嘗試更新wpf中的文本框時UI會凍結

我有一個代碼，它有一個文本框和一個按鈕，當我按下按鈕時，代碼更新文本框，並且在單詞睡眠5秒後，被凍結我試圖與代表，和線程但沒有任何工程這是代表代碼：嘗試更新wpf中的文本框時UI會凍結

MainWindow.vb

Class MainWindow 
    Delegate Sub MySubDelegate(ByVal x As String) 
    Private m_engine As Engine 

    Public Sub New() 
     m_engine = New Engine(AddressOf WriteToLog) 
     InitializeComponent() 
     Me.DataContext = m_engine.GetViewModel() 

    End Sub 

    Public Sub WriteToLog(str As String) 
     Dim vv As ViewModel = CType(DataContext, ViewModel) 
     vv.Log = str 
    End Sub 

    Private Sub clicked(sender As Object, e As RoutedEventArgs) 
     m_engine.TimingRecord() 
    End Sub 
End Class

Engine.vb

Private m_viewModel As New ViewModel 
Private _msd As MainWindow.MySubDelegate 

Public Sub New() 

End Sub 

Sub New(msd As MainWindow.MySubDelegate) 
    _msd = msd 
End Sub 

Public Function GetViewModel() As ViewModel 
    Return m_viewModel 
End Function 

Public Sub TimingRecord()   
    _msd("aaaaa") 
    SetText() 
End Sub 


Public Sub SetText() 
    Thread.Sleep(5000) 
End Sub

viewModel.vb

Public Class ViewModel 
    Implements INotifyPropertyChanged 
    Private m_log As String 
    Public Property Log As String 
     Get 
      Return m_log 
     End Get 
     Set(value As String) 
      m_log = value 
     End Set 
    End Property 
    Public Event PropertyChanged(sender As Object, e As PropertyChangedEventArgs) Implements INotifyPropertyChanged.PropertyChanged 
    Private Sub NotifyPropertyChanged(Optional ByVal propertyName As String = Nothing) 
      RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(propertyName)) 
    End Sub 
End Class

這與線程的代碼：

MainWindow.vb

Delegate Sub MySubDelegate(ByVal x As String) 
Private m_engine As Engine 

Public Sub New() 
    m_engine = New Engine(AddressOf WriteToLog) 
    InitializeComponent() 
    Me.DataContext = m_engine.GetViewModel() 

End Sub 

Public Sub WriteToLog(str As String) 
    Me.Dispatcher.Invoke(Sub() CType(DataContext, ViewModel).Log = str) 
    'Dim vv As ViewModel = CType(DataContext, ViewModel) 
    'vv.Log = str 
End Sub 

Private Sub clicked(sender As Object, e As RoutedEventArgs) 
    m_engine.TimingRecord() 
End Sub

Engine.vb

Public Class Engine 
    Private m_viewModel As New ViewModel  
    Private m_thread As Thread 
    Private _msd As MainWindow.MySubDelegate 

    Public Sub New(msd As MainWindow.MySubDelegate) 
     _msd = msd 
    End Sub 

    Public Function GetViewModel() As ViewModel 
     Return m_viewModel 
    End Function 

    Public Sub TimingRecord() 
     m_thread = New Thread(AddressOf DoRecordThread) 
     m_thread.IsBackground = True 
     m_thread.Start("aa") 
     SetText() 
    End Sub 

    Public Sub SetText() 
     Thread.Sleep(5000) 
    End Sub 

    Private Sub DoRecordThread(str As String) 
     _msd(str) 
     'm_viewModel.Log = str 
    End Sub 
End Class

視圖模型保持不變。我使用wpf，因此我將日誌綁定到文本框中，並使用簡單的代碼工作。

謝謝大家提前。

來源

2016-02-18 Joe

'SLEEP'導致你的線程好，睡吧。如果線程是你的用戶界面，那麼它就完全按照你所說的去做。 – Steve

你爲什麼要做'Thread.Sleep（5000）'？ – Enigmativity

謝謝你的回覆，thread.sleep來代替一個很長的運行，從1到100000000，我把睡眠放在新的線程裏面，用戶界面沒有凍結，但是他的文本框沒有更新，你能幫我嗎 – Joe

Thread.Sleep導致該問題。它會阻止使UI凍結的UI線程。

在不同的線程中執行長時間運行的任務，並且一旦完成更新UI（TextBox）與Application.Current.Dispatcher。

示例代碼與Dispatcher更新從後臺線程的UI：

Application.Current.Dispatcher.Invoke(new Action(() => { Textbox1.Text = result; }))

這不是一個正確的做法，但我希望這是你在找什麼。

更新

此外，還有另一種方式，你可以使用內置BackgroundWorker。

//Add the namespace 
using System.ComponentModel; 

//Declare 
private readonly BackgroundWorker worker = new BackgroundWorker(); 

//Initialize 
worker.DoWork += worker_DoWork; 
worker.ProgressChanged += worker_ProgressChanged; 
worker.RunWorkerCompleted += worker_RunWorkerCompleted; 


//method declaration 
private void worker_DoWork(object sender, DoWorkEventArgs e) 
{ 
    worker.ReportProgress(0, "Process started"); 
    // run all background tasks here 
} 

private void worker_ProgressChanged(object sender, ProgressChangedEventArgs e) 
{ 
    //Progress update with e.UserState.ToString(); 
} 

private void worker_RunWorkerCompleted(object sender, 
             RunWorkerCompletedEventArgs e) 
{ 
    //update ui once worker complete his work 
} 

//Invoke 
worker.RunWorkerAsync();

來源

2016-02-19 07:12:42 Gopichandar

是的將thread.sleep放入新線程中可以解決凍結問題，但文本不會更新，並且我希望在長時間運行之前寫入文本的可能性（如將「啓動進程」寫入日誌文本框） – Joe

你可以在新的線程裏面添加代碼'Application.Current.Dispatcher.Invoke（new Action（（）=> {Textbox1.Text = result;}））''來更新文本。 – Gopichandar

@Joe。。看到我更新的答案。。 – Gopichandar

通過放了Thread.Sleep但在視圖模型類的我不小心刪除了，現在更改屬性，它正在完美非常愚蠢的我解決的問題謝謝大家的幫助

來源

2016-02-19 07:58:25 Joe

嘗試更新wpf中的文本框時UI會凍結

回答

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