Winform中使用Websocket4Net实现Websocket客户端并定时存储接收数据到SQLite中

场景

SpringBoot+Vue整合WebSocket实现前后端消息推送：

SpringBoot+Vue整合WebSocket实现前后端消息推送_websocket vue3.0 springboot 往客户端推送-CSDN博客

上面实现ws推送数据流程后，需要在windows上使用ws客户端定时记录收到的数据到文件中，这里

文件使用SQLite数据库进行存储。

Winform中操作Sqlite数据增删改查、程序启动时执行创建表初始化操作：

Winform中操作Sqlite数据增删改查、程序启动时执行创建表初始化操作_winform sqllite-CSDN博客

Sqlite的操作参考如上。

注：

博客：
霸道流氓气质_C#,架构之路,SpringBoot-CSDN博客

实现

1、引入WebSocket4Net依赖

使用Nuget搜索并安装WebSocket4Net

2、设计页面布局如下

3、websocket客户端实现

声明客户端对象

public static WebSocket4Net.WebSocket webSocket4NetClient = null;

ws连接按钮的点击事件中

??????????? try {
??????????????? var wsAddresss = textBox_ws_address.Text.Trim();
??????????????? webSocket4NetClient = new WebSocket4Net.WebSocket(wsAddresss);
??????????????? webSocket4NetClient.Opened += WebSocket4Net_Opened;
??????????????? webSocket4NetClient.Error += Websocket_Error;
??????????????? webSocket4NetClient.Closed += new EventHandler(Websocket_Closed);
??????????????? webSocket4NetClient.MessageReceived += WebSocket4Net_MessageReceived;
??????????????? webSocket4NetClient.Open();
??????????????? textBox_log.AppendText(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + ":ws开始连接");
??????????????? textBox_log.AppendText("\r\n");
??????????? } catch (Exception exception) {
??????????????? textBox_log.AppendText(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + ":ws连接异常:"+ exception.Message);
??????????????? textBox_log.AppendText("\r\n");
??????????? }

这里未添加对ws地址的校验，只关注中间ws相关的代码

??????????????? webSocket4NetClient = new WebSocket4Net.WebSocket(wsAddresss);
??????????????? webSocket4NetClient.Opened += WebSocket4Net_Opened;
??????????????? webSocket4NetClient.Error += Websocket_Error;
??????????????? webSocket4NetClient.Closed += new EventHandler(Websocket_Closed);
??????????????? webSocket4NetClient.MessageReceived += WebSocket4Net_MessageReceived;
??????????????? webSocket4NetClient.Open();

然后编写其各种事件的具体实现。

实现方法中具体逻辑根据业务进行确定。

建立连接事件实现

??????? private void WebSocket4Net_Opened(object sender, EventArgs e)
??????? {
??????????? //允许跨线程调用
??????????? Control.CheckForIllegalCrossThreadCalls = false;
??????????? textBox_log.AppendText(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + ":ws建立连接成功");
??????????? textBox_log.AppendText("\r\n");
??????????? //向服务端发送消息
??????????? //webSocket4NetClient.Send("Client准备发送数据！");
??????? }

收到消息事件实现

??????? private void WebSocket4Net_MessageReceived(object sender, MessageReceivedEventArgs e)
??????? {
??????????? //允许跨线程调用
??????????? Control.CheckForIllegalCrossThreadCalls = false;
??????????? //textBox_log.AppendText(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + ":收到消息:");
??????????? //textBox_log.AppendText("\r\n");
??????????? receviceString = e.Message;
??????? }

出错事件实现

??????? private void Websocket_Error(object sender, EventArgs e)
??????? {
??????????? //允许跨线程调用
??????????? Control.CheckForIllegalCrossThreadCalls = false;
??????????? textBox_log.AppendText(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + ":Websocket_Error:"+e);
??????????? textBox_log.AppendText("\r\n");
??????? }

