c# - How to detect shift+tab when overriding ProcessCmdKey -


so had override processcmdkey in order detect tab pressing in winform. see this question context. successful in fixing tabbing issue had realize need check shift+tab logic allow user go backwards. can't seem figure out. below of have tried , hasn't worked far.

    private bool istab = false;     private bool isshifttab = false;     private  stringbuilder shifttab = new stringbuilder();      protected override bool processcmdkey(ref message msg, keys keydata)     {          if (keydata == keys.tab)         {             istab = true;             shifttab.append("tab");         }         else         {             istab = false;         }          if (keydata == keys.shift)         {             shifttab.append("shift");         }          if (shifttab.tostring() == "tabshift" || shifttab.tostring() == "shifttab")         {             isshifttab = true;          }          if ((control.modifierkeys & keys.tab) != 0)         {            //code         }          return base.processcmdkey(ref msg, keydata);     }

i think have combine 2 keys so:

if (keydata == (keys.shift | keys.tab)) isshifttab = true;

which can use skip tab override.


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