进度条不与backgroundworker一起工作 [英] progress bar not working with backgroundworker

问题描述

大家好，



我有一个服务器 - 客户端系统正在进行控制服务器表单的客户端命令。



命令是连接，断开连接，发送和接收。



当客户想要发送数据时/从服务器接收数据（命令==发送/接收），在同一服务器表单上显示进度条（选框样式）并在发送/接收完成时隐藏。进度条工作，直到我开始调用服务器命令（冻结）。



问题是服务器命令是（并且必须）由主服务器执行线。



所以即使我在后台工作程序中运行命令，它也无济于事，因为在主线程上调用了实际的服务器命令 - 显示相同的线程进度条。



有什么想法吗？

Hi guys,

I have a server-client system going on with client commands controlling the server form.

The commands are connect, disconnect, send and receive.

When client wants to send data to/receive data from server (command == send/receive), there will be a progress bar (marquee style) shown on the same server form and hide when sending/receiving is done. The progress bar works until i start to invoke server commands (freeze).

The problem is that the server commands are (and must be) executed by server in the main thread.

So even if i run the command in a backgroundworker, it doesn’t help since the actual server commands are invoked on the main thread – the same thread that shows the progress bar.

Any ideas?

    private SynchronizationContext context = SynchronizationContext.Current ?? new SynchronizationContext();
private Thread _serverThread = null;

public bool startServer()
    {

        if (_serverThread != null)
        {
            return false;
        }

        Server _Server = null;
        _Server = new Server();
        _Server.callback += new EventHandler(server_callback);

        return true;
    }


    void server_callback(object sender, EventArgs e)
    {
        ServerEventArgs types = e as ServerEventArgs;
        if (types != null)
        {
            context.Send(new SendOrPostCallback(processCommand), e);
        }

    }


    public void processCommand(Object o)
    {
        ServerEventArgs args = o as ServerEventArgs;
        if (args != null)
        {
            string input = args.command;
            string status = _revitWorker.ProcessCommand(app, input, true);

            statusUpdate(status);

            string output = _revitWorker.ProcessCommand(app, input, false);
            args.response = output;
        }
    }


    //update status
    private void statusUpdate(string status)
    {
        if (status == "disconnect")
        {
            disconnectFlag();
        }
        else if (status == "loading")
        {
            ProcessingFlag();
        }
        else
        {
            connectFlag();
        }
    }


    //disconnect
    public void disconnectFlag()
    {
        label1.Text = "disconnect";
        progressBar1.Visible = false;
    }


    //processing
    public void processingFlag()
    {
        label1.Text = "processing";
        progressBar1.Visible = true;    //progress bar appear only when loading
    }


    //connect
    public void connectFlag()
    {
        label1.Text = "ready";
        progressBar1.Visible = false;
    }

推荐答案

代替进度条使用可以使用ajax加载器（.gif）文件这样更容易。

instead of progress bar use can use ajax loaders (.gif) files this is easier.

你好，

你试过吗？

Hi,
Have you tried this.

//disconnect

public void SetStatusDelegate (bool state, string label);

public void disconnectFlag()
{
    new SetStatusDelegate(SetStatus).Invoke(false, "disconnect");
}


//processing
public void processingFlag()
{
    new SetStatusDelegate(SetStatus).Invoke(true, "processing");
    //progress bar appear only when loading
}


//connect
public void connectFlag()
{
    new SetStatusDelegate(SetStatus).Invoke(false, "ready");
}

private void SetStatus(bool status, string label)
{
    label1.Text = label;
    progressBar1.Visible = status;
}

问候

Jegan

Regards
Jegan

你好
这意味着你阻止了主线程。



试试这个：

Hi That means you are blocking the main thread.

Try this:

public bool startServer()
{
    if (_serverThread != null)
    {
        return false;
    }

    Task taskA = Task.Factory.StartNew(() => 
     { 
         Server _Server = null;
         _Server = new Server();
         _Server.callback += new EventHandler(server_callback);
     });

     return true;
}

任务工厂将保证启动一个单独的线程，我不确定你是否需要检查完全是_serverThread。



问候

Jegan

The Task factory will guarantee to start a separate thread, and I am not sure whether do you need to check the "_serverThread" at all.

Regards
Jegan

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