private void textBoxX6_KeyPress(object sender, KeyPressEventArgs e){{//数字0~9所对应的keychar为48~57，小数点是46，Backspace是8  e.Handled = true;//输入0-9和Backspace del 有效  if ((e.KeyChar >= 47 && e.KeyChar <= 58) || e.KeyChar == 8){e.Handled = false;}if (e.KeyChar == 46)                       //小数点        {if (textBoxX6.Text.Length <= 0)e.Handled = true;           //小数点不能在第一位        else{float f;if (float.TryParse(textBoxX6.Text + e.KeyChar.ToString(), out f)){e.Handled = false;}}}}

private void textbox1_KeyPress(object sender, KeyPressEventArgs e){// 允许输入:数字、退格键(8)、全选(1)、复制(3)、粘贴(22)if (!Char.IsDigit(e.KeyChar) && e.KeyChar != 8 &&e.KeyChar != 1 && e.KeyChar != 3 && e.KeyChar != 22){e.Handled = true;}}

ESC  27           7  55
SPACE 32        8  56
! 33                 9  57
" 34                 :  58
# 35                ;  59
$ 36                <  60
%  37              =  61
& 38                >  62
' 39                  ?  63
( 40                 @  64
) 41                 A  65
* 42                B  66
+ 43                C  67
'  44                 D  68
- 45                 E  69
. 46                 F  70
/ 47                 G  71
0  48               H  72
1 49                I  73
2 50                J  74
3  51                  K  75
4  52                  L  76
5 53                  M  77
6  54                  N  78
O  79                   g  103
P  80                   h  104
Q  81                  i  105
R  82                  j  106
S  83                  k  107
T  84                  l  108
U  85                  m  109
V  86                  n  110
W  87                  o  111
X  88                  p  112
Y  89                  q  113
Z  90                  r  114
[  91                  s  115
\  92                  t  116
]  93                  u  117
^  94                  v  118
_  95                  w  119
`  96                  x  120
a  97                  y  121
b  98                  z  122
c  99                  {  123
d  100                  |  124
e  101                  }  125
f  102                  ~  126

   this.dGV.EditingControlShowing += new DataGridViewEditingControlShowingEventHandler(dGV_EditingControlShowing);}void dGV_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e){if (this.dGV.CurrentCell.ColumnIndex == 4){e.Control.KeyPress -= new KeyPressEventHandler(TextBoxDec_KeyPress);e.Control.KeyPress += new KeyPressEventHandler(TextBoxDec_KeyPress);}}private void TextBoxDec_KeyPress(object sender, KeyPressEventArgs e){if (this.dGV.CurrentCell.ColumnIndex ==4){if (e.KeyChar != 8 && !Char.IsDigit(e.KeyChar) && e.KeyChar != '.'){e.Handled = true;}}}