與串口發送數據和接收數據，在此作一個簡單的Demo.此Demo可以實現按下硬件按鈕，燈亮，發送燈狀態數據過來。並且可以實現幾個燈同時亮，發送燈的狀態數據過來。PC端實現點擊按鈕讓硬件燈亮。
此處為4個燈，發送過來的數據：0代表暗，1代表亮。列如：1010代表1號燈和3號燈亮，2號和4號燈暗。
發送過去的數據：0代表1號燈亮，1代表1號燈滅、2代表2號燈亮，3代表2號燈滅、4代表3號燈亮，5代表3號燈滅、6代表4號燈亮，7代表4號燈滅。
布局代碼：

<Grid
 
>
        <TextBox HorizontalAlignment="Left" Height="23" Margin="112,59,0,0" TextWrapping="Wrap" Name="txtSend" VerticalAlignment="Top" Width="120"/>
        <TextBox HorizontalAlignment="Left" Height="23" Margin="112,113,0,0" TextWrapping="Wrap" Name="txtReceive" VerticalAlignment="Top" Width="120"
 
/>
        <Button Content="發送" Name="btnSend" HorizontalAlignment="Left" Margin="83,271,0,0" VerticalAlignment="Top" Width="35" Click="btnSend_Click"/>
        <Button Content="發送" Name="btnSend1" HorizontalAlignment="Left" Margin="143,271,0,0" VerticalAlignment="Top" Width="35" Click="btnSend1_Click"
 
/>
        <Button Content="發送" Name="btnSend2" HorizontalAlignment="Left" Margin="203,271,0,0" VerticalAlignment="Top" Width="35" Click="btnSend2_Click"/>
        <Button Content="發送" Name="btnSend3" HorizontalAlignment="Left" Margin="263,271,0,0" VerticalAlignment="Top" Width="35" Click="btnSend3_Click"/>


        <Label Name="one" Background="Red" HorizontalAlignment="Left" Margin="84,190,0,0" VerticalAlignment="Top" Height="24" Width="28"/>
        <Label Name="two" Background="Red" HorizontalAlignment="Left" Margin="144,190,0,0" VerticalAlignment="Top" Height="24" Width="28"/>
        <Label Name="three" Background="Red" HorizontalAlignment="Left" Margin="204,190,0,0" VerticalAlignment="Top" Height="24" Width="28"/>
        <Label Name="four" Background="Red" HorizontalAlignment="Left" Margin="264,190,0,0" VerticalAlignment="Top" Height="24" Width="28"/>



    </Grid>

後臺代碼：
先

private SerialPort Sp = new SerialPort();
        public delegate void HandleInterfaceUpdataDelegate(string text);
        private HandleInterfaceUpdataDelegate interfaceUpdataHandle;

        String[] arr = { "0", "0", "0", "0" };//用於存儲硬件上面燈狀態

其次在Loaded事件添加用於更改串口參數：

 //更改參數
            Sp.PortName = "COM3";
            Sp.BaudRate = 115200;
            Sp.Parity = Parity.None;
            Sp.StopBits = StopBits.One;

編寫監聽和發送數據事件：
private void Serial()
        {
            Sp.DataReceived += new SerialDataReceivedEventHandler(Sp_DataReceived);
            if (!Sp.IsOpen)
            {
                Sp.Open();
            }
            //用字節的形式發送數據
            SendBytesData(Sp);
        }

        //發送二進制數據
        private void SendBytesData(SerialPort Sp)
        {

            byte[] bytesSend = System.Text.Encoding.Default.GetBytes(txtSend.Text);
            Sp.Write(bytesSend, 0, bytesSend.Length);

        }



        public void Sp_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {
           /* byte[] readBuffer = new byte[Sp.ReadBufferSize];
            Sp.Read(readBuffer, 0, readBuffer.Length);
            //Dispatcher.Invoke(interfaceUpdataHandle, new string[]{ Encoding.UTF8.GetString(readBuffer)});
            Dispatcher.Invoke(interfaceUpdataHandle, new string[] { Encoding.ASCII.GetString(readBuffer) });
            //Dispatcher.Invoke(interfaceUpdateHandle, new string[] { Encoding.ASCII.GetString(buf) });*/

