// 这里确实有个多线程的问题，不知道到底用到了几个线程，需要解决多线程的问题吗？
// http://stackoverflow.com/questions/4876414/how-to-prevent-system-timers-timer-from-queuing-for-execution-on-a-thread-pool#
private void OnTimedEvent(Object source, System.Timers.ElapsedEventArgs e)
{
if (opcClient.Connected == false)
{
try
{
opcClient.Disconnect();
bool result = opcClient.Connect();
if (result)
{
if (opcClient.Connected != false)
{
// 添加Tags，AddTags
//opcClient.AddTags1(keyTagMap);
AddTagsDelegate worker = AddTagsWorker;
IAsyncResult asyncResult = worker.BeginInvoke(AddTagsCompleted, worker);
//this.treeListView.BeginInvoke(new AddTagsDelegate(AddTagsWorker1));
}
else
{
}
}
}
catch (Exception ex)
{
// 这里Catch 一个 System.Threading.ThreadAbortException，看起来已经catch了。
aTimer.Enabled = true;
}
}
else
{
try {
Console.WriteLine();
if (this.treeListView.InvokeRequired)
{
//this.treeListView.Invoke((MethodInvoker) delegate { DoRereshTreeList(); });
}
else
{
//this.treeListView.Refresh();
}
} catch (Exception ex)
{
}
}
aTimer.Enabled = true;
}
///////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Add a batch of tags to the opc server
/// </summary>
/// <param name="tags"></param>
///////////////////////////////////////////////////////////////////////////////////////////
public void AddTags1(SortedDictionary <string, OPCTag> opcTags, string groupName = null, bool removeFormer = false)
{
Console.WriteLine("in OPCClient, AddTags1, Thread id is: " + System.Threading.Thread.CurrentThread.ManagedThreadId);
AddTagsDelegate worker = AddTagsWorker;
IAsyncResult asyncResult = worker.BeginInvoke(opcTags, groupName, removeFormer, AddTagsCompleted, worker);
}
/// <summary>
/// 【按钮】连接ＯＰＣ服务器
/// </summary>
private void btnConnLocalServer_Click(object sender, EventArgs e)
{
try
{
if (this.btnConnServer.Text == "连接")
{
if (String.IsNullOrEmpty(this.txtRemoteServerIP.Text))
{
this.txtRemoteServerIP.Text = "127.0.0.1";
}
opcClient.Initialize(cmbServerName.Text, this.txtRemoteServerIP.Text);
bool result = opcClient.Connect();
if (!result)
{
// 在这里处理连接错误
MessageBox.Show("不能连接到OPC Server：" + cmbServerName.Text, "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
this.btnConnServer.Enabled = false;
// 启动Timer，去定时坚持是否连接正常
aTimer = new System.Timers.Timer();
aTimer.Interval = 1000;
// Alternate method: create a Timer with an interval argument to the constructor.
//aTimer = new System.Timers.Timer(2000);
// Create a timer with a two second interval.
//aTimer = new System.Timers.Timer(5000);
// Hook up the Elapsed event for the timer.
aTimer.Elapsed += OnTimedEvent;
// Have the timer fire repeated events (true is the default)
aTimer.AutoReset = false;
// Start the timer
aTimer.Enabled = true;
TextOverlay textOverlay = this.treeListView.OverlayText as TextOverlay;
textOverlay.Alignment = System.Drawing.ContentAlignment.MiddleCenter;
textOverlay.TextColor = Color.Firebrick;
textOverlay.BackColor = Color.AntiqueWhite;
textOverlay.BorderColor = Color.DarkRed;
textOverlay.BorderWidth = 4.0f;
textOverlay.Font = new Font("宋体", 36);
//textOverlay.Rotation = -5;
textOverlay.Text = "正在加载Tag...";
this.treeListView.RefreshOverlays();
if (!treeInitialized)
{
InitializeTree();
}
// 添加Tags，AddTags
//opcClient.AddTags1(keyTagMap);
AddTagsDelegate worker = AddTagsWorker;
IAsyncResult asyncResult = worker.BeginInvoke(AddTagsCompleted, worker);
//this.treeListView.BeginInvoke(new AddTagsDelegate(AddTagsWorker1));
this.btnConnServer.Text = "断开";
}
else
{
aTimer.Enabled = false;
aTimer = null;
Thread.Sleep(1000);
if (opcClient.Connected == true)
{
opcClient.Disconnect();
}
// 这样行不行？
// 显然不够，因为还得加 Column 类的
//this.treeListView = new BrightIdeasSoftware.TreeListView();
//this.treeListView.Clear();
this.treeListView.ClearObjects();
Thread.Sleep(1000);
treeInitialized = false;
keyTagMap.Clear();
rootTagMap.Clear();
allTagNames.Clear();
seqId = 1;
lastTag = null;
this.btnConnServer.Text = "连接";
this.ExpandAllNodes.Enabled = false;
this.ExpandAllNodes.Text = "全部展开";
}
}
catch (Exception err)
{
MessageBox.Show("初始化出错：" + err.Message, "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
}
