自定义数字控件方法

 private void NoTextBox_KeyPress(object sender, KeyPressEventArgs e)

        {

            char kc = e.KeyChar;

            if ((kc < 48 || kc > 57) && kc != 8 && kc != 46)

            {

                e.Handled = true;

            }

            if (kc == 8)

            {

                e.Handled = false;

            }

            else

            {

                e.Handled = !IsNumeric(this.NoTextBox, e.KeyChar.ToString());

            }

        }

        /// <summary>

        /// 数値パターン

        /// </summary>

        private readonly Regex numericPattern = new Regex("^([0-9])*$");

        /// <summary>

        /// 数値（整数型）

        /// </summary>

        private readonly Regex integerPattern = new Regex(@"^\d+$");

        /// <summary>

        /// 数値（小数型）

        /// </summary>

        private readonly Regex floatPattern = new Regex(@"^[+-]?\d*[.]?\d*$");

        /// <summary>

        /// 数値（符号なし小数型）

        /// </summary>

        private readonly Regex unsignedFloatPattern = new Regex(@"^\d*[.]?\d*$");

        /// <summary>

        /// 数値の型

        /// </summary>

        public enum NumericMode

        {

            /// <summary>

            /// 数値

            /// </summary>

            Numeric = 0,

            /// <summary>

            /// 整数型

            /// </summary>

            Integer = 1,

            /// <summary>

            /// 小数型

            /// </summary>

            Float = 2,

            /// <summary>

            /// 符号なし小数型

            /// </summary>

            UnsignedFloat = 3

        }

        private bool IsNumeric(TextBox txtBox, string value, NumericMode NumericType = NumericMode.Numeric, int DecimalPlaces = 0)

        {

            if (value.Length == 0)

            {

                return true;

            }

            bool result = true;

            switch (NumericType)

            {

                case NumericMode.Numeric:

                    result = numericPattern.IsMatch(value);

                    break;

                case NumericMode.Integer:

                    result = integerPattern.IsMatch(value);

                    if (result)

                    {

                        if ("0".Equals(txtBox.Text))

                        {

                            txtBox.Text = string.Empty;

                        }

                    }

                    break;

                case NumericMode.Float:

                    result = floatPattern.IsMatch(value);

                    if (result && DecimalPlaces == 0 && ".".Equals(value))

                    {

                        result = false;

                    }

                    if (result && txtBox.Text.Contains("."))

                    {

                        string[] arrInputValue = txtBox.Text.Split('.');

                        if (arrInputValue.Length == 2

                            && arrInputValue[1].Length >= DecimalPlaces)

                        {

                            result = false;

                        }

                    }

                    if (result)

                    {

                        if ("0".Equals(txtBox.Text) && !".".Equals(value))

                        {

                            txtBox.Text = string.Empty;

                        }

                    }

                    break;

                case NumericMode.UnsignedFloat:

                    result = unsignedFloatPattern.IsMatch(value);

                    if (result && DecimalPlaces == 0 && ".".Equals(value))

                    {

                        result = false;

                    }

                    if (result && txtBox.Text.Contains("."))

                    {

                        string[] arrInputValue = txtBox.Text.Split('.');

                        if (arrInputValue.Length == 2

                            && arrInputValue[1].Length >= DecimalPlaces)

                        {

                            result = false;

                        }

                    }

                    if (result)

                    {

                        if ("0".Equals(txtBox.Text) && !".".Equals(value))

                        {

                            txtBox.Text = string.Empty;

                        }

                    }

                    break;

            }

            return result;

        }