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Asked: 2026-05-11T03:57:49+00:00

I have the same problem as described in the posts listed below. That is,

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I have the same problem as described in the posts listed below. That is, certain keys don’t work at all when I type them into my combobox until I first hit the spacebar. One of the keys is ‘.’, but another is the letter ‘Q’, and there are others: ‘$’, ‘%’.

http://forums.microsoft.com/msdn/ShowPost.aspx?PostID=659716&SiteID=1
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=2909173&SiteID=1&pageid=0
http://bytes.com/forum/thread548399.html

I’ve tried a lot of things so far. My latest failure was based on the theory that maybe the DataGridView was using WIN32 API wndproc subclassing to intercept messages, so I wrote logic to save the old wndproc and restore it after adding it to the DataGridView’s control collection. That didn’t work.

Messina – thanks for reminding me about Spy++. For the letter ‘A’, the edit window sends an EN_UPDATE to its combobox parent. But, not for the ‘Q’. That’s so strange.

I have convinced myself that the DataGridView is not subclassing the combo and the edit, because I check the address of the wndprocs just after creation and before adding them to the grid’s collection, and then later when I paint. Unless the grid installs some sort of global hooks..

I’m thinkin, maybe I can subclass the edit control, and then send the notification to the combobox the way I see the edit control doing here?

EDIT: More info here. Windows messages from grid, combobox, and edit control, from Spy++:

