c# – WPF,TPL,生产者/消费者模式 – 错误的线程错误

我是TPL和WPf的新手,有以下问题.
我尝试在无限循环中下载一个站点(这里只是for循环)和
将其添加到队列中.下一个任务将其取出并在Textblock中显示.
但是我似乎没有为UI获得正确的线程,尽管我认为我正确地使用了TaskScheduler.

感谢您的任何帮助！

BlockingCollection<string> blockingCollection = new BlockingCollection<string>();
CancellationToken token = tokenSource.Token;
TaskScheduler uiScheduler = TaskScheduler.FromCurrentSynchronizationContext();

        Task task1 = new Task(
            (obj) =>
            {
                for (int i = 0; i < 10; i++)
                {
                    if (token.IsCancellationRequested)
                    {
                        TxtBlock2.Text = "Task cancel detected";
                        throw new OperationCanceledException(token);
                    }
                    else
                    {
                        string code = i.ToString() + "t" + AsyncHttpReq.get_source_WebRequest(uri);
                        blockingCollection.Add(code);
                    }
                }
            },TaskScheduler.Default);


        task1.ContinueWith(antecedents =>
        {
            TxtBlock2.Text = "Signalling production end";
            blockingCollection.CompleteAdding();
        },uiScheduler);


        Task taskCP = new Task(
            (obj) =>
            {
                while (!blockingCollection.IsCompleted)
                {
                    string dlCode;
                    if (blockingCollection.TryTake(out dlCode))
                    {
     //the calling thread cannot access this object because a different thread owns it.
                        TxtBlock3.Text = dlCode;  
                    }
                }
            },uiScheduler);


WindowsBase.dll!System.Windows.Threading.Dispatcher.VerifyAccess() + 0x4a bytes 
WindowsBase.dll!System.Windows.DependencyObject.SetValue(System.Windows.DependencyProperty dp,object value) + 0x19 bytes   
PresentationFramework.dll!System.Windows.Controls.TextBlock.Text.set(string value) + 0x24 bytes

WpfRibbonApplication4.exe!WpfRibbonApplication4.MainWindow.Button1_Click.AnonymousMethod__4(object obj) Line 83 + 0x16 bytes C#
mscorlib.dll!System.Threading.Tasks.Task.InnerInvoke() + 0x44 bytes
mscorlib.dll!System.Threading.Tasks.Task.Execute() + 0x43 bytes
mscorlib.dll!System.Threading.Tasks.Task.ExecutionContextCallback(object obj) + 0x27 bytes
mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext,System.Threading.ContextCallback callback,object state,bool ignoreSyncCtx) + 0xb0 bytes
mscorlib.dll!System.Threading.Tasks.Task.ExecuteWithThreadLocal(ref System.Threading.Tasks.Task currentTaskSlot) + 0x154 bytes
mscorlib.dll!System.Threading.Tasks.Task.ExecuteEntry(bool bPreventDoubleExecution) + 0x8b bytes
mscorlib.dll!System.Threading.Tasks.Task.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem() + 0x7 bytes
mscorlib.dll!System.Threading.ThreadPoolWorkQueue.Dispatch() + 0x147 bytes
mscorlib.dll!System.Threading._ThreadPoolWaitCallback.PerformWaitCallback() + 0x2d bytes
[Native to Managed Transition]

System.InvalidOperationException was unhandled by user code
  Message=The calling thread cannot access this object because a different thread owns it.
  Source=WindowsBase
  StackTrace:
       at System.Windows.Threading.Dispatcher.VerifyAccess()
       at System.Windows.DependencyObject.SetValue(DependencyProperty dp,Object value)
       at System.Windows.Controls.TextBlock.set_Text(String value)
       at WpfRibbonApplication4.MainWindow.<>c__DisplayClass5.<Button1_Click>b__3(Object o) in C: ... WpfRibbonApplication4WpfRibbonApplication4MainWindow.xaml.cs:line 90
       at System.Threading.Tasks.Task.InnerInvoke()
       at System.Threading.Tasks.Task.Execute()
  InnerException:

谢谢你的所有帮助.
我还有两个问题：
我用Task.Factory.StartNew重写了我的代码.但是我的Task2似乎会引起问题.没有错误消息.看起来很像一个紧凑的循环.当然,我没弄清楚为什么？
你会这么善良并再次指出我正确的方向吗？
请记住,我已经做了大约6个月的C#和一周的TPL,否则我不会再问你了.但凭借这些经验……
再次感谢你！

Brians代码：

var task1 = new Task( 
  (obj) =>

为什么需要obj？

private void Button1_Click(object sender,RoutedEventArgs e)
        {

TaskScheduler uiTaskScheduler = TaskScheduler.FromCurrentSynchronizationContext();
????????????????BlockingCollection blockingCollection = new BlockingCollection();
????????????????CancellationTokenSource cts = new CancellationTokenSource();

CancellationToken token = cts.Token;

            Task task1 = Task.Factory.StartNew(
                () =>
                {
                    for (int i = 0; i < 10 ; i++)
                    {
                        token.ThrowIfCancellationRequested();
                        string code = i++.ToString() + "t" + AsyncHttpReq.get_source_WebRequest(uriDE);
                        blockingCollection.Add(code);
                    }
                },token,TaskCreationOptions.None,TaskScheduler.Default);

            task1.ContinueWith(
                (antecedents) =>
                {
                    if (token.IsCancellationRequested)
                    {
                        TxtBlock2.Text = "Task cancel detected"; 
                    }
                    else 
                    { 
                        TxtBlock2.Text = "Signalling production end"; 
                    }

                    blockingCollection.CompleteAdding();

                },uiTaskScheduler);


            Task task2 = Task.Factory.StartNew(
                () =>
                {
                    while (!blockingCollection.IsCompleted)
                    {
                        string dlcode;

                        if (blockingCollection.TryTake(out dlcode))
                        {
                            TxtBlock3.Text = dlcode;
                        }
                    }

                },uiTaskScheduler);

        }

taskCP.Start(uiTaskScheduler);