventArgs) Handles MyBase.Enter
If m_enuType = TextBoxType.Date Then
If IsDate(MyBase.Text) Then
MyBase.Text = Format(CDate(MyBase.Text), "mm/dd/yyyy")
Else
MyBase.Text = " / / "
End If
End If
End Sub
Private Sub MyTextBox_GotFocus(ByVal sender As Object, ByVal e As
System.EventArgs) Handles MyBase.GotFocus
If m_enuType = TextBoxType.Date Then
' this event always fires after the MyBase.Enter event. However,
MyBase.Text is always String.Empty
' even though the Enter event handler always sets the text. What needs
to be done to make
' MyBase accept the text?
If MyBase.SelectionStart = 0 Or Mid(MyBase.Text, MyBase.SelectionStart
+ 1, 1) <> "/" Then
' select the next char
MyBase.Select(MyBase.SelectionStart, 1)
Else
' select the prev char
MyBase.Select(MyBase.SelectionStart - 1, 1)
End If
End If
End Sub
Thanks,
Roy
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