Activity Party

 using Microsoft.Xrm.Sdk;

using Microsoft.Xrm.Sdk.Query;

using System;

using System.Collections.Generic;

public class RetrieveActivityParty

{

    private readonly IOrganizationService _service;

    public RetrieveActivityParty(IOrganizationService service)

    {

        _service = service;

    }

    public void GetActivityParties(Guid activityId)

    {

        QueryExpression query = new QueryExpression("activityparty")

        {

            ColumnSet = new ColumnSet("partyid", "participationtypemask")

        };

        query.Criteria.AddCondition("activityid", ConditionOperator.Equal, activityId);

        EntityCollection results = _service.RetrieveMultiple(query);

        foreach (Entity activityParty in results.Entities)

        {

            EntityReference party = activityParty.GetAttributeValue<EntityReference>("partyid");

            int participationType = activityParty.GetAttributeValue<OptionSetValue>("participationtypemask")?.Value ?? 0;

            Console.WriteLine($"Party ID: {party?.Id}, Type: {party?.LogicalName}, Participation Type: {participationType}");

        }

    }

}

---------

string fetchXml = $@"

    <fetch>

        <entity name='activityparty'>

            <attribute name='partyid' />

            <attribute name='participationtypemask' />

            <filter>

                <condition attribute='activityid' operator='eq' value='{activityId}' />

            </filter>

        </entity>

    </fetch>";

EntityCollection results = _service.RetrieveMultiple(new FetchExpression(fetchXml));

-------

Slpit-string

using System;

using System.Text.RegularExpressions;

class Program

{

    static void Main()

    {

        string url = "https://example.com/a-guid/b-guid/c-guid/d.anyextension";

        

        if (TryExtractFields(url, out string fieldA, out string fieldBC))

        {

            Console.WriteLine($"a: {fieldA}");

            Console.WriteLine($"b/c: {fieldBC}");

        }

        else

        {

            Console.WriteLine("Invalid URL format.");

        }

    }

    static bool TryExtractFields(string url, out string fieldA, out string fieldBC)

    {

        fieldA = string.Empty;

        fieldBC = string.Empty;

        // Regex to match: https://{domain}/{guid}/{guid}/{guid}/filename.anyextension

        Regex regex = new Regex(@"^https://[^/]+/([0-9a-fA-F-]{36})/([0-9a-fA-F-]{36})/([0-9a-fA-F-]{36})/[^/]+\.[a-zA-Z0-9]+$");

        Match match = regex.Match(url);

        if (match.Success)

        {

            fieldA = match.Groups[1].Value;   // Extract GUID 'a'

            fieldBC = $"{match.Groups[2].Value}/{match.Groups[3].Value}";  // Extract 'b/c' as "b-guid/c-guid"

            return true;

        }

        return false;

    }

}