<Window x:Class="SerialPortDebug.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:SerialPortDebug"
        mc:Ignorable="d"
        Title="串口调试助手 - ASCII" Height="450" Width="800" WindowStartupLocation="CenterScreen" Loaded="Window_Loaded">
    <Grid Margin="0,0,0,0.5">
        <Grid.RowDefinitions>
            <RowDefinition Height="292*"/>
            <RowDefinition Height="131*"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="236"/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <GroupBox Header="配置" Margin="10" Grid.RowSpan="2">
            <Grid >
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="83"/>
                    <ColumnDefinition Width="121"/>
                </Grid.ColumnDefinitions>
                <Grid.RowDefinitions>
                    <RowDefinition Height="30"/>
                    <RowDefinition Height="30"/>
                    <RowDefinition Height="30"/>
                    <RowDefinition Height="30"/>
                    <RowDefinition Height="30"/>
                    <RowDefinition Height="30"/>
                    <RowDefinition Height="30"/>
                    <RowDefinition Height="14"/>
                    <RowDefinition/>
                </Grid.RowDefinitions>
                <Label Name="label1" Content="端口" Margin="37,2,9,2" VerticalAlignment="Center" Height="26" HorizontalContentAlignment="Right"/>
                <Label Name="label2" Content="波特率" Margin="0,2,10,2" VerticalAlignment="Center" Height="26" Width="54" Grid.Row="1" HorizontalAlignment="Right" HorizontalContentAlignment="Right"/>
                <Label Name="label3" Content="奇偶校验位" HorizontalAlignment="Right" Margin="0,2,10,2" VerticalAlignment="Center" Height="26" Width="71" Grid.Row="2" HorizontalContentAlignment="Right"/>
                <Label Name="label4" Content="停止位" HorizontalAlignment="Right" Margin="0,2,10,2" VerticalAlignment="Center" Height="26" Width="54" Grid.Row="3" HorizontalContentAlignment="Right"/>
                <Label Name="label5" Content="数据位" HorizontalAlignment="Right" Margin="0,4,10,2" VerticalAlignment="Center" Height="24" Width="54" Grid.Row="4" HorizontalContentAlignment="Right"/>
                <Label  Name="label6" Content="流控制" HorizontalAlignment="Right" VerticalAlignment="Center" Height="25" Width="54" Grid.Row="5" Margin="0,3,10,2" HorizontalContentAlignment="Right"/>
                <Label  Name="label7" Content="超时(ms)" HorizontalAlignment="Right" VerticalAlignment="Center" Height="26" Width="61" Grid.Row="6" Margin="0,2,10,2" HorizontalContentAlignment="Right"/>
                <ComboBox Name="comboBox1" Grid.Column="1" Margin="15,4,18,4" VerticalAlignment="Center" Height="22"/>
                <ComboBox Name="comboBox2" Grid.Column="1" Margin="15,4,18,4" VerticalAlignment="Center" Height="22" Grid.Row="1"/>
                <ComboBox Name="comboBox3" Grid.Column="1" Margin="15,4,18,4" VerticalAlignment="Center" Height="22" Grid.Row="2"/>
                <ComboBox Name="comboBox4" Grid.Column="1" Margin="15,4,18,4" VerticalAlignment="Center" Height="22" Grid.Row="3"/>
                <ComboBox Name="comboBox5" Grid.Column="1" Margin="15,4,18,4" VerticalAlignment="Center" Height="22" Grid.Row="4"/>
                <ComboBox Name="comboBox6" Grid.Column="1" Margin="15,4,18,4" VerticalAlignment="Center" Height="22" Grid.Row="5"/>
                <TextBox Name="textBox1" Grid.Column="1" Height="22" Margin="15,4,18,4" Grid.Row="6" TextWrapping="Wrap" Text="2000" VerticalAlignment="Center"/>
                <Button Name="button1" Content="开启" Grid.Column="1" Margin="15,10,18,0" Grid.Row="8" VerticalAlignment="Top" Height="26" Click="button1_Click"/>
            </Grid>
        </GroupBox>
        <GroupBox Name="groupBox1" Grid.Column="1" Header="接收区" Margin="10,5,10,14.5">
            <Grid >
                <Grid.RowDefinitions>
                    <RowDefinition Height="5*"/>
                    <RowDefinition Height="246*"/>
                </Grid.RowDefinitions>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition/>
                </Grid.ColumnDefinitions>
                <TextBox Name="textBox2" Margin="10,5,10,10" Grid.Row="1" TextWrapping="Wrap" Text="TextBox"/>
            </Grid>
        </GroupBox>
        <GroupBox Name="groupBox2" Grid.Column="1" Header="发送区" Margin="10,0.5,10,10" Grid.Row="1">
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="317*"/>
                    <ColumnDefinition Width="70"/>
                    <ColumnDefinition Width="80"/>
                    <ColumnDefinition Width="80"/>
                </Grid.ColumnDefinitions>
                <Grid.RowDefinitions>
                    <RowDefinition/>
                    <RowDefinition Height="23"/>
                </Grid.RowDefinitions>
                <TextBox Name="textBox3" Margin="10,10,6,10" TextWrapping="Wrap" Text="TextBox" Grid.ColumnSpan="4"/>
                <Button x:Name="button2" Content="回车发送" Grid.Column="2" HorizontalAlignment="Center" Margin="0" Grid.Row="1" VerticalAlignment="Center" Width="70" Height="19" Click="button2_Click"/>
                <Button Name="button3" Content="直接发送" Grid.Column="3" HorizontalAlignment="Center" Margin="5,2" Grid.Row="1" VerticalAlignment="Center" Width="70" Height="19" Click="button3_Click"/>

