使用timer, 屏幕闪烁得厉害，求解决方法.

Question

请教一个问题：用c#编了一个winforms 窗体，在窗体中加入 timer 定时器，执行循环发送命令，现在的问题是屏幕闪烁得厉害！不知道怎么解决？求救

Answer 1

timer 发送了什么使得屏幕闪动。

Answer 2

要不用线程控制..不要用timertimer也是线程+委托实现的..自己写个线程类控制更灵活

Answer 3

Interval值调高
只要不是实时系统，把Interval调到1000是基本感觉不到的~

Answer 4

timer 发送了什么使得屏幕闪动。...
如果你做动画或者游戏可以看看下面我的代码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;
using System.Reflection;
using System.IO;
namespace DeskToolBar.Common
{
    class Clock
    {
        Graphics g;
        Control p;
        Image backGround;
        Image secHand;
        Image minHand;
        Image houHand;
        Thread thr;
        public Clock()
        {
         
            backGround =Resource1.BackGround; //Image.FromFile(Setting.Clock.ClockBackGround);
            secHand = Resource1.SecoundHand; //Image.FromFile(Setting.Clock.SecoundHand );
            minHand = Resource1.MinutHand; //Image.FromFile(Setting.Clock.MinuteHand );
            houHand = Resource1.HourHand;// Image.FromFile(Setting.Clock.HourHand);
            thr = new Thread(new ThreadStart(Draw));
        }
        public Graphics SetGraphic
        {
            set
            {
                g = value;
            }
        }
        public Control SetPanel
        {
            set
            {
                p = value;
                p.Width = backGround.Width;
                p.Height  = backGround.Height;
            }
        }
        public void Dispose()
        {
            thr.Abort ();
        }
        public void BeginDraw()
        {
            thr.Start();
        }
        void Draw()
        {
            if (p != null && g != null)
            {
                int totalTime = 0;
                int secCount = DateTime.Now.Second ;
                int minCount = DateTime.Now.Minute ;
                int hourCount = ((DateTime.Now.Hour));
                do
                {                    int timeSpan =1000;
                                       Point center = new Point(p.Width / 2, p.Height / 2);
                    Graphics buffer ;
                    //背景
                    Bitmap backGroundBit = new Bitmap(p.Width, p.Height);
                    buffer = Graphics.FromImage(backGroundBit);
                    buffer.Clear(Setting.Clock.MakeTransparentColor);
                    buffer.DrawImage(backGround, new Rectangle(center.X - backGround.Width / 2, center.Y - backGround.Height / 2, backGround.Width, backGround.Height), new Rectangle(0, 0, backGround.Width, backGround.Height), GraphicsUnit.Pixel);
                    //backGroundBit.MakeTransparent(Setting.Clock.MakeTransparentColor);
                    buffer.Dispose();
                    
            
                    
                    //时针
                    Bitmap houHandBit = new Bitmap(p.Width, p.Height);
                    buffer = Graphics.FromImage(houHandBit);
                    buffer.TranslateTransform(center.X, center.Y);
                    buffer.RotateTransform((float)hourCount * 360f / 24f +90 );
                    buffer.TranslateTransform(0, -10);
                    buffer.DrawImage(houHand, 0 ,0);
                    //houHandBit.MakeTransparent(Setting.Clock.MakeTransparentColor);
                    buffer.Dispose();
                    //分针
                    Bitmap minHandBit = new Bitmap(p.Width, p.Height);
                    buffer = Graphics.FromImage(minHandBit);
                    buffer.TranslateTransform(center.X, center.Y);
                    buffer.RotateTransform((float)minCount * 6+180  );
                    buffer.TranslateTransform(0, -10);
                    buffer.DrawImage(minHand, 0,0 );
                    //minHandBit.MakeTransparent(Setting.Clock.MakeTransparentColor);
                    buffer.Dispose();
                    //秒针
                    Bitmap secHandBit = new Bitmap(p.Width, p.Height);
                    buffer = Graphics.FromImage(secHandBit);
                    buffer.TranslateTransform(center.X, center.Y);
                    buffer.RotateTransform(((float)secCount) * 6 +180 );
                    buffer.TranslateTransform(0,  -10);
                    buffer.DrawImage(secHand, 0, 0 );                   
                    //secHandBit.MakeTransparent(Setting.Clock.MakeTransparentColor);
                    buffer.Dispose();
                                     
                    
                    //输出时间
    
                    Font font = new Font("Arial", 12, FontStyle.Bold);
                    SizeF size = g.MeasureString(DateTime.Now.ToLongTimeString(), font);
                    Bitmap wordsBit = new Bitmap((int)size.Width+1, (int)size.Height+1);
                    buffer = Graphics.FromImage(wordsBit);
                    SolidBrush brush;
                    //brush = new SolidBrush(Color.White);
                    //buffer.DrawString(DateTime.Now.ToLongTimeString(), font, brush, new PointF(0, 0));                    brush = new SolidBrush(Color.Pink);
                    buffer.DrawString(DateTime.Now.ToLongTimeString(), font, brush, new PointF(1, 1));                    //合成
                    g.DrawImage(backGroundBit, new Point(0, 0));
                    g.DrawImage(houHandBit, new Point(0, 0));
                    g.DrawImage(minHandBit, new Point(0, 0));
                    g.DrawImage(secHandBit, new Point(0, 0));
                    g.DrawImage(wordsBit, new PointF(center.X - size.Width / 2, center.Y + 12));
                    wordsBit.Dispose();
                    backGroundBit.Dispose();
                    secHandBit.Dispose();
                    minHandBit.Dispose();
                    houHandBit.Dispose();                    totalTime++;                    //secCount = (secCount % (60 * scale)) + 1;
                    //if (totalTime % 60 == 0)
                    //{
                    //    minCount = (minCount % (60 * scale)) + 1;
                    //}                    //if (totalTime % 3600 == 0)
                    //{
                    //    hourCount = (hourCount % (24 * scale)) + 1;
                    //}
                    secCount = DateTime.Now.Second;
                    minCount = DateTime.Now.Minute;
                    hourCount = ((DateTime.Now.Hour));                    thr.Join(timeSpan);                         }
                while (true);
            }            
        }
    }
}

Answer 5

谢谢这么多热心人！
我的窗体中有listview 控件，通过timer定时控制刷新该控件的项值，timer的时间间隔是设为1000ms的，如果加长，就起不到实时效果了！该咋办呢？

Answer 6

我的写法是：
        private void timer1_Tick(object sender, EventArgs e)
        {
            foreach (ListViewItem item in this.listView1.Items)
            {
                if (item.Tag != null)
                {
                    ParamObject po = item.Tag as ParamObject;
                    item.SubItems[2].Text = po.Value;
                }
            }        }

Answer 7

先Clear再逐项添加肯定闪，建议RemoveAt(),Insert()之类，或对对应项进行修改