WPF TextBox 验证输入

        //验证输入为数字

        private void txt_time_KeyDown(object sender, KeyEventArgs e)

        {

            if (!((e.Key >= Key.D0 && e.Key <= Key.D9) || (e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9)))

            {

                e.Handled = true;

            }

        }



        //屏蔽粘贴非法字符

        private void txt_time_TextChanged(object sender, TextChangedEventArgs e)

        {

            var 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 = textBox.Text.Remove(offset, change[0].AddedLength);

                    textBox.Select(offset, 0);

                }

            }

        }

 

 

        //屏蔽非法按键

        private void txtAge_KeyDown(object sender, KeyEventArgs e)

        {

            TextBox txt = sender as TextBox;



            if ((e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9) || 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.KeyboardDevice.Modifiers != ModifierKeys.Shift)

            {

                if (txt.Text.Contains(".") && e.Key == Key.OemPeriod)

                {

                    e.Handled = true;

                    return;

                }

                e.Handled = false;

            }

            else

            {

                e.Handled = true;

            }

        }



        //屏蔽中文输入和非法字符粘贴输入

        private void txtAge_TextChanged(object sender, TextChangedEventArgs e)

        {

            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 = textBox.Text.Remove(offset, change[0].AddedLength);

                    textBox.Select(offset, 0);

                }

            }

        }