TextBox禁止复制粘贴和数字验证，小数验证，汉字验证

验证小数

#region 验证小数
        /// <summary>
        /// 验证小数
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void txtRoomArea_KeyDown_ForFloat(object sender, KeyEventArgs e)
        {
            TextBox txt = sender as TextBox;
            //屏蔽非法按键，只能输入小数
            if ((e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9) || e.Key == Key.Subtract || e.Key == Key.Decimal)
            {
                if (txt.Text.Contains(".") && e.Key == Key.Decimal)
                {
                    e.Handled = true;
                    return;
                }
                e.Handled = false;
            }
            else if (((e.Key >= Key.D0 && e.Key <= Key.D9) || e.Key == Key.OemPeriod || e.Key == Key.Subtract) && e.KeyboardDevice.Modifiers != ModifierKeys.Shift)
            {
                if (txt.Text.Contains(".") && e.Key == Key.OemPeriod)
                {
                    e.Handled = true;
                    return;
                }
                e.Handled = false;
            }
            else
            {
                e.Handled = true;
            }

        } 
        #endregion

TextBox内容改变的时候检测

  #region TextBox_TextChanged
        private void TextBox_TextChanged(object sender, TextChangedEventArgs e)
        {

            //屏蔽中文输入和粘贴输入
            TextBox textBox = sender as TextBox;
            TextChange[] change = new TextChange[e.Changes.Count];
            e.Changes.CopyTo(change, 0);

            int offset = change[0].Offset;
            if (change[0].AddedLength > 0)
            {
                double num = 0;
                if (!Double.TryParse(textBox.Text, out num) && !textBox.Text.Equals("-"))
                {
                    textBox.Text = textBox.Text.Remove(offset, change[0].AddedLength);
                    textBox.Select(offset, 0);
                }
            }
            //            NoteFieldConfigModel noteField = NoteFieldConfigs.First(t => t.FfieldName == textBox.Name);
            //            string value = string.IsNullOrEmpty(textBox.Text) == true ? null : textBox.Text;
            //            if(string.IsNullOrEmpty(value))
            //            {
            //                return;
            //            }
            //if (noteField.FfieldType == 3)
            //{
            //    textBox.Text = string.Format("{0:N2}", Convert.ToDouble(value.TrimStart(',')));
            //}
            //if (noteField.FfieldType == 2 && (noteField.FimptClassID == null || noteField.FimptClassID == 0))
            //{
            //    textBox.Text = string.Format("{0:N0}", Convert.ToDouble(value.TrimStart(',')));
            //}

        } 
        #endregion