C＃后期绑定命令COM obj命令由于所需的回写设置而失败

Question

我知道我应该在Vb.net中编写此代码，但是由于我自己的原因，我试图在C＃.net Framework 3.5中晚对Com对象进行绑定。 我得到的错误是“ DISP_E_BADCALLEE”，而我仅根据将所需的复本设置为true时得到此错误。 我正在处理安全问题吗？ 我的研究使我尝试在AssemblyInfo文件中删除“ [assembly：AllowPartiallyTrustedCallers（）]”，但没有成功。 我在下面的代码精简版中删除了一些详细信息。 第四步失败。 多谢您的协助。 谢谢。

                //step 1
        _atlDirectorObject = Activator.CreateInstance(Type.GetTypeFromProgID("atlDirectorObject.atlDirector"));
        //step 2
        object[] parms = { "3270", 1, true, true, 0, _atl3270Tool, _ErrMsg };
        Boolean[] CopyBack2 = new Boolean[7];
        CopyBack2[5] = true;  //atl3270Tool
        CopyBack2[6] = true;  //ErrMsg

        Microsoft.VisualBasic.CompilerServices.NewLateBinding.LateCall(_atlDirectorObject, _atlDirectorObject.GetType(), "CreateTool", parms, null, null, CopyBack2, false);
        _atl3270Tool = parms[5];


        //step 3
        // now using _atl3270Tool we navigate mainframe screens
        object[] parms3 = { Screen, SubScreen, _Number, _ErrMsg };
        Microsoft.VisualBasic.CompilerServices.NewLateBinding.LateCall(_atl3270Tool, _atl3270Tool.GetType(), "ShowScreen", parms3, null, null, null, false);

        //>>>>>>>>>>>>>>CODE FAILS ON THIS STEP<<<<<<<<<<<<
        //step 4
        Boolean[] CopyBack4 = new Boolean[5];
        CopyBack4[3] = true; //screentext
        CopyBack4[4] = true; //_errmsg
        object ScreenText = String.Empty;
        object[] parms4 = { Row, Col, Length, ScreenText, _ErrMsg};
        Microsoft.VisualBasic.CompilerServices.NewLateBinding.LateCall(_atl3270Tool, _atl3270Tool.GetType(), "ReadScreen", parms4, null, null, CopyBack4, false)

        // if it were working the code would read screen data into parms4[3] object
        // If CopyBack4[3 and/or 4] are set to true = error 
        // Is just CopyBack4[0,1,2] are true = no error but no result           
        //Errors out with "Invalid callee. (Exception from HRESULT: 0x80020010 (DISP_E_BADCALLEE))"


        return Convert.ToString(parms4[3]);

Answer 1

ScreenText应该设置为null，而不是string.empty