using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;
namespace WinMilkProject.Project
{
public partial class Form1 : Form
{
Thread myThread;
public int frequency = 0;//更新时间频率
public static bool isUse = false;//是否停止更新
public static string statusInfo = string.Empty;//状态
private delegate void myDelegate(DataTable dt);//定义委托
public Form1()
{
InitializeComponent();
label2.Text = "更新频率为:" + (trackBar1.Value / 1000).ToString() + "秒";
}
private void Form1_Load(object sender, EventArgs e)
{
myThread = new Thread(startFillDv);//实例化线程
myThread.Start();
}
private void startFillDv()
{
while (true)
{
if (isUse)
{
statusInfo = "正在实时更新数据......";
DataTable dt = CommonEx.GetDataTableEx("select * from table1");//自己写的数据封装类 能够返回一个datatable
Grid(dt);
Thread.Sleep(frequency);
}
else
{
statusInfo = "停止更新!";
}
}
}
private void Grid(DataTable dt)
{
if (this.InvokeRequired)
{
this.Invoke(new myDelegate(Grid), new object[] { dt });
}
else
{
try
{
this.dataGridView1.DataSource = null;
this.dataGridView1.DataSource = dt;
dt = null;
statusInfo = "更新完成!";
}
catch
{
}
}
}
private void Form1_FormClosed(object sender, FormClosedEventArgs e)
{
if (this.myThread.IsAlive)
{
this.myThread.Abort();//结束线程
}
}
private void timer1_Tick(object sender, EventArgs e)
{
label1.Text = statusInfo;
frequency = trackBar1.Value;
if (statusInfo.Trim() == "正在实时更新数据......")
{
pictureBox1.Visible = true;
}
else
{
pictureBox1.Visible = false;
}
}
private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
if (checkBox1.Checked)
{
isUse = true;
}
else
{
isUse = false;
}
}
private void trackBar1_Scroll(object sender, EventArgs e)
{
label2.Text = "更新频率为:" + (trackBar1.Value / 1000).ToString() + "秒";
}
}
}
