非法跨線程操作異常，無法處理它

我正在使用Visual C＃express 2008.我有時在我的調用方法中獲取非法跨線程操作，當我嘗試運行我的項目。它在許多地方使用相同的invoke方法，但它只在另一個線程的開始處出現錯誤。我檢查InvokeRequired屬性，調用相同的方法並在'else'條件中創建一個臨時變量併爲其分配我的控件文本。但在這一行上，在'else'語句中，在調用方法中，我有時會得到異常。可能是什麼原因？如何擺脫它？它不經常發生，但它仍然是一個錯誤。非法跨線程操作異常，無法處理它

代碼：

// Delegate: 
private delegate void ChangeTextDelegate(string text); 

// Method: 
public static void ChangeText(string text) 
{ 
    if (richtextbox1.InvokeRequired) 
    { 
     richtextbox1.Invoke(new ChangeTextDelegate(ChangeText), new object[] { text }); 
    } 
    else 
    { 
     int startIndex; 
     startIndex = richtextbox1.TextLength; // <- Exception points here. 
     // ... 
    } 
}

堆棧跟蹤：

System.InvalidOperationException was unhandled 
    Message="Cross-thread operation not valid: Control 'SomeClass' accessed from a thread other than the thread it was created on." 
    Source="System.Windows.Forms" 
    StackTrace: 
     at System.Windows.Forms.Control.get_Handle() 
     at System.Windows.Forms.Control.get_InternalHandle() 
     at System.Windows.Forms.Control.WmWindowPosChanged(Message& m) 
     at System.Windows.Forms.Control.WndProc(Message& m) 
     at System.Windows.Forms.TextBoxBase.WndProc(Message& m) 
     at System.Windows.Forms.RichTextBox.WndProc(Message& m) 
     at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) 
     at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) 
     at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) 
     at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam) 
     at System.Windows.Forms.NativeWindow.DefWndProc(Message& m) 
     at System.Windows.Forms.Control.DefWndProc(Message& m) 
     at System.Windows.Forms.Control.WmCreate(Message& m) 
     at System.Windows.Forms.Control.WndProc(Message& m) 
     at System.Windows.Forms.TextBoxBase.WndProc(Message& m) 
     at System.Windows.Forms.RichTextBox.WndProc(Message& m) 
     at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) 
     at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) 
     at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) 
     at System.Windows.Forms.UnsafeNativeMethods.IntCreateWindowEx(Int32 dwExStyle, String lpszClassName, String lpszWindowName, Int32 style, Int32 x, Int32 y, Int32 width, Int32 height, HandleRef hWndParent, HandleRef hMenu, HandleRef hInst, Object pvParam) 
     at System.Windows.Forms.UnsafeNativeMethods.CreateWindowEx(Int32 dwExStyle, String lpszClassName, String lpszWindowName, Int32 style, Int32 x, Int32 y, Int32 width, Int32 height, HandleRef hWndParent, HandleRef hMenu, HandleRef hInst, Object pvParam) 
     at System.Windows.Forms.NativeWindow.CreateHandle(CreateParams cp) 
     at System.Windows.Forms.Control.CreateHandle() 
     at System.Windows.Forms.TextBoxBase.CreateHandle() 
     at System.Windows.Forms.Control.get_Handle() 
     at System.Windows.Forms.RichTextBox.get_TextLength() 
     at SomeNamespace.SomeClass.Changetext(String text, Color color) in C:\...\SomeClass.cs:line 827 
     at SomeNamespace.SomeClass.SomeThreadFun() in C:\...\SomeClass.cs:line 112 
     at System.Threading.ThreadHelper.ThreadStart_Context(Object state) 
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) 
     at System.Threading.ThreadHelper.ThreadStart() 
    InnerException:

來源

2010-03-31 yeah1000

類似但不一定重複：http://stackoverflow.com/questions/1954140/getting-cross-thread-operation-not-valid-even-when-using-invoke-method – 2010-03-31 16:55:33

這個問題似乎是，你想從一個非UI線程訪問Windows控件屬性。相反，嘗試使用Invoke從控件中獲取文本長度。

來源

2010-03-31 16:58:11

非法跨線程操作異常，無法處理它

回答

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