C#实现修改系统时间的方法

本文所述c#获取和修改系统时间的实现步骤为：系统的时间从 systemtime 结构体中取出，并显示在textbox1上，从setdate,settime控件中获取年，月，日，小时，分钟，秒信息，存入systemtime结构体中，然后使用setlocaltime(ref systemtime)设置为用户指定的时间。本代码编译后会有一个易于操作的窗体。

完整功能代码如下：

using system;
using system.drawing;
using system.collections;
using system.componentmodel;
using system.windows.forms;
using system.data;
using system.runtime.interopservices;
namespace changesystime
{
 /// <summary>
 /// form1 的摘要说明。
 /// </summary>
 public class form1 : system.windows.forms.form
 {
 private system.windows.forms.groupbox groupbox1;
 private system.windows.forms.textbox textbox1;
 private system.windows.forms.groupbox groupbox2;
 private system.windows.forms.button button1;
 private system.windows.forms.button button2;
 private system.timers.timer timer1;
 private system.windows.forms.datetimepicker setdate;
 private system.windows.forms.datetimepicker settime;
 private system.componentmodel.icontainer components;
 [structlayout(layoutkind.sequential)]
 public struct systemtime
 {
  public ushort wyear;
  public ushort wmonth;
  public ushort wdayofweek;
  public ushort wday;
  public ushort whour;
  public ushort wminute;
  public ushort wsecond;
  public ushort wmiliseconds;
 }
 
 // 用于设置系统时间
 [dllimport("kernel32.dll")]
 public static extern bool setlocaltime( ref systemtime systime );
 // 用于获得系统时间
 [dllimport("kernel32.dll")]
 public static extern void getlocaltime(ref systemtime systime);
 public form1()
 {
  //
  // windows 窗体设计器支持所必需的
  //
  initializecomponent();

  //
  // todo: 在 initializecomponent 调用后添加任何构造函数代码
  //
 }

 /// <summary>
 /// 清理所有正在使用的资源。
 /// </summary>
 protected override void dispose( bool disposing )
 {
  if( disposing )
  {
  if (components != null) 
  {
   components.dispose();
  }
  }
  base.dispose( disposing );
 }

