C#编程之Slider控件使用

今天说一下slider控件的使用。该控件主要使用功能有以下几点：

slider值的获取；
slider值的设定；
slider值的变化量；
slider值的范围；

下面一一讲解：

slider值的获取，可以直接将其绑定对编辑框或文本框 Text="{Binding ElementName=mySlider,Path=Value}" 或者 double k = mySlider.Value;

slider值设定可以直接赋值给Value： mySlider.Value = 1500;

slider变化量由tick设定： TickFrequency="5" （代表每次变化量为5），因为slider值类型是double类型，所以如果需要忽略小数点时，可以通过： IsSnapToTickEnabled="True" 实现.

slider值范围设定：通过selection设置： SelectionStart="1000" SelectionEnd="2000"

例程：通过设定slider参数，将slider值通过串口发射出去（考虑到slider变化频率过高，导致发射失败，这里采用定时器读取slider值，如果发现其值改变，则发送数据，类似于加入消抖功能）：

设计UI界面：

后台代码：

 1 <Window x:Class="ServoApp.MainWindow"
 2         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 3         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 4         Title="ServoApp Milo lu 1.0v" Height="250" Width="390" Background="LightBlue" ResizeMode="CanMinimize">
 5     <Grid x:Name="SeroApp">
 6         <Label Name="m_Com" Content="COM" Margin="10,10,0,0" Width="50" VerticalAlignment="Top" HorizontalAlignment="Left" />
 7         <ComboBox Name="myCOM"      Margin="85,10,0,0" Width="80" VerticalAlignment="Top" HorizontalAlignment="Left" Background="LightBlue"/>
 8         <Label Name="m_Baud" Content="BRT" Margin="10,50,0,0" Width="50" VerticalAlignment="Top" HorizontalAlignment="Left"/>
 9         <ComboBox Name="myBaudRate" Margin="85,50,0,0" Width="80" VerticalAlignment="Top" HorizontalAlignment="Left" Background="LightBlue"/>
10         <Label Name="m_range" Content="Range:" Margin="10,85" VerticalAlignment="Top" HorizontalAlignment="Left" FontWeight="Bold"/>
11         <TextBlock Name="tblock" Text="{Binding ElementName=mySlider,Path=Value}" Margin="85,85" VerticalAlignment="Top" HorizontalAlignment="Left"/>
12         <Slider Name="mySlider" Margin="20,130,0,0" Width="300" VerticalAlignment="Top" HorizontalAlignment="Left" 
13                 IsSnapToTickEnabled="True" Value="1500" Minimum="1000" Maximum="2000" 
14                 SelectionStart="1000" SelectionEnd="2000" TickFrequency="5" TickPlacement="BottomRight"/>
15         <Button Name="myBtn" Content="Open"  Margin="10,180,0,0" Width="50"  VerticalAlignment="Top" HorizontalAlignment="Left" Click="open_Clk"/>
16         <Label Content="Rx" Margin="200,10,0,0" VerticalAlignment="Top" HorizontalAlignment="Left" FontWeight="Bold"/>
17         <TextBox Name="myRX" Margin="200,50,0,0" Width="150" Height="20" VerticalAlignment="Top" HorizontalAlignment="Left" Background="LightBlue"/>
18     </Grid>
19 </Window>

