c#自定义属性限制只能输入整数、小数的输入框

1.支持整数和小数两种输入方式 

2.可以通过VS的属性窗口，设置InputType属性来选择是哪种输入方式

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace UserController {
    public partial class IntegerInput : TextBox {

        public enum InputTypeEnum {
            IntegerType = 0, 
            DobuleType = 1
        }
        private InputTypeEnum inputType;
        public InputTypeEnum InputType {
            get { return inputType; }
            set { inputType = value; }
        }

        public IntegerInput() {
            InitializeComponent();
        }

        public IntegerInput(IContainer container) {
            container.Add(this);
            InitializeComponent();
        }

        protected override void OnKeyPress(KeyPressEventArgs e) {
            base.OnKeyPress(e);
            int kc = e.KeyChar;
            if (InputTypeEnum.IntegerType == InputType) {
                IntegerType(kc, e);
            } else {
                DobuleType(kc, e);
            }
        }

        private void IntegerType(int kc,KeyPressEventArgs e) {
            if (kc == (char)8 || (kc >= '0' && kc <= '9')) {
                e.Handled = false;
            } else {
                e.Handled = true;
            }
        }

        private void DobuleType(int kc, KeyPressEventArgs e) {
            if (kc == (char)8 || (kc >= '0' && kc <= '9')) {
                e.Handled = false;
            } else if (kc == 46) {
                if (this.Text.Length <= 0)
                    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(this.Text, out oldf);
                    b2 = float.TryParse(this.Text + e.KeyChar.ToString(), out f);
                    if (b2 == false) {
                        if (b1 == true)
                            e.Handled = true;
                        else
                            e.Handled = false;
                    }
                }
            } else {
                e.Handled = true;
            }
        }
    }
}

其中，小数输入代码借鉴网络