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
