form1.cs

Visual C#2005程序设计教程

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WinAppTest02
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnDateTime_Click(object sender, EventArgs e)
        {
            lblInfo.Text = "日期与时间方法及属性使用示例：";
            lblInfo.Text += "\n获取当前日期字符串DateTime.Now.ToLongDateString( )：\n" 
                + DateTime.Now.ToLongDateString();
            lblInfo.Text += "\n获取当前时间字符串DateTime.Now.ToLongTimeString( )：\n"
                + DateTime.Now.ToLongTimeString();
            lblInfo.Text += "\n获取当前日期字符串(2)DateTime.Now.ToShortDateString( )：\n"
                + DateTime.Now.ToShortDateString();
            lblInfo.Text += "\n获取当前时间字符串(2)DateTime.Now.ToShortTimeString( )：\n"
                + DateTime.Now.ToShortTimeString();
            /* 
            lblInfo.Text += "\n获取当前年份DateTime.Now.Year："
                + DateTime.Now.Year;
            lblInfo.Text += "\n获取当前小时DateTime.Now.Hour："
                + DateTime.Now.Hour;*/
            lblInfo.Text += "\n当前为星期几DateTime.Now.DayOfWeek："
                + DateTime.Now.DayOfWeek;
            lblInfo.Text += "\n当前为一年中的第几天DateTime.Now.DayOfYear："
                + DateTime.Now.DayOfYear;
            lblInfo.Text += "\n增减天数后的日期DateTime.Now.AddDays(1.5)："
                + DateTime.Now.AddDays(1.5);
            /* 
            lblInfo.Text += "\n增减天数后的日期DateTime.Now.AddDays(-1.5)："
                + DateTime.Now.AddDays(-1.5);*/
        }

        private void btnMath_Click(object sender, EventArgs e)
        {
            lblInfo.Text = "数学方法及字段使用示例：";
            lblInfo.Text += "\n字段，圆周率Math.PI："
                + Math.PI;
            lblInfo.Text += "\n求绝对值方法Math.Abs(-38.5)："
                + Math.Abs(-38.5);
            lblInfo.Text += "\n求正弦值方法（30度）Math.Sin(Math.PI/6)："
                + Math.Sin(Math.PI / 6);
            lblInfo.Text += "\n求余弦值方法（60度）Math.Cos(Math.PI/3)："
                + Math.Cos(Math.PI / 3);
            lblInfo.Text += "\n求正切值方法（45度）Math.Tan(Math.PI/4)："
                + Math.Tan(Math.PI / 4);
            lblInfo.Text += "\n求最大值方法Math.Max(3,2)："
                + Math.Max(3, 2);
            lblInfo.Text += "\n求最小值方法Math.Min(3,2)："
                + Math.Min(3, 2);
            lblInfo.Text += "\n求幂方法（3的平方）Math.Pow(3,2)："
                + Math.Pow(3, 2);
            lblInfo.Text += "\n求保留小数值方法Math.Round(3.54)："
                + Math.Round(3.54);
            lblInfo.Text += "\n求保留小数值方法（2）Math.Round(3.1415926,3)："
                + Math.Round(3.1415926, 3);
            lblInfo.Text += "\n求平方根方法（2的平方根）Math.Sqrt(2)："
                + Math.Sqrt(2);
        }

        private void btnString_Click(object sender, EventArgs e)
        {
            lblInfo.Text = "字符串方法及属性使用示例：";
            lblInfo.Text += "\n查找指定子串在字符串中的位置\"abCDeFg\".IndexOf(\"b\",0)："
                + "abCDeFg".IndexOf("b", 0);
            lblInfo.Text += "\n在指定位置插入子串\"abCDeFg\".Insert(3,\"hij\")："
                + "abCDeFg".Insert(3, "hij");
            lblInfo.Text += "\n指定子串最后一次出现的位置\"abCDeFg\".LastIndexOf(\"F\"))："
                + "abCDeFg".LastIndexOf("F");
            lblInfo.Text += "\n字符串中的字符数\"abCDeFg\".Length："
                + "abCDeFg".Length;
            lblInfo.Text += "\n移除子串\"abCDeFg\".Remove(3,2)："
                + "abCDeFg".Remove(3, 2);
            lblInfo.Text += "\n替换子串\"abCDeFg\".Replace(\"eFg\",\"hij\")："
                + "abCDeFg".Replace("eFg","hij");
            lblInfo.Text += "\n截取子串\"abCDeFg\".Substring(3,4)："
                + "abCDeFg".Substring(3, 4);
            lblInfo.Text += "\n字符串转小写\"abCDeFg\".ToLower( )："
                + "abCDeFg".ToLower();
            lblInfo.Text += "\n字符串转大写\"abCDeFg\".ToUpper( )："
                + "abCDeFg".ToUpper();
        }

        private void btnRandom_Click(object sender, EventArgs e)
        {
            Random rn = new Random();
            lblInfo.Text = "随机数方法使用示例（假设随机对象为rn)：";
            lblInfo.Text += "\n产生随机整数rn.Next( )："
                + rn.Next();
            lblInfo.Text += "\n产生0～100之间的随机整数rn.Next(100)："
                + rn.Next(100);
            lblInfo.Text += "\n产生-100～100之间的随机整数rn.Next(-100, 100)："
                + rn.Next(-100, 100);
            lblInfo.Text += "\n产生0.0～1.0之间的随机实数rn.NextDouble( )："
                + rn.NextDouble();
        }
    }
}