[WinForm]TextBox只能输入数字或者正浮点型数字

关键代码：

        /// <summary>

        /// 只能输入数字【KeyPress事件】

        /// </summary>

        /// <param name="textBox">TextBox</param>

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

        public static void OnlyInputNumber(this TextBox textBox, KeyPressEventArgs e)

        {

            if (e.KeyChar != 8 && !Char.IsDigit(e.KeyChar))

            {

                e.Handled = true;

            }

        }

        /// <summary>

        /// 只能输入正浮点型数字【KeyPress事件】

        /// </summary>

        /// <param name="textBox">TextBox</param>

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

        public static void OnlyInputFloat(this TextBox textBox, KeyPressEventArgs e)

        {

            TextBox _curTextBox = textBox;

            if (e.KeyChar == 46)

            {

                if (_curTextBox.Text.Length <= 0)

                {

                    e.Handled = true;

                }

                else

                {

                    string _txtValue = _curTextBox.Text.Trim();

                    float _newValue, _oldValue;

                    bool _oldResult = false, _newResult = false;

                    _oldResult = float.TryParse(_txtValue, out _oldValue);

                    _newResult = float.TryParse(_txtValue + e.KeyChar.ToString(), out _newValue);

                    if (!_newResult)

                    {

                        if (_oldResult)

                            e.Handled = true;

                        else

                            e.Handled = false;

                    }

                }

            }

        }

代码使用：

        private void txtNumber_KeyPress(object sender, KeyPressEventArgs e)

        {

            TextBox _curTextBox = sender as TextBox;

            _curTextBox.OnlyInputNumber(e);

        }

        private void txtPrice_KeyPress(object sender, KeyPressEventArgs e)

        {

            TextBox _curTextBox = sender as TextBox;

            _curTextBox.OnlyInputFloat(e);

        }

希望有所帮助！