.NET

[#1]

    dynamic AutoCAD = AutomationFactory.CreateObject("AutoCAD.Application");
            //dynamic aCADutil = AutoCAD.Utility;
            AutoCAD.Visible = true;
            //dynamic mospace = AutoCAD.ModelSpace;
             dynamic doc = AutoCAD.ActiveDocument;
        
             doc.Open("D:\\2Dsample1.dwg");

errorystem.Runtime.InteropServices.COMException (0x80210070): 發生例外狀況於 HRESULT: 0x80210070 ---> MS.Internal.ComAutomation.ComAutomationObjectException: 發生例外狀況於 HRESULT: 0x80210070
(Source=AutoCAD)
(HelpFile=C:\Program Files (x86)\AutoCAD 2008\HELP\OLE_ERR.CHM#2149646448)
   於 MS.Internal.ComAutomation.ComAutomationNative.CheckInvokeHResult(UInt32 hr, String memberName, String exceptionSource, String exceptionDescription, String exceptionHelpFile, UInt32 exceptionHelpContext)
   於 MS.Internal.ComAutomation.ComAutomationNative.Invoke(Boolean tryInvoke, String memberName, ComAutomationInvokeType invokeType, ComAutomationInteropValue[] rgParams, IntPtr nativePeer, ComAutomationInteropValue& returnValue)
   於 MS.Internal.ComAutomation.ComAutomationObject.InvokeImpl(Boolean tryInvoke, String name, ComAutomationInvokeType invokeType, Object& returnValue, Object[] args)
   於 MS.Internal.ComAutomation.ComAutomationObject.Invoke(String name, ComAutomationInvokeType invokeType, Object[] args)
   於 System.Runtime.InteropServices.Automation.AutomationMetaObjectProvider.TryInvokeMember(InvokeMemberBinder binder, Object[] args, Object& result)
   於 System.Runtime.InteropServices.Automation.AutomationMetaObjectProviderBase.<.cctor>b__4(Object obj, InvokeMemberBinder binder, Object[] args)
   於 CallSite.Target(Closure , CallSite , Object , String )
   於 System.Dynamic.UpdateDelegates.UpdateAndExecuteVoid2[T0,T1](CallSite site, T0 arg0, T1 arg1)
   於 SilverlightOOBDemo.OutofBrowserMainPage.wordBtn_Click(Object sender, RoutedEventArgs e)
   於 System.Windows.Controls.Primitives.ButtonBase.OnClick()
   於 System.Windows.Controls.Button.OnClick()
   於 System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
   於 System.Windows.Controls.Control.OnMouseLeftButtonUp(Control ctrl, EventArgs e)
   於 MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName, UInt32 flags)}

[#2]

You did not say, but I assume it is the last line of code you showed that causes the error:

doc.Open(....).

That is, you try to open a drawing document in SDI mode.

By default, AutoCAD is in MDI mode (it is very rare by now that someone still use AutoCAD in SDI mode). In MDI mode, AcadDocument.Open() cannot be called.

You should:

autoCAD.Visible=true;

dynamic doc=autoCAD.Documents.Open([path/name]);

//Then dosomething with doc object.