C#編程之Slider控件使用

今天說一下slider控件的使用。該控件主要使用功能有以下幾點：

1. slider值的獲取；
2. slider值的設定；
3. slider值的變化量；
4. slider值的范圍；

下面一一講解：

slider值的獲取，可以直接將其綁定對編輯框或文本框  Text="{Binding ElementName=mySlider,Path=Value}" 或者 double k = mySlider.Value; 

slider值設定可以直接賦值給Value： mySlider.Value = 1500; 

slider變化量由tick設定： TickFrequency="5" （代表每次變化量為5），因為slider值類型是double類型，所以如果需要忽略小數點時，可以通過： IsSnapToTickEnabled="True" 實現.

slider值范圍設定：通過selection設置： SelectionStart="1000" SelectionEnd="2000" 

 

例程：通過設定slider參數，將slider值通過串口發射出去（考慮到slider變化頻率過高，導致發射失敗，這里采用定時器讀取slider值，如果發現其值改變，則發送數據，類似於加入消抖功能）：

1. 設計UI界面：
2. 后台代碼：

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

    

3. 添加源碼：

   using System;
   using System.Collections.Generic;
   using System.Linq;
   using System.Text;
   using System.Threading.Tasks;
   using System.Windows;
   using System.Windows.Controls;
   using System.Windows.Data;
   using System.Windows.Documents;
   using System.Windows.Input;
   using System.Windows.Media;
   using System.Windows.Media.Imaging;
   using System.Windows.Navigation;
   using System.Windows.Shapes;
   using System.IO.Ports;//supported serial port
   using System.Security.Cryptography;//supported security crypto
   using System.Threading;
   using System.Windows.Threading;
   
   namespace ServoApp
   {
       /// <summary>
       /// Interaction logic for MainWindow.xaml
       /// </summary>
       public partial class MainWindow : Window
       {
           System.Timers.Timer myTimer = new System.Timers.Timer(50);
           SerialPort myPort = new SerialPort();
           bool myPortCurrentStateOpen;
           string str_tmp;
           public MainWindow()
           {
               InitializeComponent();
               //comboxs init
               myComboxs();
               //receive routine
               myPort.DataReceived += DataReceived;
               myTimer.Elapsed += new System.Timers.ElapsedEventHandler(timer_Elapsed);
               myTimer.Enabled = true;
           }
           private void DataReceived(object sender,SerialDataReceivedEventArgs e)
           {
               byte[] inbuf = new byte[4];
               try 
               {
                   myPort.Read(inbuf, 0, inbuf.Length);
                   string str = System.Text.Encoding.Default.GetString(inbuf);
                   this.Dispatcher.Invoke(new Action(() =>
                   {
                       myRX.Text = str;
                       }));
               }
               catch(Exception ex)
               {
                   MessageBox.Show(ex.Message);
               }
           }
           private void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
           {
               try 
               {
                   this.Dispatcher.Invoke(DispatcherPriority.Normal, (Action)(() =>
                       {
                           if (myPortCurrentStateOpen == true)
                           {
                               if (mySlider.IsEnabled == false)
                               {
                                   myRX.IsReadOnly = true;
                                   myRX.IsEnabled = true;
                                   mySlider.IsEnabled = true;
                               }
                               if (str_tmp != tblock.Text)
                               {
                                   str_tmp = tblock.Text;
                                   myPort.Write(str_tmp);
                               }
                           }
                           else
                           {
                               myRX.IsEnabled = false;
                               mySlider.IsEnabled = false;
                           }
                       }));
               }
               catch (Exception ex)
               {
                   MessageBox.Show(ex.Message);
               }
           }
           private void myComboxs()
           {
               //Set COM items
               myCOM.Items.Add("COM0");
               myCOM.Items.Add("COM1");
               myCOM.Items.Add("COM2");
               myCOM.Items.Add("COM3");
               myCOM.Items.Add("COM4");
               //default value
               myCOM.SelectedIndex = myCOM.Items.IndexOf("COM1");
               //Set BRT items
               myBaudRate.Items.Add("2400");
               myBaudRate.Items.Add("4800");
               myBaudRate.Items.Add("9600");
               myBaudRate.Items.Add("38400");
               myBaudRate.Items.Add("115200");
               //default value
               myBaudRate.SelectedIndex = myBaudRate.Items.IndexOf("9600");
               myPortCurrentStateOpen = false;
           }
   
           private void open_Clk(object sender, RoutedEventArgs e)
           {
               try
               {
                   if (myPortCurrentStateOpen == false)
                   {
                       if(myPort.IsOpen)
                       {
                           myPort.Close();
                       }
                       myPort.BaudRate = int.Parse(myBaudRate.Text);
                       myPort.DataBits = 8;
                       myPort.PortName = myCOM.Text;
                       myPort.Open();
                       myPortCurrentStateOpen = true;
                       myBtn.Content = "Close";
                   }
                   else
                   {
                       myPort.Close();
                       myBtn.Content = "Open";
                       mySlider.Value = 1500;
                       myPortCurrentStateOpen = false;
                   }
               }
               catch(Exception ex)
               {
                   MessageBox.Show(ex.Message);
               }
           }
       }
   }

    

4. 運行：
5. End，謝謝！