            SerialPort serialPort = (SerialPort)(sender);
            System.Threading.Thread.Sleep(100);//延緩一會，用於防止硬件發送速率跟不上緩存數據導致的緩存數據雜亂
            int n = serialPort.BytesToRead;//先記錄下來，避免某種原因，人為的原因，操作幾次之間時間長，緩存不一致  
            byte[] buf = new byte[n];//聲明一個臨時數組存儲當前來的串口數據  
            //received_count += n;//增加接收計數  
            serialPort.Read(buf, 0, n);//讀取緩沖數據  
            //因為要訪問ui資源，所以需要使用invoke方式同步ui
            interfaceUpdataHandle = new HandleInterfaceUpdataDelegate(UpdateTextBox);//實例化委托對象
            // Dispatcher.Invoke(interfaceUpdateHandle, new string[] { Encoding.ASCII.GetString(buf) });
            Dispatcher.Invoke(interfaceUpdataHandle, new string[] { Encoding.ASCII.GetString(buf) });

            //serialPort.Close();




        }

        private void UpdateTextBox(string text)
        {
            txtReceive.Text = text;

            String Receive = Convert.ToString(text);
            if (Receive != "")
            {
                // MessageBox.Show("receive", Receive);
                String Receive1 = Receive.Substring(0, 1);
                String Receive2 = Receive.Substring(1, 1);
                String Receive3 = Receive.Substring(2, 1);
                String Receive4 = Receive.Substring(3, 1);
                if (Receive1 == 1.ToString())
                {
                    one.Background = new SolidColorBrush(Colors.MediumAquamarine);
                    arr[0] = 1.ToString();
                }
                else
                {
                    one.Background = new SolidColorBrush(Colors.Red);
                    arr[0] = 0.ToString();
                }
                if (Receive2 == 1.ToString())
                {
                    two.Background = new SolidColorBrush(Colors.MediumAquamarine);
                    arr[1] = 1.ToString();
                }
                else
                {
                    two.Background = new SolidColorBrush(Colors.Red);
                    arr[1] = 0.ToString();
                }
                if (Receive3 == 1.ToString())
                {
                    three.Background = new SolidColorBrush(Colors.MediumAquamarine);
                    arr[2] = 1.ToString();
                }
                else
                {
                    three.Background = new SolidColorBrush(Colors.Red);
                    arr[2] = 0.ToString();
                }
                if (Receive4 == 1.ToString())
                {
                    four.Background = new SolidColorBrush(Colors.MediumAquamarine);
                    arr[3] = 1.ToString();
                }
                else
                {
                    four.Background = new SolidColorBrush(Colors.Red);
                    arr[3] = 0.ToString();
                }
                //String abc = Convert.ToString(arr);
                //MessageBox.Show("abc", abc);

                // MessageBox.Show("arr", arr);
            }
        }

最後button點擊事件添加：

 private void btnSend_Click(object sender, RoutedEventArgs e)
        {
            if (arr[0] == 0.ToString())
            {
                txtSend.Text = "0";               
                Serial();
            }
            else
            {
                txtSend.Text = "1";
                Serial();
            }
        }

        private void btnSend1_Click(object sender, RoutedEventArgs e)
        {
            if (arr[1] == 0.ToString())
            {
                txtSend.Text = "2";
                Serial();
            }
            else
            {
                txtSend.Text = "3";
                Serial();
            }
        }

        private void btnSend2_Click(object sender, RoutedEventArgs e)
        {
            if (arr[2] == 0.ToString())
            {
                txtSend.Text = "4";
                Serial();
            }
            else
            {
                txtSend.Text = "5";
                Serial();

            }
        }

        private void btnSend3_Click(object sender, RoutedEventArgs e)
        {
            if (arr[3] == 0.ToString())
            {
                txtSend.Text = "6";
                Serial();
            }
            else
            {
                txtSend.Text = "7";
                Serial();
            }
        }

要想在程序開始時就可以監聽數據，在其Loaded裏面添加上： Serial();
完整後臺代碼：

 public partial class MainWindow : Window
    {

        private SerialPort Sp = new SerialPort();
        public delegate void HandleInterfaceUpdataDelegate(string text);
        private HandleInterfaceUpdataDelegate interfaceUpdataHandle;

        String[] arr = { "0", "0", "0", "0" };//用於存儲硬件上面燈狀態
        public MainWindow()
        {
            InitializeComponent();
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            //更改參數
            Sp.PortName = "COM3";
            Sp.BaudRate = 115200;
            Sp.Parity = Parity.None;
            Sp.StopBits = StopBits.One;

            Serial();
        }

        private void btnSend_Click(object sender, RoutedEventArgs e)
        {
            if (arr[0] == 0.ToString())
            {
                txtSend.Text = "0";               
                Serial();
            }
            else
            {
                txtSend.Text = "1";
                Serial();
            }
        }

        private void btnSend1_Click(object sender, RoutedEventArgs e)
        {
            if (arr[1] == 0.ToString())
            {
                txtSend.Text = "2";
                Serial();
            }
            else
            {
                txtSend.Text = "3";
                Serial();
            }
        }

        private void btnSend2_Click(object sender, RoutedEventArgs e)
        {
            if (arr[2] == 0.ToString())
            {
                txtSend.Text = "4";
                Serial();
            }
            else
            {
                txtSend.Text = "5";
                Serial();