HWNDs: 122064e < grid 010d0674 < combobox 01360696 < combox’s edit control

<01402> 01360696 P WM_KEYDOWN nVirtKey:'A' cRepeat:1 ScanCode:1E fExtended:0 fAltDown:0 fRepeat:0 fUp:0 <01403> 010D0674 S WM_GETDLGCODE <01404> 010D0674 R WM_GETDLGCODE fuDlgCode:DLGC_WANTARROWS | DLGC_WANTCHARS <01405> 010D0674 S WM_GETDLGCODE <01406> 010D0674 R WM_GETDLGCODE fuDlgCode:DLGC_WANTARROWS | DLGC_WANTCHARS <01407> 010D0674 S WM_GETDLGCODE <01408> 010D0674 R WM_GETDLGCODE fuDlgCode:DLGC_WANTARROWS | DLGC_WANTCHARS <01409> 010D0674 S WM_GETDLGCODE <01410> 010D0674 R WM_GETDLGCODE fuDlgCode:DLGC_WANTARROWS | DLGC_WANTCHARS <01411> 01360696 P WM_CHAR chCharCode:'0061' (97) cRepeat:1 ScanCode:1E fExtended:0 fAltDown:0 fRepeat:0 fUp:0 <01412> 010D0674 S WM_GETDLGCODE <01413> 010D0674 R WM_GETDLGCODE fuDlgCode:DLGC_WANTARROWS | DLGC_WANTCHARS <01414> 010D0674 S WM_GETDLGCODE <01415> 010D0674 R WM_GETDLGCODE fuDlgCode:DLGC_WANTARROWS | DLGC_WANTCHARS  <01416> 010D0674 S WM_COMMAND wNotifyCode:EN_UPDATE wID:1001 hwndCtl:01360696  <<< edit control sends to combobox  <01417> 010D0674 S message:0x2111 [User-defined:WM_USER+7441] wParam:00060674 lParam:010D0674    What do these do? <01418> 010D0674 R message:0x2111 [User-defined:WM_USER+7441] lResult:00000000  <01419> 010D0674 R WM_COMMAND <01420> 010D0674 S WM_CTLCOLOREDIT hdcEdit:C7011AA6 hwndEdit:01360696 <01421> 010D0674 R WM_CTLCOLOREDIT hBrush:F0103EB0  <01422> 010D0674 S WM_COMMAND wNotifyCode:EN_CHANGE wID:1001 hwndCtl:01360696  << edit control sends to combobox  <01423> 010D0674 S message:0x2111 [User-defined:WM_USER+7441] wParam:00050674 lParam:010D0674  <01424> 0122064E S WM_PAINT hdc:00000000   <<< grid is told to paint <01425> 0122064E S WM_ERASEBKGND hdc:94011D4E <01426> 0122064E R WM_ERASEBKGND fErased:True <01427> 0122064E S WM_GETTEXTLENGTH <01428> 0122064E R WM_GETTEXTLENGTH cch:0 <01429> 0122064E S WM_GETTEXT cchTextMax:2 lpszText:0012D0C0 <01430> 0122064E R WM_GETTEXT cchCopied:0 lpszText:0012D0C0 ('') <01431> 0122064E S WM_GETTEXTLENGTH <01432> 0122064E R WM_GETTEXTLENGTH cch:0 <01433> 0122064E S WM_GETTEXT cchTextMax:2 lpszText:0012D0C0 <01434> 0122064E R WM_GETTEXT cchCopied:0 lpszText:0012D0C0 ('') <01435> 010D0674 S WM_WINDOWPOSCHANGING lpwp:0012D4B0 <01436> 010D0674 R WM_WINDOWPOSCHANGING <01437> 010D0674 S CB_GETCURSEL <01438> 010D0674 R CB_GETCURSEL index:CB_ERR <01439> 010D0674 S WM_GETTEXTLENGTH <01440> 01360696 S WM_GETTEXTLENGTH <01441> 01360696 R WM_GETTEXTLENGTH cch:2 <01442> 010D0674 R WM_GETTEXTLENGTH cch:2 <01443> 010D0674 S WM_GETTEXT cchTextMax:6 lpszText:0012CC44 <01444> 01360696 S WM_GETTEXT cchTextMax:6 lpszText:0012BE64 <01445> 01360696 R WM_GETTEXT cchCopied:2 lpszText:0012BE64 ('a') <01446> 010D0674 R WM_GETTEXT cchCopied:2 lpszText:0012CC44 ('a') <01447> 010D0674 S CB_GETCURSEL <01448> 010D0674 R CB_GETCURSEL index:CB_ERR <01449> 010D0674 S WM_GETTEXTLENGTH <01450> 01360696 S WM_GETTEXTLENGTH <01451> 01360696 R WM_GETTEXTLENGTH cch:2 <01452> 010D0674 R WM_GETTEXTLENGTH cch:2 <01453> 010D0674 S WM_GETTEXT cchTextMax:6 lpszText:0012CC44 <01454> 01360696 S WM_GETTEXT cchTextMax:6 lpszText:0012BE64 <01455> 01360696 R WM_GETTEXT cchCopied:2 lpszText:0012BE64 ('a') <01456> 010D0674 R WM_GETTEXT cchCopied:2 lpszText:0012CC44 ('a') <01457> 010D0674 S CB_GETCURSEL <01458> 010D0674 R CB_GETCURSEL index:CB_ERR <01531> 0122064E R WM_PAINT <01532> 010D0674 S WM_PAINT hdc:00000000 <01533> 010D0674 S WM_NCPAINT hrgn:00000001 <01534> 010D0674 R WM_NCPAINT <01535> 010D0674 S WM_ERASEBKGND hdc:0F0141ED <01536> 010D0674 R WM_ERASEBKGND fErased:True <01537> 0122064E S WM_CTLCOLOREDIT hdcEdit:840137F1 hwndEdit:010D0674 <01538> 0122064E R WM_CTLCOLOREDIT hBrush:F0103EB0 <01539> 010D0674 R WM_PAINT <01540> 01360696 S WM_PAINT hdc:00000000 <01541> 01360696 S WM_NCPAINT hrgn:00000001 <01542> 01360696 R WM_NCPAINT <01543> 01360696 S WM_ERASEBKGND hdc:C7011AA6 <01544> 01360696 R WM_ERASEBKGND fErased:True <01545> 010D0674 S WM_CTLCOLOREDIT hdcEdit:870137F1 hwndEdit:01360696 <01546> 010D0674 R WM_CTLCOLOREDIT hBrush:F0103EB0 <01547> 010D0674 S WM_CTLCOLOREDIT hdcEdit:870137F1 hwndEdit:01360696 <01548> 010D0674 R WM_CTLCOLOREDIT hBrush:F0103EB0 <01549> 01360696 R WM_PAINT <01555> 0122064E S WM_CTLCOLOREDIT hdcEdit:8A0137F1 hwndEdit:010306AC <01556> 0122064E R WM_CTLCOLOREDIT hBrush:78103C5B <01568> 010D0674 S CB_GETCURSEL <01569> 010D0674 R CB_GETCURSEL index:CB_ERR <01570> 010D0674 S WM_GETTEXTLENGTH <01571> 01360696 S WM_GETTEXTLENGTH <01572> 01360696 R WM_GETTEXTLENGTH cch:2 <01573> 010D0674 R WM_GETTEXTLENGTH cch:2 <01574> 010D0674 S WM_GETTEXT cchTextMax:6 lpszText:0012D7A4 <01575> 01360696 S WM_GETTEXT cchTextMax:6 lpszText:0012C9C4 <01576> 01360696 R WM_GETTEXT cchCopied:2 lpszText:0012C9C4 ('a') <01577> 010D0674 R WM_GETTEXT cchCopied:2 lpszText:0012D7A4 ('a') <01578> 010D0674 S CB_GETCURSEL <01579> 010D0674 R CB_GETCURSEL index:CB_ERR <01580> 010D0674 S WM_GETTEXTLENGTH <01581> 01360696 S WM_GETTEXTLENGTH <01582> 01360696 R WM_GETTEXTLENGTH cch:2 <01583> 010D0674 R WM_GETTEXTLENGTH cch:2 <01584> 010D0674 S WM_GETTEXT cchTextMax:6 lpszText:0012D6E0 <01585> 01360696 S WM_GETTEXT cchTextMax:6 lpszText:0012C900 <01586> 01360696 R WM_GETTEXT cchCopied:2 lpszText:0012C900 ('a') <01587> 010D0674 R WM_GETTEXT cchCopied:2 lpszText:0012D6E0 ('a') <01588> 010D0674 S CB_GETCURSEL <01589> 010D0674 R CB_GETCURSEL index:CB_ERR <01590> 010D0674 S WM_GETTEXTLENGTH <01591> 01360696 S WM_GETTEXTLENGTH <01592> 01360696 R WM_GETTEXTLENGTH cch:2 <01593> 010D0674 R WM_GETTEXTLENGTH cch:2 <01594> 010D0674 S WM_GETTEXT cchTextMax:6 lpszText:0012D6E0 <01595> 01360696 S WM_GETTEXT cchTextMax:6 lpszText:0012C900 <01596> 01360696 R WM_GETTEXT cchCopied:2 lpszText:0012C900 ('a') <01597> 010D0674 R WM_GETTEXT cchCopied:2 lpszText:0012D6E0 ('a') <01598> 010D0674 R message:0x2111 [User-defined:WM_USER+7441] lResult:00000000 <01599> 01360696 S WM_GETTEXTLENGTH <01600> 01360696 R WM_GETTEXTLENGTH cch:2 <01601> 01360696 S WM_GETTEXT cchTextMax:6 lpszText:0012DF8C <01602> 01360696 R WM_GETTEXT cchCopied:2 lpszText:0012DF8C ('a') <01603> 010D0674 R WM_COMMAND <01604> 01360696 P WM_KEYUP nVirtKey:'A' cRepeat:1 ScanCode:1E fExtended:0 fAltDown:0 fRepeat:1 fUp:1

