使用System.Threading.Timer进行Datagridview

Question

这个问题导致程序运行几分钟。 在我使用System.Timers.Timer之前没有发现问题，直到我改为System.Threading.Timer 。

我想知道......

这个问题的根本原因是什么？

如何解决这个问题呢 ？

A first chance exception of type 'System.InvalidOperationException' occurred in System.Windows.Forms.dll
    System.Transactions Critical: 0 : <TraceRecord xmlns="http://schemas.microsoft.com/2004/10/E2ETraceEvent/TraceRecord" Severity="Critical"><TraceIdentifier>http://msdn.microsoft.com/TraceCodes/System/ActivityTracing/2004/07/Reliability/Exception/Unhandled</TraceIdentifier><Description>Unhandled exception</Description><AppDomain>InternetCafe.vshost.exe</AppDomain><Exception><ExceptionType>System.InvalidOperationException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</ExceptionType><Message>BindingSource cannot be its own data source. Do not set the DataSource and DataMember properties to values that refer back to BindingSource.</Message><StackTrace>   at System.Windows.Forms.BindingSource.get_Count()
       at System.Windows.Forms.CurrencyManager.get_Count()
       at System.Windows.Forms.DataGridView.DataGridViewDataConnection.currencyManager_ListChanged(Object sender, ListChangedEventArgs e)
       at System.Windows.Forms.CurrencyManager.OnListChanged(ListChangedEventArgs e)
       at System.Windows.Forms.CurrencyManager.List_ListChanged(Object sender, ListChangedEventArgs e)
       at System.Windows.Forms.BindingSource.OnListChanged(ListChangedEventArgs e)
       at System.Windows.Forms.BindingSource.InnerList_ListChanged(Object sender, ListChangedEventArgs e)
       at System.ComponentModel.BindingList`1.OnListChanged(ListChangedEventArgs e)
       at System.ComponentModel.BindingList`1.Child_PropertyChanged(Object sender, PropertyChangedEventArgs e)
       at InternetCafe.Computer.NotifyPropertyChanged(String info) in C:\Users\at0m\Documents\Visual Studio 2010\Projects\InternetCafe\InternetCafe\Computer.cs:line 163
       at InternetCafe.Computer.UsedTimeValueChanged(Object sender, PropertyChangedEventArgs e) in C:\Users\at0m\Documents\Visual Studio 2010\Projects\InternetCafe\InternetCafe\Computer.cs:line 149
       at InternetCafe.TimerManager.OnTimeChanged(PropertyChangedEventArgs e) in C:\Users\at0m\Documents\Visual Studio 2010\Projects\InternetCafe\InternetCafe\TimerManager.cs:line 62
       at InternetCafe.TimerManager.set_TimeSinceStartTime(TimeSpan value) in C:\Users\at0m\Documents\Visual Studio 2010\Projects\InternetCafe\InternetCafe\TimerManager.cs:line 30
       at InternetCafe.TimerManager.tmrThreadingTimer_TimerCallback(Object state) in C:\Users\at0m\Documents\Visual Studio 2010\Projects\InternetCafe\InternetCafe\TimerManager.cs:line 50
       at System.Threading._TimerCallback.TimerCallback_Context(Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
       at System.Threading._TimerCallback.PerformTimerCallback(Object state)</StackTrace><ExceptionString>System.InvalidOperationException: BindingSource cannot be its own data source. Do not set the DataSource and DataMember properties to values that refer back to BindingSource.
       at System.Windows.Forms.BindingSource.get_Count()
       at System.Windows.Forms.CurrencyManager.get_Count()
       at System.Windows.Forms.DataGridView.DataGridViewDataConnection.currencyManager_ListChanged(Object sender, ListChangedEventArgs e)
       at System.Windows.Forms.CurrencyManager.OnListChanged(ListChangedEventArgs e)
       at System.Windows.Forms.CurrencyManager.List_ListChanged(Object sender, ListChangedEventArgs e)
       at System.Windows.Forms.BindingSource.OnListChanged(ListChangedEventArgs e)
       at System.Windows.Forms.BindingSource.InnerList_ListChanged(Object sender, ListChangedEventArgs e)
       at System.ComponentModel.BindingList`1.OnListChanged(ListChangedEventArgs e)
       at System.ComponentModel.BindingList`1.Child_PropertyChanged(Object sender, PropertyChangedEventArgs e)
       at InternetCafe.Computer.NotifyPropertyChanged(String info) in C:\Users\at0m\Documents\Visual Studio 2010\Projects\InternetCafe\InternetCafe\Computer.cs:line 163
       at InternetCafe.Computer.UsedTimeValueChanged(Object sender, PropertyChangedEventArgs e) in C:\Users\at0m\Documents\Visual Studio 2010\Projects\InternetCafe\InternetCafe\Computer.cs:line 149
       at InternetCafe.TimerManager.OnTimeChanged(PropertyChangedEventArgs e) in C:\Users\at0m\Documents\Visual Studio 2010\Projects\InternetCafe\InternetCafe\TimerManager.cs:line 62
       at InternetCafe.TimerManager.set_TimeSinceStartTime(TimeSpan value) in C:\Users\at0m\Documents\Visual Studio 2010\Projects\InternetCafe\InternetCafe\TimerManager.cs:line 30
       at InternetCafe.TimerManager.tmrThreadingTimer_TimerCallback(Object state) in C:\Users\at0m\Documents\Visual Studio 2010\Projects\InternetCafe\InternetCafe\TimerManager.cs:line 50
       at System.Threading._TimerCallback.TimerCallback_Context(Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
       at System.Threading._TimerCallback.PerformTimerCallback(Object state)</ExceptionString></Exception></TraceRecord>

