vb.net - DataGridView Handle OnHandleCreate Resetting Selected Rows -

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we have microsoft excel com addin creates taskpane user. based on "plug-in" user loads, taskpane populated corresponding usercontrol , displayed on screen.

these usercontrols typically involve use of datagridviews, , save rows user has selected, each time plug-in loaded, selected rows selected user.

however, have found in process of loading usercontrol onto taskpane, , making taskpane visible, several external code methods fire, reset selection of datagridview. below events:

system.windows.forms.dll!system.windows.forms.datagridview.onselectionchanged(system.eventargs e) + 0x88 bytes    system.windows.forms.dll!system.windows.forms.datagridview.flushselectionchanged    () + 0x37 bytes   system.windows.forms.dll!system.windows.forms.datagridview.clearselection(int columnindexexception, int rowindexexception, bool selectexceptionelement) + 0x304 bytes     system.windows.forms.dll!system.windows.forms.datagridview.setandselectcurrentcelladdress(int columnindex, int rowindex, bool setanchorcelladdress, bool        validatecurrentcell, bool throughmouseclick, bool clearselection, bool forcecurrentcellselection) + 0x60 bytes    system.windows.forms.dll!system.windows.forms.datagridview.makefirstdisplayedcellcurrentcell(bool includenewrow) + 0x88 bytes     system.windows.forms.dll!system.windows.forms.datagridview.onhandlecreated(system.eventargs e) + 0x3d bytes   system.windows.forms.dll!system.windows.forms.control.wmcreate(ref system.windows.forms.message m) + 0x43 bytes   system.windows.forms.dll!system.windows.forms.control.wndproc(ref system.windows.forms.message m) + 0x2ed bytes   system.windows.forms.dll!system.windows.forms.datagridview.wndproc(ref system.windows.forms.message m) + 0x10a bytes      system.windows.forms.dll!system.windows.forms.control.controlnativewindow.onmessage(ref system.windows.forms.message m) + 0x11 bytes      system.windows.forms.dll!system.windows.forms.control.controlnativewindow.wndproc(ref system.windows.forms.message m) + 0x39 bytes       system.windows.forms.dll!system.windows.forms.nativewindow.debuggablecallback(system.intptr hwnd, int msg, system.intptr wparam, system.intptr lparam) + 0x5e bytes

the actual code more complex , involves calls database, example, shows how create dgv , populate , select rows. below code follow initializecomponents() method in constructor of usercontrol:

dgvexample.rows.add("actuals")  dgvexample.rows.add("budget")  dgvexample.rows.add("forecast")  dgvexample.rows.add("ly actuals")   = 0 dgvexample.rows.count - 1     dgvexample.rows(i).selected = true  next

we not want move process of selecting rows after taskpane visible, because user see changes, , not clean end user. makes no sense instantiated dgv object selected rows not hold values once added taskpane.

as had diagnosed, handlecreated event clears selection, solution force handle created @ time of choosing before set selected items. can accomplished 1 of 3 methods:

  1. reference control handle. if not yet created, force done.
  2. call control.createhandle
  3. call control.createcontrol. create handle if control.visible property true.

@tntinmn - forcing creation of control worked. ... idea can cause delayed handle creation?

to answer refer source.

all handles in windows forms

when control create handle? (when control call createwindowex?) control tries as possible defer creating handle. because setting properties forces chatty interop between clr , user32.

typically handles controls created before form.load event called. handles can created if "handle" property called , handle has not yet been created, or createcontrol() called.


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