Uipath Studio Version: 2021.10.3
Language: C#

Objective: I need to create a new folder and subfolder at the same level of the inbox of a shared mailbox. I need to implement this solution with Uipath and Invoke code activity.

Chosen approach: I did not find any official activity in Uipath to achieve my goal, so I decided to develop it through Invoke Code.

Source: I used this script to create a folder because I want to implement it using Exchange server.
Authtenticate a EWS application by using OAuth

I already created the appId in our azure cloud.

Code created:

Main({sharedMailboxAddress,parentFolderName,childFolderName,appId});

class program
{
    static async System.Threading.Tasks.Task Main(string[] args)
            {
                // Using Microsoft.Identity.Client 4.22.0
            
                // Configure the MSAL client to get tokens
                var pcaOptions = new Microsoft.Identity.Client.PublicClientApplicationOptions
                {
                    // Client ID (also known as App ID) of the application as registered in the application registration porta
                   ClientId = args[4]
                };
              
               var pca = Microsoft.Identity.Client.PublicClientApplicationBuilder.CreateWithApplicationOptions(pcaOptions).Build();
            
               // The permission scope required for EWS access
               var ewsScopes = new string[] { "https://outlook.office365.com/EWS.AccessAsUser.All" };
                 
                try
                {
                    // Make the interactive token request
                    var authResult = await pca.AcquireTokenInteractive(ewsScopes).ExecuteAsync();
            
                    // Configure the ExchangeService with the access token
                    var ewsClient = new ExchangeService(ExchangeVersion.Exchange2013_SP1);
                    ewsClient.Url = new Uri("https://outlook.office365.com/EWS/Exchange.asmx");
                    ewsClient.Credentials = new OAuthCredentials(authResult.AccessToken);
                
                    FolderView fv = new FolderView(100);
                    
                    // Set Root from Shared Mailbox FolderId
                    System.Console.WriteLine(WellKnownFolderName.Root); 
                    FolderId SharedMailboxFolderId = new FolderId(WellKnownFolderName.Root, args[0]);
                    
                    // Set Parent FolderId
                    FolderId parentFolderID = null;
                    if(args[1]!="")
                    {
                        var findParentFolder = ewsClient.FindFolders(
                            SharedMailboxFolderId,
                            new SearchFilter.SearchFilterCollection(
                                Microsoft.Exchange.WebServices.Data.LogicalOperator.Or,
                                new SearchFilter.ContainsSubstring(FolderSchema.DisplayName, args[1])),
                            fv);
                        parentFolderID = findParentFolder.ElementAt(0).Id;
                        System.Console.WriteLine("Parent Folder exists");   
                    }
                    else
                    {
                        parentFolderID = SharedMailboxFolderId;
                    }
                    
                    var findChildFolder = ewsClient.FindFolders(
                            parentFolderID,
                             new SearchFilter.SearchFilterCollection(
                                Microsoft.Exchange.WebServices.Data.LogicalOperator.Or,
                                new SearchFilter.ContainsSubstring(FolderSchema.DisplayName, args[1])),
                            fv);
                        
                    FolderId childFolderID = findChildFolder.ElementAt(0).Id;
                    
                    //if child folder not found, create it
                    if (childFolderID == null)
                    {
                       //Source: https://learn.microsoft.com/en-us/previous-versions/office/developer/exchange-server-2010/dd633637(v=exchg.80)
                       // Create a generic folder with a valid ExchangeService object
                        Folder folder = new Folder(ewsClient);
                        // Set the folder properties
                        folder.DisplayName = args[3];
                        // Save the new folder in a specified parent folder.
                        folder.Save(parentFolderID);
                    }
                    else
                    {
                        System.Console.WriteLine($"Child Folder exists");   
                    }
                    
                }
                catch (Microsoft.Identity.Client.MsalException ex)
                {
                    System.Console.WriteLine("Error acquiring access token: {ex}");
                }
                catch (Exception ex)
                {
                   System.Console.WriteLine("Error: {ex}");
                }
                
        }   
}

Questions:

1. How to call the method Main in the Invoke code?
2. How to pass the arguments to this static method?. I created the arguments and those look like:

However, I do not really know how to pass them. That is why I created this code: Main({…}) but it does not work.

3. Should I add a namespace inside of the invoke code?
4. How do I retrieve the error from the catch block and assign it to the variable ‘Fehlermeldung’?