Dynamics 365 Plugin for lookup values

Question

Error: 0x80040203 Invalid Argument

I'm new to Dynamics. In preparation for getting lookup values from external data source into Dynamics via a plugin, I wanted to test first with hard coded values with this code. But after I registered the assembly, data provider and data source, I created a virtual entity in dynamics which I linked up to a field (lookup type) on a form. After publishing, clicking on the field throws error - Invalid Argument

using System;
using Microsoft.Xrm.Sdk;

namespace Hardcoded.Names.Plugin
{
public class NamesLookupPlugin : IPlugin
{
    public void Execute(IServiceProvider serviceProvider)
    {
        var context = (IPluginExecutionContext)serviceProvider.GetService(typeof(IPluginExecutionContext));
        var serviceFactory = (IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));
        serviceFactory.CreateOrganizationService(context.UserId);
        var tracingService = (ITracingService)serviceProvider.GetService(typeof(ITracingService));

        try
        {
            var results = new EntityCollection();
            var itemOne = new Entity
            {
                ["ID"] = Guid.NewGuid(),
                ["Name"] = "First Item"
            };

            var itemTwo = new Entity()
            {
                ["ID"] = Guid.NewGuid(),
                ["Name"] = "Second Item"
            };
            results.Entities.Add(itemOne);
            results.Entities.Add(itemTwo);

            context.OutputParameters["BusinessEntityCollection"] = results;
        }
        catch (Exception e)
        {
            tracingService.Trace($"{e.Message} {e.StackTrace}");
            if (e.InnerException != null)
                tracingService.Trace($"{e.InnerException.Message} {e.InnerException.StackTrace}");

            throw new InvalidPluginExecutionException(e.Message);
        }
     }
   }
}

I expect to see "First Item" and "Second Item" selectable in the lookup field.

Are you trying to add data into virtual Entity and your data has Lookup? — AnkUser
That's correct. Eventually, the data will come from external source but for now, it's hard coded in the plug-in. — Abiy
If I understand correctly, You cannot directly create Lookup when creating a Virtual Entity Record. I mean what does lookup means, It means a Record from some other table and then linking it. So I believe first this Lookup record should be available in System and Then you can show that as lookup.You probably already know but still here is a reference link how lookup is referenced blogs.technet.microsoft.com/lystavlen/2017/11/10/… — AnkUser
basically, this is what I wanted to do: docs.microsoft.com/en-us/dynamics365/customer-engagement/… except, hard coded values for now instead of from DropBox — Abiy

Ondrej Svejdar Ondrej Svejdar · Accepted Answer · 2019-04-05T07:27:22

You’re hooking on RetrieveMultiple message in your plug-in. There is also Retrieve message (get single record by EntityReference) - you need to hook on that message as well for your entity.

Dynamics 365 Plugin for lookup values

1 Answers