 #region windows 窗体设计器生成的代码
 /// <summary>
 /// 设计器支持所需的方法 - 不要使用代码编辑器修改
 /// 此方法的内容。
 /// </summary>
 private void initializecomponent()
 {
  this.groupbox1 = new system.windows.forms.groupbox();
  this.textbox1 = new system.windows.forms.textbox();
  this.groupbox2 = new system.windows.forms.groupbox();
  this.settime = new system.windows.forms.datetimepicker();
  this.setdate = new system.windows.forms.datetimepicker();
  this.button1 = new system.windows.forms.button();
  this.button2 = new system.windows.forms.button();
  this.timer1 = new system.timers.timer();
  this.groupbox1.suspendlayout();
  this.groupbox2.suspendlayout();
  ((system.componentmodel.isupportinitialize)(this.timer1)).begininit();
  this.suspendlayout();
  // 
  // groupbox1
  // 
  this.groupbox1.controls.add(this.textbox1);
  this.groupbox1.location = new system.drawing.point(32, 24);
  this.groupbox1.name = "groupbox1";
  this.groupbox1.size = new system.drawing.size(216, 64);
  this.groupbox1.tabindex = 0;
  this.groupbox1.tabstop = false;
  this.groupbox1.text = "系统当前时间";
  // 
  // textbox1
  // 
  this.textbox1.location = new system.drawing.point(16, 24);
  this.textbox1.name = "textbox1";
  this.textbox1.readonly = true;
  this.textbox1.size = new system.drawing.size(184, 21);
  this.textbox1.tabindex = 1;
  this.textbox1.text = "";
  // 
  // groupbox2
  // 
  this.groupbox2.controls.add(this.settime);
  this.groupbox2.controls.add(this.setdate);
  this.groupbox2.location = new system.drawing.point(32, 112);
  this.groupbox2.name = "groupbox2";
  this.groupbox2.size = new system.drawing.size(216, 64);
  this.groupbox2.tabindex = 1;
  this.groupbox2.tabstop = false;
  this.groupbox2.text = "时间设置为";
  // 
  // settime
  // 
  this.settime.format = system.windows.forms.datetimepickerformat.time;
  this.settime.location = new system.drawing.point(128, 24);
  this.settime.name = "settime";
  this.settime.showupdown = true;
  this.settime.size = new system.drawing.size(72, 21);
  this.settime.tabindex = 1;
  this.settime.tabstop = false;
  // 
  // setdate
  // 
  this.setdate.format = system.windows.forms.datetimepickerformat.short;
  this.setdate.location = new system.drawing.point(8, 24);
  this.setdate.name = "setdate";
  this.setdate.size = new system.drawing.size(104, 21);
  this.setdate.tabindex = 0;
  // 
  // button1
  // 
  this.button1.location = new system.drawing.point(40, 200);
  this.button1.name = "button1";
  this.button1.size = new system.drawing.size(64, 32);
  this.button1.tabindex = 2;
  this.button1.text = "设置";
  this.button1.click += new system.eventhandler(this.button1_click);
  // 
  // button2
  // 
  this.button2.location = new system.drawing.point(168, 200);
  this.button2.name = "button2";
  this.button2.size = new system.drawing.size(64, 32);
  this.button2.tabindex = 3;
  this.button2.text = "退出";
  this.button2.click += new system.eventhandler(this.button2_click);
  // 
  // timer1
  // 
  this.timer1.enabled = true;
  this.timer1.synchronizingobject = this;
  this.timer1.elapsed += new system.timers.elapsedeventhandler(this.timer1_elapsed);
  // 
  // form1
  // 
  this.autoscalebasesize = new system.drawing.size(6, 14);
  this.clientsize = new system.drawing.size(280, 261);
  this.controls.add(this.button2);
  this.controls.add(this.button1);
  this.controls.add(this.groupbox2);
  this.controls.add(this.groupbox1);
  this.name = "form1";
  this.text = "获取和设置系统时间";
  this.groupbox1.resumelayout(false);
  this.groupbox2.resumelayout(false);
  ((system.componentmodel.isupportinitialize)(this.timer1)).endinit();
  this.resumelayout(false);

 }
 #endregion
 /// <summary>
 /// 应用程序的主入口点。
 /// </summary>
 [stathread]
 static void main() 
 {
  application.run(new form1());
 }

 private void button2_click(object sender, system.eventargs e)
 {
  this.close(); // 关闭当前窗体
 }

 private void timer1_elapsed(object sender, system.timers.elapsedeventargs e)
 {
  // 清除textbox1上的字符串
  textbox1.clear();
  // 创建systemtime结构体，用于接收系统当前时间
  systemtime systemtime = new systemtime();
  getlocaltime(ref systemtime); // 获得系统的时间并存在systemtime结构体中
  // 将系统的时间从 systemtime 结构体中中取出，并显示在textbox1上
  textbox1.text += systemtime.wyear.tostring() +"-";
  textbox1.text += systemtime.wmonth.tostring() + "-";
  textbox1.text += systemtime.wday.tostring() + " ";
  textbox1.text += systemtime.whour.tostring() + ":";
  textbox1.text += systemtime.wminute.tostring() + ":";
  textbox1.text += systemtime.wsecond.tostring();
 // textbox1.refresh(); 
 }
 private void button1_click(object sender, system.eventargs e)
 {
  // 创建systemtime结构体，用于接收用户设置的时间
  systemtime systemtime = new systemtime();
  // 从setdate,settime控件中获取年，月，日，小时，分钟，秒信息，存入systemtime结构体中
      systemtime.wyear = (ushort)setdate.value.year;
  systemtime.wmonth = (ushort)setdate.value.month;
  systemtime.wday = (ushort)setdate.value.day;
  systemtime.whour = (ushort)settime.value.hour;
  systemtime.wminute = (ushort)settime.value.minute;
  systemtime.wsecond = (ushort)settime.value.second;
  // 将系统的时间设置为用户指定的时间
  setlocaltime(ref systemtime);
 }
 }
}