            }
        }

        private void btnSend3_Click(object sender, RoutedEventArgs e)
        {
            if (arr[3] == 0.ToString())
            {
                txtSend.Text = "6";
                Serial();
            }
            else
            {
                txtSend.Text = "7";
                Serial();
            }
        }

        private void Serial()
        {
            Sp.DataReceived += new SerialDataReceivedEventHandler(Sp_DataReceived);
            if (!Sp.IsOpen)
            {
                Sp.Open();
            }
            //用字節的形式發送數據
            SendBytesData(Sp);
        }

        //發送二進制數據
        private void SendBytesData(SerialPort Sp)
        {

            byte[] bytesSend = System.Text.Encoding.Default.GetBytes(txtSend.Text);
            Sp.Write(bytesSend, 0, bytesSend.Length);

        }



        public void Sp_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {
           /* byte[] readBuffer = new byte[Sp.ReadBufferSize];
            Sp.Read(readBuffer, 0, readBuffer.Length);
            //Dispatcher.Invoke(interfaceUpdataHandle, new string[]{ Encoding.UTF8.GetString(readBuffer)});
            Dispatcher.Invoke(interfaceUpdataHandle, new string[] { Encoding.ASCII.GetString(readBuffer) });
            //Dispatcher.Invoke(interfaceUpdateHandle, new string[] { Encoding.ASCII.GetString(buf) });*/

            SerialPort serialPort = (SerialPort)(sender);
            System.Threading.Thread.Sleep(100);//延緩一會，用於防止硬件發送速率跟不上緩存數據導致的緩存數據雜亂
            int n = serialPort.BytesToRead;//先記錄下來，避免某種原因，人為的原因，操作幾次之間時間長，緩存不一致  
            byte[] buf = new byte[n];//聲明一個臨時數組存儲當前來的串口數據  
            //received_count += n;//增加接收計數  
            serialPort.Read(buf, 0, n);//讀取緩沖數據  
            //因為要訪問ui資源，所以需要使用invoke方式同步ui
            interfaceUpdataHandle = new HandleInterfaceUpdataDelegate(UpdateTextBox);//實例化委托對象
            // Dispatcher.Invoke(interfaceUpdateHandle, new string[] { Encoding.ASCII.GetString(buf) });
            Dispatcher.Invoke(interfaceUpdataHandle, new string[] { Encoding.ASCII.GetString(buf) });

            //serialPort.Close();




        }

        private void UpdateTextBox(string text)
        {
            txtReceive.Text = text;

            String Receive = Convert.ToString(text);
            if (Receive != "")
            {
                // MessageBox.Show("receive", Receive);
                String Receive1 = Receive.Substring(0, 1);
                String Receive2 = Receive.Substring(1, 1);
                String Receive3 = Receive.Substring(2, 1);
                String Receive4 = Receive.Substring(3, 1);
                if (Receive1 == 1.ToString())
                {
                    one.Background = new SolidColorBrush(Colors.MediumAquamarine);
                    arr[0] = 1.ToString();
                }
                else
                {
                    one.Background = new SolidColorBrush(Colors.Red);
                    arr[0] = 0.ToString();
                }
                if (Receive2 == 1.ToString())
                {
                    two.Background = new SolidColorBrush(Colors.MediumAquamarine);
                    arr[1] = 1.ToString();
                }
                else
                {
                    two.Background = new SolidColorBrush(Colors.Red);
                    arr[1] = 0.ToString();
                }
                if (Receive3 == 1.ToString())
                {
                    three.Background = new SolidColorBrush(Colors.MediumAquamarine);
                    arr[2] = 1.ToString();
                }
                else
                {
                    three.Background = new SolidColorBrush(Colors.Red);
                    arr[2] = 0.ToString();
                }
                if (Receive4 == 1.ToString())
                {
                    four.Background = new SolidColorBrush(Colors.MediumAquamarine);
                    arr[3] = 1.ToString();
                }
                else
                {
                    four.Background = new SolidColorBrush(Colors.Red);
                    arr[3] = 0.ToString();
                }
                //String abc = Convert.ToString(arr);
                //MessageBox.Show("abc", abc);

                // MessageBox.Show("arr", arr);
            }
        }


    }

這樣可以實現btn和硬件本身按鈕同時控制燈亮燈滅。
若轉載請註明轉載處。

WPF內實現與串口發送數據和接收數據