#region 设置数量等textbox控件样式及限制条件（具体调用的方法就是重写或直接调用ShieldNumberTextBoxOtherKeys函数）

         /// <summary>

         /// 屏蔽数字textbox的其他字符串

         /// </summary>

         /// <param name="sender"></param>

         /// <param name="e"></param>

         public virtual void tBoxNumbers_KeyDown(object sender, KeyEventArgs e)

         {

             e.SuppressKeyPress = true;

             switch (e.KeyCode)

             {

                 case Keys.D0:

                 case Keys.D1:

                 case Keys.D2:

                 case Keys.D3:

                 case Keys.D4:

                 case Keys.D5:

                 case Keys.D6:

                 case Keys.D7:

                 case Keys.D8:

                 case Keys.D9:

                 case Keys.NumPad0:

                 case Keys.NumPad1:

                 case Keys.NumPad2:

                 case Keys.NumPad3:

                 case Keys.NumPad4:

                 case Keys.NumPad5:

                 case Keys.NumPad6:

                 case Keys.NumPad7:

                 case Keys.NumPad8:

                 case Keys.NumPad9:

                 case Keys.Back:

                 case Keys.OemPeriod:

                 case Keys.Delete:

                 case Keys.Decimal:

                     e.SuppressKeyPress = false;

                     break;

                 default:

                     break;

             }

         }

         public virtual void tBoxNumbers_KeyPress(object sender, KeyPressEventArgs e)

         {

             TextBox tBox = sender as TextBox;

             char c = e.KeyChar;

             if (c.ToString().Equals("."))

             {

                 if (tBox.Text.Length <= )

                     e.Handled = true;           //小数点不能在第一位

                 else

                 {

                     float f;

                     float oldf;

                     bool b1 = false, b2 = false;

                     b1 = float.TryParse(tBox.Text, out oldf);

                     b2 = float.TryParse(tBox.Text + e.KeyChar.ToString(), out f);

                     if (b2 == false)

                     {

                         if (b1 == true)

                             e.Handled = true;

                         else

                             e.Handled = false;

                     }

                 }

             }

         }

         /// <summary>

         /// 屏蔽数字textbox的其他字符串

         /// </summary>

         /// <param name="tbox">要屏蔽的textbox</param>

         public virtual void ShieldNumberTextBoxOtherKeys(TextBox tbox)

         {

             tbox.ImeMode = ImeMode.Disable;

             tbox.KeyDown += tBoxNumbers_KeyDown;

             tbox.KeyPress += tBoxNumbers_KeyPress;

         }

         #endregion