---

TimerManager类

物业TimeSinceStartTime

public TimeSpan TimeSinceStartTime
    {
        get { return new TimeSpan(timeSinceStartTime.Hours, timeSinceStartTime.Minutes, timeSinceStartTime.Seconds); }
        set
        {
            if (timeSinceStartTime != value)
            {
                timeSinceStartTime = value;
                OnTimeChanged(new PropertyChangedEventArgs("TimeSinceStartTime"));
            }
        }
    }

TimerManager构造函数

 public TimerManager(frmMainServer main)
    {
        _timer = new System.Threading.Timer(new
                   TimerCallback(tmrThreadingTimer_TimerCallback),
                   null, System.Threading.Timeout.Infinite, 1000);
        _main = main;
    }

OnTimeChanged

private void OnTimeChanged(PropertyChangedEventArgs e)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, e);
        }
    }

定时器回调

private void tmrThreadingTimer_TimerCallback(object state)
    {
        TimeSinceStartTime += TimeSpan.FromSeconds(1);
    }

---

电脑课

重要财产

public decimal TotalMoney
    {
        get
        {
            return this.totalMoney;
        }

        set
        {
            if (value != this.totalMoney)
            {
                this.totalMoney = value;
                NotifyPropertyChanged("TotalMoney");
            }
        }
    }

    public TimerManager UsedTime
    {
        get
        {
            return this.usedTimeValue;

        }

        set
        {
            if (value != this.usedTimeValue)
            {
                this.usedTimeValue = value;
                NotifyPropertyChanged("UsedTimeValue");
                usedTimeValue.PropertyChanged += new PropertyChangedEventHandler(UsedTimeValueChanged);       
            }
        }
    }

如果时间变更计算费用，请通知Usedtime和TotalMoney。

 private void UsedTimeValueChanged(object sender, PropertyChangedEventArgs e)
   {
       NotifyPropertyChanged("UsedTime");
       this.totalMoney = (decimal)(this.UsedTime.TimeSinceStartTime.Hours * this.session.Member.MemberTariff + this.UsedTime.TimeSinceStartTime.Minutes * (this.session.Member.MemberTariff / 60));
       NotifyPropertyChanged("TotalMoney");
   }

---

主要表格

使用dbBindingSource设置CompList gridview数据源，并使用Computers绑定列表设置dbBindingSource数据源。

public BindingList<Computer> computers = new BindingList<Computer>();
.
.
.
compList.DataSource = dbBindingSource;
dbBindingSource.DataSource = computers;

Answer 1

根本原因是您正在更改绑定到UI控件的非UI线程中的数据源。 最简单的解决方案是使用System.Windows.Forms.Timer ，它始终在UI线程上执行，但是，它的分辨率不是很高或准确。 下一个选项是确保使用SynchronizationContext或使用Invoke / BeginInvoke在UI线程上引发PropertyChanged。