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我目前正在使用 ArcObects 10.2.1 进行开发，但遇到了这个棘手的异常：

遇到 AccessViolationException

尝试读取或写入受保护的内存。这通常表明其他内存已损坏。

源=System.Windows.Forms

堆栈跟踪：

   System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   System.Windows.Forms.NativeWindow.DefWndProc(Message& m)
   System.Windows.Forms.Control.DefWndProc(Message& m)
   System.Windows.Forms.Control.WndProc(Message& m)
   System.Windows.Forms.AxHost.WndProc(Message& m)
   System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

内部异常：

我尝试注释代码并找出错误的地方，我发现它在最后一行。但我仍然不知道如何解决它。

    public void SetSimpleLabel(IFeatureLayer featLayer, string field, string where = "")
    {
        IGeoFeatureLayer geoFeatureLayer = featLayer as IGeoFeatureLayer;
        IAnnotateLayerPropertiesCollection annoProperties = geoFeatureLayer.AnnotationProperties;
        annoProperties.Clear();

        ILineLabelPosition position = new LineLabelPosition();
        position.Parallel = true;
        position.Perpendicular = false;

        ILineLabelPlacementPriorities placement = new LineLabelPlacementPriorities();
        IBasicOverposterLayerProperties basic = new BasicOverposterLayerProperties();
        basic.FeatureType = esriBasicOverposterFeatureType.esriOverposterPoint;
        basic.LineLabelPlacementPriorities = placement;
        basic.LineLabelPosition = position;

        ILabelEngineLayerProperties labelProperties = new LabelEngineLayerProperties() as ILabelEngineLayerProperties;
        labelProperties.Symbol = sf.CreateTextSymbol(null, 12, null, null, esriTextHorizontalAlignment.esriTHACenter);
        labelProperties.BasicOverposterLayerProperties = basic;
        labelProperties.Expression = "[" + field + "]";
        IAnnotateLayerProperties annoLayerProperties = labelProperties as IAnnotateLayerProperties;
        if (where != "")
            annoLayerProperties.WhereClause = where;
        annoProperties.Add(annoLayerProperties);

        geoFeatureLayer.DisplayAnnotation = true; //it cause
    }

为什么会导致异常？有人有什么想法吗？

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