非法跨线程操作异常，无法处理它

我正在使用Visual C＃express 2008.我有时在我的调用方法中获取非法跨线程操作，当我尝试运行我的项目。它在许多地方使用相同的invoke方法，但它只在另一个线程的开始处出现错误。我检查InvokeRequired属性，调用相同的方法并在'else'条件中创建一个临时变量并为其分配我的控件文本。但在这一行上，在'else'语句中，在调用方法中，我有时会得到异常。可能是什么原因？如何摆脱它？它不经常发生，但它仍然是一个错误。非法跨线程操作异常，无法处理它

代码：

// 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. 
     // ... 
    } 
}

堆栈跟踪：

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:

来源

2010-03-31 yeah1000

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

这个问题似乎是，你想从一个非UI线程访问Windows控件属性。相反，尝试使用Invoke从控件中获取文本长度。

来源

2010-03-31 16:58:11

非法跨线程操作异常，无法处理它

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