TxtRL.cs

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using System;
using System.Drawing;
using System.Windows.Forms;

namespace TxtRL
{
    /// <summary>
    /// 下载于51aspx.com
    /// </summary>
    public partial class TxtRL : TextBox
    {
        public TxtRL()
        {
            InitializeComponent();
            this.Click += new EventHandler(TextRL_Click);
            this.KeyPress += new KeyPressEventHandler(TextRL_KeyPress);
        }
        private RL rl = new RL();
        protected Point p;//鼠标位置
        /// <summary>
        /// 获取焦点则展示日历
        /// </summary>
        private void TextRL_Click(object sender, EventArgs e)
        {
            rl.txtRQ = this;
            rl.Show();
        }
        /// <summary>
        /// 只能输入数字
        /// </summary>
        private void TextRL_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar != 8 && !char.IsDigit(e.KeyChar))//判断输入是否为数字
            {
                e.Handled = true;//已经处理此事件
            }
            else if (e.KeyChar != 8)
            {
                #region 日期格式控制 YYYY-MM-DD
                string val = this.Text;
                int len = val.Length;
                if (len == 4 || len == 7)
                {
                    val += "-";
                    if (len == 4 && e.KeyChar > 49)//月份十分位大于1
                    {
                        val += "0";
                    }
                    else if (len == 7)
                    {
                        if (e.KeyChar > 51)//日期十分位大于3
                        {
                            val += "0";
                        }
                        else if (e.KeyChar == 51 && val.Substring(5, 2) == "02")
                        {
                            val += "0";
                        }
                    }
                }