连接关闭事件实现

??????? private void Websocket_Closed(object sender, EventArgs e)
??????? {
??????????? //允许跨线程调用
??????????? Control.CheckForIllegalCrossThreadCalls = false;
??????????? textBox_log.AppendText(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + ":Websocket_Closed");
??????????? textBox_log.AppendText("\r\n");
??????? }

ws连接关闭按钮点击实现

??????? private void button_ws_disconnec_Click(object sender, EventArgs e)
??????? {
??????????? webSocket4NetClient.Close();
??????? }

4、定时存储实现

在上面收到消息时将数据赋值给变量

receviceString

声明变量

private string receviceString = String.Empty;

添加Timer定时器

Timer _timer = new Timer();

定时存储按钮点击事件实现

??????? private void button_start_store_Click(object sender, EventArgs e)
??????? {
??????????? if (webSocket4NetClient.State != WebSocket4Net.WebSocketState.Open && webSocket4NetClient.State != WebSocket4Net.WebSocketState.Connecting)
??????????? {
??????????????? textBox_log.AppendText(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + ":Websocket连接异常");
??????????????? textBox_log.AppendText("\r\n");
??????????? }
??????????? else {
??????????????? //清空数据库
??????????????? SQLiteDataReader reader = Global.Instance.sqlLiteHelper.ExecuteQuery("SELECT* FROM positions;");
??????????????? if (reader.HasRows)
??????????????? {
??????????????????? while (reader.Read())
??????????????????? {
??????????????????????? Global.Instance.sqlLiteHelper.ExecuteQuery("DELETE FROM positions WHERE timestamp = " + reader.GetString(reader.GetOrdinal("timestamp")) + ";");
??????????????????? }
??????????????? }
??????????????? _timer.Interval = (int)numericUpDown_rate.Value;
??????????????? _timer.Tick += _timer_Tick;
??????????????? _timer.Start();
??????????????? textBox_log.AppendText(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + ":定时存储已经启动!!");
??????????????? textBox_log.AppendText("\r\n");
??????????? }
??????? }

首先判断ws是否连接上，如果连接上则将库清空，然后获取设置的定时频率并启动定时器

定时器具体实现

??????? private void _timer_Tick(object sender, EventArgs e) {
??????????? try
??????????? {
??????????????? if (webSocket4NetClient.State != WebSocket4Net.WebSocketState.Open && webSocket4NetClient.State != WebSocket4Net.WebSocketState.Connecting)
??????????????? {
??????????????????? textBox_log.AppendText(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + ":Websocket连接异常");
??????????????????? textBox_log.AppendText("\r\n");
??????????????? }
??????????????? else {
??????????????????? if (!String.IsNullOrEmpty(receviceString))
??????????????????? {
??????????????????????? //获取ws数据并存储进数据库
??????????????????????? TimeSpan ts = DateTime.Now.ToUniversalTime() - new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
??????????????????????? string timeSpan = Convert.ToInt64(ts.TotalSeconds).ToString();
??????????????????????? //插入数据
??????????????????????? Global.Instance.sqlLiteHelper.InsertValues("positions", new string[] { timeSpan, receviceString });
??????????????????????? receviceString = String.Empty;
??????????????????? }
??????????????? }
??????????? }
??????????? catch (Exception exception)
??????????? {
??????????????? textBox_log.AppendText(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + ":定时存储执行异常：" + exception.Message);
??????????????? textBox_log.AppendText("\r\n");
??????????? }????????
??????? }

首页也要判断是否连接，然后判断receviceString是否为空，避免ws未传输数据，会定时存储空数据。

不为空则将时间和收到的数据存储进数据库。

停止定时存储按钮点击事件

??????? private void button_stop_store_Click(object sender, EventArgs e)
??????? {
??????????? //停止定时器
??????????? _timer.Tick -= _timer_Tick;
??????????? _timer.Stop();
??????????? textBox_log.AppendText(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + ":定时存储已经停止!!！");
??????????? textBox_log.AppendText("\r\n");
??????????? receviceString = String.Empty;
??????? }

5、运行效果