WPF控件属性更改注意事项

在非UI线程上修改ObservableCollection,那么UI可能不会自动更新

public ObservableCollection<txt_log> Logs = new ObservableCollection<txt_log>();
txtLog.ItemsSource = Logs;
void deviceDataRec(CCCD.MsgObjTypeDef msg, out CCCD.MsgObjTypeDef return_msg)
{
        var newLog = new VRAM.devLog(msg.data);

        #region 系统日志记录 -接收

        StaticClass.SentData =

            "收的时间:" + DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss.ff")

            + "     接收数量: " + receiveCount

            + "     log ID:" + newLog.log_devId

            + "     延迟时间:" + (DateTime.Now - StaticClass.sendtime).TotalMilliseconds + "ms"

        ;

        StaticClass.SentID = newLog.log_devId;

        StaticClass.ReceiveCount = receiveCount;

        StaticClass.DelayTime = (DateTime.Now - StaticClass.sendtime).TotalMilliseconds;

        txt_log txt_Log_sent = new txt_log();

        txt_Log_sent.devInfo = StaticClass.SentData;

        syslogsPage.Logs.Add(txt_Log_sent);  //没有在UI线程上

        receiveCount++;
}

txt_Log_sent有数据增加,但是界面没有变化。要确保所有对集合的修改都在UI线程上执行。你可以使用Dispatcher.InvokeDispatcher.BeginInvoke来确保代码在UI线程上执行。

public ObservableCollection<txt_log> Logs = new ObservableCollection<txt_log>();
txtLog.ItemsSource = Logs;
void deviceDataRec(CCCD.MsgObjTypeDef msg, out CCCD.MsgObjTypeDef return_msg)
{
        var newLog = new VRAM.devLog(msg.data);

        #region 系统日志记录 -接收

        StaticClass.SentData =

            "收的时间:" + DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss.ff")

            + "     接收数量: " + receiveCount

            + "     log ID:" + newLog.log_devId

            + "     延迟时间:" + (DateTime.Now - StaticClass.sendtime).TotalMilliseconds + "ms"

        ;

        StaticClass.SentID = newLog.log_devId;

        StaticClass.ReceiveCount = receiveCount;

        StaticClass.DelayTime = (DateTime.Now - StaticClass.sendtime).TotalMilliseconds;

        txt_log txt_Log_sent = new txt_log();

        txt_Log_sent.devInfo = StaticClass.SentData;

        // 使用Dispatcher确保在UI线程上执行  
        Application.Current.Dispatcher.Invoke(() =>  
        {  
            // 将txt_Log对象添加到绑定的ObservableCollection中  
            Logs.Add(txt_Log);  
        }); 
        receiveCount++;
}

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