尝试以编程方式执行SSIS包时，找不到SSISDB目录

所以在过去的两天里，我一直在尝试从SharePoint事件接收器执行SSIS包，结果几乎疯了。

SSIS包部署到我的开发环境中的Integration Service Catalogs中（SQL Server 2014及其Integration Services与SharePoint Server和我的VS2013 Community Edition安装在同一台计算机上）。从SSMS 成功打开SSISDB目录

到目前为止，这是我的代码，基本上遵循本博客中的步骤->http://microsoft-ssis.blogspot.co.id/2013/01/call-ssis-2012-package-within-net.html

connString = @"Data Source=PIRSRV03;Initial Catalog=master;Integrated Security=SSPI;";
                using (SqlConnection sqlConnection = new SqlConnection(connString))
                {
                    IntegrationServices integrationServices = new IntegrationServices(sqlConnection);
                    PackageInfo myPackage = integrationServices.Catalogs[integrationServiceCatalog].Folders[integrationServiceFolder].Projects[integrationServiceProject].Packages[integrationServicePackage];
                    Collection<PackageInfo.ExecutionValueParameterSet> executionValueParameterSet = new Collection<PackageInfo.ExecutionValueParameterSet>();
                    executionValueParameterSet.Add(new
                    PackageInfo.ExecutionValueParameterSet { ParameterName = "ExcelFilePath", ParameterValue = TempDirectory, ObjectType = 30 });
                    long executionIdentifier = myPackage.Execute(false, null, executionValueParameterSet);
                    ExecutionOperation executionOperation = integrationServices.Catalogs["SSISDB"].Executions[executionIdentifier];
                    // Workaround for 30 second timeout:
                    // Loop while the execution is not completed
                    while (!(executionOperation.Completed))
                    {
                        // Refresh execution info
                        executionOperation.Refresh();
                        // Wait 5 seconds before refreshing (we don't want to stress the server)
                        System.Threading.Thread.Sleep(5000);
                    } 
                }

一切都很好，直到它访问目录SSISDB并抛出错误的代码行，经过一个小的调试会话，我通过观察Catalogs.Count属性发现integrationServices对象没有任何目录，在本例中该属性等于零。

有什么线索表明为什么会发生这种情况吗？

任何帮助都将不胜感激，谢谢！