Executing a site workflow in sharepoint from a console application - sharepoint

Question

I am trying to execute a site workflow from a console application.When the code to execute the workflow runs, it thows an error
An unhandled exception of type 'Microsoft.SharePoint.Client.ServerException' occurred in Microsoft.SharePoint.Client.Runtime.dll
Additional information:
Cannot invoke method or retrieve property from null object. Object returned by the following call stack is null. "GetWorkflowInteropService new Microsoft.SharePoint.WorkflowServices.WorkflowServicesManager()"
string userName = "username";
string password = "password";
string siteUrl = "https://share.example.com/sites/workflowsite";
string workflowName = "MyWorkflow";
using (ClientContext clientContext = new ClientContext(siteUrl))
{
SecureString securePassword = new SecureString();
foreach (char c in password.ToCharArray()) securePassword.AppendChar(c);
clientContext.Credentials = new NetworkCredential(userName, securePassword);
Web web = clientContext.Web;
WorkflowAssociationCollection wfAssociations = web.WorkflowAssociations;
WorkflowAssociation wfAssociation = wfAssociations.GetByName(workflowName);
clientContext.Load(wfAssociation);
clientContext.ExecuteQuery();
WorkflowServicesManager manager = new WorkflowServicesManager(clientContext, web);
InteropService workflowInteropService = manager.GetWorkflowInteropService();
clientContext.Load(workflowInteropService);
clientContext.ExecuteQuery();
workflowInteropService.StartWorkflow(wfAssociation.Name, new Guid(), Guid.Empty, Guid.Empty, null);
clientContext.ExecuteQuery(
}

Answer 1

The code below for your reference:
using Microsoft.SharePoint.Client;
using Microsoft.SharePoint.Client.WorkflowServices;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Security;
using System.Text;
using System.Threading.Tasks;
namespace CSOMStartWorkflow {
class Program {
static void Main(string[] args) {
Console.WriteLine("Enter the Office 365 Login Name");
string loginId = Console.ReadLine();
string pwd = GetInput("Password", true);
Console.WriteLine("Web Url:");
string webUrl = Console.ReadLine();
Console.WriteLine("List Name:");
string listName = Console.ReadLine();
Console.WriteLine("Workflow Name");
string workflowName = Console.ReadLine();
var passWord = new SecureString();
foreach (char c in pwd.ToCharArray()) passWord.AppendChar(c);
using (var ctx = new ClientContext(webUrl)) {
ctx.Credentials = new SharePointOnlineCredentials(loginId, passWord);
var workflowServicesManager = new WorkflowServicesManager(ctx, ctx.Web);
var workflowInteropService = workflowServicesManager.GetWorkflowInteropService();
var workflowSubscriptionService = workflowServicesManager.GetWorkflowSubscriptionService();
var workflowDeploymentService = workflowServicesManager.GetWorkflowDeploymentService();
var workflowInstanceService = workflowServicesManager.GetWorkflowInstanceService();
var publishedWorkflowDefinitions = workflowDeploymentService.EnumerateDefinitions(true);
ctx.Load(publishedWorkflowDefinitions);
ctx.ExecuteQuery();
var def = from defs in publishedWorkflowDefinitions
where defs.DisplayName == workflowName
select defs;
WorkflowDefinition workflow = def.FirstOrDefault();
if(workflow != null) {
// get all workflow associations
var workflowAssociations = workflowSubscriptionService.EnumerateSubscriptionsByDefinition(workflow.Id);
ctx.Load(workflowAssociations);
ctx.ExecuteQuery();
// find the first association
var firstWorkflowAssociation = workflowAssociations.First();
// start the workflow
var startParameters = new Dictionary<string, object>();
if (ctx.Web.ListExists(listName)) {
List list = ctx.Web.GetListByTitle(listName);
CamlQuery query = CamlQuery.CreateAllItemsQuery();
ListItemCollection items = list.GetItems(query);
// Retrieve all items in the ListItemCollection from List.GetItems(Query).
ctx.Load(items);
ctx.ExecuteQuery();
foreach (ListItem listItem in items) {
Console.WriteLine("Starting workflow for item: " + listItem.Id);
workflowInstanceService.StartWorkflowOnListItem(firstWorkflowAssociation, listItem.Id, startParameters);
ctx.ExecuteQuery();
}
}
}
}
Console.WriteLine("Press any key to close....");
Console.ReadKey();
}
private static string GetInput(string label, bool isPassword) {
Console.ForegroundColor = ConsoleColor.White;
Console.Write("{0} : ", label);
Console.ForegroundColor = ConsoleColor.Gray;
string strPwd = "";
for (ConsoleKeyInfo keyInfo = Console.ReadKey(true); keyInfo.Key != ConsoleKey.Enter; keyInfo = Console.ReadKey(true)) {
if (keyInfo.Key == ConsoleKey.Backspace) {
if (strPwd.Length > 0) {
strPwd = strPwd.Remove(strPwd.Length - 1);
Console.SetCursorPosition(Console.CursorLeft - 1, Console.CursorTop);
Console.Write(" ");
Console.SetCursorPosition(Console.CursorLeft - 1, Console.CursorTop);
}
} else if (keyInfo.Key != ConsoleKey.Enter) {
if (isPassword) {
Console.Write("*");
} else {
Console.Write(keyInfo.KeyChar);
}
strPwd += keyInfo.KeyChar;
}
}
Console.WriteLine("");
return strPwd;
}
}
}
Reference: Starting a SharePoint Online Workflow with the Client Side Object Model (CSOM)