Letter q

<01625> 01360696 P WM_KEYDOWN nVirtKey:'Q' cRepeat:1 ScanCode:10 fExtended:0 fAltDown:0 fRepeat:0 fUp:0 <01626> 010D0674 S WM_GETDLGCODE <01627> 010D0674 R WM_GETDLGCODE fuDlgCode:DLGC_WANTARROWS | DLGC_WANTCHARS <01628> 010D0674 S WM_GETDLGCODE <01629> 010D0674 R WM_GETDLGCODE fuDlgCode:DLGC_WANTARROWS | DLGC_WANTCHARS <01630> 010D0674 S WM_GETDLGCODE <01631> 010D0674 R WM_GETDLGCODE fuDlgCode:DLGC_WANTARROWS | DLGC_WANTCHARS <01632> 010D0674 S WM_GETDLGCODE <01633> 010D0674 R WM_GETDLGCODE fuDlgCode:DLGC_WANTARROWS | DLGC_WANTCHARS <01634> 01360696 P WM_CHAR chCharCode:'0071' (113) cRepeat:1 ScanCode:10 fExtended:0 fAltDown:0 fRepeat:0 fUp:0 <01635> 010D0674 S WM_GETDLGCODE <01636> 010D0674 R WM_GETDLGCODE fuDlgCode:DLGC_WANTARROWS | DLGC_WANTCHARS <01637> 010D0674 S WM_GETDLGCODE <01638> 010D0674 R WM_GETDLGCODE fuDlgCode:DLGC_WANTARROWS | DLGC_WANTCHARS <01640> 01360696 P WM_KEYUP nVirtKey:'Q' cRepeat:1 ScanCode:10 fExtended:0 fAltDown:0 fRepeat:1 fUp:1
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  1. By any chance, have you already solved your problem?

    I have the same problem as yours, my custom control for DataGridView cannot receive letter Q, period, dollar, single quote, percent, etc.

    I was able to solve the problem by changing the ‘switch .. default: return false’ to ‘switch .. default: return !dataGridViewWantsInputKey’

    I guess the pattern code from Microsoft for making your own usercontrol for datagridview is not optimal. This is the pattern code from Microsoft:

    http://msdn.microsoft.com/en-au/library/7tas5c80(vs.80).aspx

    public bool EditingControlWantsInputKey(     Keys key, bool dataGridViewWantsInputKey) {     // Let the DateTimePicker handle the keys listed.     switch (key & Keys.KeyCode)     {         case Keys.Left:         case Keys.Up:         case Keys.Down:         case Keys.Right:         case Keys.Home:         case Keys.End:         case Keys.PageDown:         case Keys.PageUp:             return true;         default:             return false; // I changed this to: return !dataGridViewWantsInputKey.  My usercontrol can now receive Q, period, dollar, etc.     } }
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