c#+arcengine开发中，调用 融合gp工具处理数据，在最后释放gp工具中错误列表出现“System.InvalidCastException”类型异常 的错误 怎么解决

c#+arcengine开发中，调用 融合gp工具处理数据，在最后释放gp工具中错误列表出现“System.InvalidCastException”类型的第一次机会异常在 mscorlib.dll 中发生 的错误 怎么解决，虽然并没有影响程序运行，但是还是感觉会有问题，故求助：

  public  void FeatureDissolve(IFeatureLayer pGeoPolygonLayer, string pPath, string outFeatureClassName, string filedsName)

        {

            ESRI.ArcGIS.Geoprocessing.IGeoProcessorResult result = null;



            Geoprocessor gp = new Geoprocessor();

            gp.OverwriteOutput = true;

            

            ESRI.ArcGIS.DataManagementTools.Dissolve dissolve = new ESRI.ArcGIS.DataManagementTools.Dissolve();

            dissolve.in_features = pGeoPolygonLayer.FeatureClass;

            ESRI.ArcGIS.Geoprocessing.IGpValueTableObject pObject = new ESRI.ArcGIS.Geoprocessing.GpValueTableObjectClass();//对多个字段进行融合添加

            pObject.SetColumns(1);

            pObject.AddRow(filedsName);

            //pObject.AddRow("字段2");

            //pObject.AddRow("字段3");

            dissolve.dissolve_field = pObject;

            dissolve.multi_part = "SINGLE_PART";

            dissolve.unsplit_lines = "DISSOLVE_LINES";

            dissolve.statistics_fields = "";

            dissolve.out_feature_class = pPath + outFeatureClassName + ".shp";



            try

            {

                //gp.ExecuteAsync(dissolve);

                result = (ESRI.ArcGIS.Geoprocessing.IGeoProcessorResult)gp.Execute(dissolve, null);

            }

            catch (COMException e)

            {

                string message = "";

                for (int i = 0; i < gp.MessageCount; i++)

                {

                    message += gp.GetMessage(i) + "\r\n";

                }

                MessageBox.Show(message + e.ToString());

            }

            finally

            {

                while (result.Status != esriJobStatus.esriJobSucceeded)

                {

                    continue;

                }

                System.Runtime.InteropServices.Marshal.ReleaseComObject((object)result);

                System.Runtime.InteropServices.Marshal.ReleaseComObject((object)gp);

               

            }



        }

“System.InvalidCastException”类型的第一次机会异常在 mscorlib.dll 中发生

“System.ArgumentException”类型的第一次机会异常在 mscorlib.dll 中发生

“System.InvalidCastException”类型的第一次机会异常在 mscorlib.dll 中发生

“System.ArgumentException”类型的第一次机会异常在 mscorlib.dll 中发生