            </Grid>
        </GroupBox>

    </Grid>
</Window>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
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;
using System.Threading;

namespace SerialPortDebug
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void EnableReceiveAndSendGroup(bool isFirstLoad, bool enable)
        {
            groupBox1.IsEnabled = enable;
            if (isFirstLoad)
            {
                textBox2.IsEnabled = false;
                textBox2.Clear();
            }
            groupBox2.IsEnabled = enable;
            if (!textBox3.IsEnabled) textBox3.Clear();
        }

        private void LoadParameters()
        {
            EnableReceiveAndSendGroup(true, false);
            button1.IsEnabled = false;
            comboBox1.ItemsSource = SerialPortHelper.GetSerialPorts();
            if (comboBox1.Items.Count == 0) return;
            button1.IsEnabled = true;
            comboBox1.Text = comboBox1.Items[0].ToString();
            comboBox2.ItemsSource = SerialPortHelper.GetBaudRates();
            comboBox2.Text = comboBox2.Items[9].ToString();
            comboBox3.ItemsSource = SerialPortHelper.GetParities();
            comboBox3.Text = comboBox3.Items[0].ToString();
            comboBox4.ItemsSource = SerialPortHelper.GetStopBits();
            comboBox4.Text = comboBox4.Items[1].ToString();
            comboBox5.ItemsSource = SerialPortHelper.GetDataBits();
            comboBox5.Text = comboBox5.Items[1].ToString();
            comboBox6.ItemsSource = SerialPortHelper.GetFlowControls();
            comboBox6.Text = comboBox6.Items[0].ToString();
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            LoadParameters();
        }

        private void EnableConfig(bool enable)
        {
            if (enable) button1.Content = "开启";
            else button1.Content = "关闭";
            label1.IsEnabled = enable;
            label2.IsEnabled = enable;
            label3.IsEnabled = enable;
            label4.IsEnabled = enable;
            label5.IsEnabled = enable;
            label6.IsEnabled = enable;
            label7.IsEnabled = enable;
            comboBox1.IsEnabled = enable;
            comboBox2.IsEnabled = enable;
            comboBox3.IsEnabled = enable;
            comboBox4.IsEnabled = enable;
            comboBox5.IsEnabled = enable;
            comboBox6.IsEnabled = enable;
            textBox1.IsEnabled = enable;
        }

        SerialPort serialPort;

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            if (button1.Content.ToString() == "开启")
            {
                try
                {
                    if (!int.TryParse(textBox1.Text, out int result))
                    {
                        MessageBox.Show("超时时间设置错误！");
                        return;
                    }

                    serialPort = new SerialPort(comboBox1.Text,
                        SerialPortHelper.GetBaudRate(comboBox2.Text),
                        SerialPortHelper.GetParity(comboBox3.Text),
                        SerialPortHelper.GetDataBit(comboBox5.Text),
                        SerialPortHelper.GetStopBit(comboBox4.Text))
                    {
                        Handshake = SerialPortHelper.GetFlowControl(comboBox6.Text),
                        ReadTimeout = result
                    };
                    serialPort.Encoding = Encoding.ASCII;
                    serialPort.DataReceived += SerialPort_DataReceived;
                    serialPort.Open();
                    EnableConfig(false);
                    EnableReceiveAndSendGroup(false, true);
                }
                catch (Exception ex)
                {
                    serialPort.Close();
                    MessageBox.Show(ex.Message);
                }
            }
            else
            {
                serialPort.Close();
                EnableConfig(true);
                EnableReceiveAndSendGroup(false, false);
            }
        }

        private void SerialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            textBox2.Dispatcher.Invoke(new Action(() =>
            {
                textBox2.Text += serialPort.ReadExisting();
            }));
        }

        private void button2_Click(object sender, RoutedEventArgs e)
        {
            string text = textBox3.Text + "\r";
            serialPort.Write(Encoding.ASCII.GetBytes(text), 0, text.Length);
        }

        private void button3_Click(object sender, RoutedEventArgs e)
        {
            serialPort.Write(Encoding.ASCII.GetBytes(textBox3.Text), 0, textBox3.Text.Length);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SerialPortDebug
{
    class EnumHelper
    {
        public static T GetValue<T>(string valueString) => (T)Enum.Parse(typeof(T), valueString);
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO.Ports;

namespace SerialPortDebug
{
    class SerialPortHelper
    {
        public static string[] GetSerialPorts() => SerialPort.GetPortNames().OrderBy(x => x).ToArray();
        public static string[] GetBaudRates() => new string[] { "256000", "128000", "115200", "57600", "56000", "43000", "38400", "28800", "19200", "9600", "4800", "2400", "1200", "600", "300", "110" };
        public static string[] GetParities() => Enum.GetNames(typeof(Parity));
        public static string[] GetStopBits() => Enum.GetNames(typeof(StopBits));
        public static string[] GetDataBits() => new string[] { "7", "8", "9" };
        public static string[] GetFlowControls() => Enum.GetNames(typeof(Handshake));

        public static int GetBaudRate(string baudRates) => Convert.ToInt32(baudRates);
        public static Parity GetParity(string parity) => EnumHelper.GetValue<Parity>(parity);
        public static StopBits GetStopBit(string stopbit) => EnumHelper.GetValue<StopBits>(stopbit);
        public static int GetDataBit(string dataBit) => Convert.ToInt32(dataBit);
        public static Handshake GetFlowControl(string flowControl) => EnumHelper.GetValue<Handshake>(flowControl);

    }
}