C# 制作指示灯(经典)

群友提问:C#中的指示灯怎么做,改变状态有什么好的方法吗?

制作指示灯的方法有很多中:比如:

  1. 通过GDI+绘制自定义LED指示灯控件;

  2. 调用现成的第三方控件库;

  3. 采用label标签,通过改变背景色实现;等等

本文就以第三种方式展开讲解

 

01

 

实现效果 

 

02

实现代码

前台代码:

添加两个按钮和一个标签:

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<StackPanel>
      <Border BorderBrush="Red"></Border>
      <Button Name="StartBtn" Content="Start"/>
      <Button Name="StopBtn" Content="Stop"/>
      <Label Name="DisplayLbl" Visibility="{Binding DisplaySwitch}" FontSize="200"
             HorizontalAlignment="Center" VerticalAlignment="Center"
             Content="{Binding LabelText}" Foreground="{Binding ForeColor}" />
  </StackPanel>

  

后台代码:

①安装PropertyChanged.Fody,using PropertyChanged;然后在类前面添加   [AddINotifyPropertyChangedInterface],类中所有属性变更后就会自动通知界面变更;

②通过DisplaySwitch 属性控制指示灯的显示或者隐藏,然后通过界面的start按钮启动指示灯,stop关闭指示灯;

③指示灯背景色的改变通过独立线程控制,跨线程修改UI线程控件属性使用Caliburn.Micro框架下的  Execute.OnUIThread(()=>{});实现。

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using PropertyChanged;
using System.Threading;
using System.Windows;
using System.Windows.Media;
using Brush = System.Windows.Media.Brush;
 
namespace Caliburn.Micro.Hello
{
    [AddINotifyPropertyChangedInterface]
    public class IndicatorLightViewModel : IViewModel
    {
        public Visibility DisplaySwitch { get; set; } = Visibility.Hidden;
        public string LabelText { get; set; }
 
        public Brush ForeColor { get; set; }
 
        private Thread workTask;
        public IndicatorLightViewModel()
        {
            ForeColor = new SolidColorBrush(Color.FromRgb(255, 0, 0));
        }
        public void StartBtn()
        {
            DisplaySwitch = Visibility.Visible;
            LabelText = "●";
            if (workTask == null || !workTask.IsAlive)
            {
                workTask = new Thread(IndicatorLightOperation);//添加线程
                workTask.IsBackground = true;
                workTask.Start();
            }
        }
        public void StopBtn()
        {
            if (workTask == null || workTask.IsAlive)
            {
                workTask.Abort();
            }
            DisplaySwitch = Visibility.Hidden;
        }
 
        public void IndicatorLightOperation()
        {
            while (true)
            {
                Execute.OnUIThread(()=>
                {
                    if (((SolidColorBrush)ForeColor).Color.Equals(Color.FromRgb(255, 0, 0)))
                    {
                        ForeColor = new SolidColorBrush(Color.FromRgb(0, 255, 0));
                    }
                    else
                    {
                        ForeColor = new SolidColorBrush(Color.FromRgb(255, 0, 0));
                    }
                });
                Thread.Sleep(500);
            }
 
        }
    }
}

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posted @   zls366  阅读(1754)  评论(0编辑  收藏  举报
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