XALM

添加源码：

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Text;
  5 using System.Threading.Tasks;
  6 using System.Windows;
  7 using System.Windows.Controls;
  8 using System.Windows.Data;
  9 using System.Windows.Documents;
 10 using System.Windows.Input;
 11 using System.Windows.Media;
 12 using System.Windows.Media.Imaging;
 13 using System.Windows.Navigation;
 14 using System.Windows.Shapes;
 15 using System.IO.Ports;//supported serial port
 16 using System.Security.Cryptography;//supported security crypto
 17 using System.Threading;
 18 using System.Windows.Threading;
 19 
 20 namespace ServoApp
 21 {
 22     /// <summary>
 23     /// Interaction logic for MainWindow.xaml
 24     /// </summary>
 25     public partial class MainWindow : Window
 26     {
 27         System.Timers.Timer myTimer = new System.Timers.Timer(50);
 28         SerialPort myPort = new SerialPort();
 29         bool myPortCurrentStateOpen;
 30         string str_tmp;
 31         public MainWindow()
 32         {
 33             InitializeComponent();
 34             //comboxs init
 35             myComboxs();
 36             //receive routine
 37             myPort.DataReceived += DataReceived;
 38             myTimer.Elapsed += new System.Timers.ElapsedEventHandler(timer_Elapsed);
 39             myTimer.Enabled = true;
 40         }
 41         private void DataReceived(object sender,SerialDataReceivedEventArgs e)
 42         {
 43             byte[] inbuf = new byte[4];
 44             try 
 45             {
 46                 myPort.Read(inbuf, 0, inbuf.Length);
 47                 string str = System.Text.Encoding.Default.GetString(inbuf);
 48                 this.Dispatcher.Invoke(new Action(() =>
 49                 {
 50                     myRX.Text = str;
 51                     }));
 52             }
 53             catch(Exception ex)
 54             {
 55                 MessageBox.Show(ex.Message);
 56             }
 57         }
 58         private void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
 59         {
 60             try 
 61             {
 62                 this.Dispatcher.Invoke(DispatcherPriority.Normal, (Action)(() =>
 63                     {
 64                         if (myPortCurrentStateOpen == true)
 65                         {
 66                             if (mySlider.IsEnabled == false)
 67                             {
 68                                 myRX.IsReadOnly = true;
 69                                 myRX.IsEnabled = true;
 70                                 mySlider.IsEnabled = true;
 71                             }
 72                             if (str_tmp != tblock.Text)
 73                             {
 74                                 str_tmp = tblock.Text;
 75                                 myPort.Write(str_tmp);
 76                             }
 77                         }
 78                         else
 79                         {
 80                             myRX.IsEnabled = false;
 81                             mySlider.IsEnabled = false;
 82                         }
 83                     }));
 84             }
 85             catch (Exception ex)
 86             {
 87                 MessageBox.Show(ex.Message);
 88             }
 89         }
 90         private void myComboxs()
 91         {
 92             //Set COM items
 93             myCOM.Items.Add("COM0");
 94             myCOM.Items.Add("COM1");
 95             myCOM.Items.Add("COM2");
 96             myCOM.Items.Add("COM3");
 97             myCOM.Items.Add("COM4");
 98             //default value
 99             myCOM.SelectedIndex = myCOM.Items.IndexOf("COM1");
100             //Set BRT items
101             myBaudRate.Items.Add("2400");
102             myBaudRate.Items.Add("4800");
103             myBaudRate.Items.Add("9600");
104             myBaudRate.Items.Add("38400");
105             myBaudRate.Items.Add("115200");
106             //default value
107             myBaudRate.SelectedIndex = myBaudRate.Items.IndexOf("9600");
108             myPortCurrentStateOpen = false;
109         }
110 
111         private void open_Clk(object sender, RoutedEventArgs e)
112         {
113             try
114             {
115                 if (myPortCurrentStateOpen == false)
116                 {
117                     if(myPort.IsOpen)
118                     {
119                         myPort.Close();
120                     }
121                     myPort.BaudRate = int.Parse(myBaudRate.Text);
122                     myPort.DataBits = 8;
123                     myPort.PortName = myCOM.Text;
124                     myPort.Open();
125                     myPortCurrentStateOpen = true;
126                     myBtn.Content = "Close";
127                 }
128                 else
129                 {
130                     myPort.Close();
131                     myBtn.Content = "Open";
132                     mySlider.Value = 1500;
133                     myPortCurrentStateOpen = false;
134                 }
135             }
136             catch(Exception ex)
137             {
138                 MessageBox.Show(ex.Message);
139             }
140         }
141     }
142 }

运行：
End，谢谢！