Removing unmanaged solutions via API

After some time, you will have multiple solutions in your CRM environment. In my case, there were multiple unmanaged solutions, as I have transferred many customizations between my test- and productive environment.

Via the solution menu in the settings, you can delete unused solutions, but only one after each other. This consumes much time and therefore I wrote a tool to delete unmanaged solutions, which were modified more than 1 month ago.

XmlConfigurator.Configure();
_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

using (var orgService = new CrmServiceClient(Connection)) // creating the client
{
    var query = new QueryExpression // creating the query
    {
        EntityName = "solution", // entity is solution
        ColumnSet = new ColumnSet("uniquename"),
        Criteria = new FilterExpression
        {
            Conditions =
            {
                new ConditionExpression("ismanaged", ConditionOperator.Equal,
                    false), // only getting unmanaged solutions
                new ConditionExpression("isvisible", ConditionOperator.Equal,
                    true), // only get visible solutions
                new ConditionExpression("uniquename", ConditionOperator.NotEqual,
                    "Default"), // exclude the default solution, which is also marked as unmanaged
                new ConditionExpression("modifiedon", ConditionOperator.LessThan,
                    DateTime.Now.AddMonths(-1)) // getting all solution, modified more than 1 month ago
            }
        }
    };

    var result = new ConcurrentBag<Entity>(orgService.RetrieveMultiple(query).Entities); // getting the result and add it to a threadsafe list

    
    Parallel.ForEach(
        result,
        new ParallelOptions {MaxDegreeOfParallelism = 4}, // using maximum parallelism of 4, as crm usually only allows 4 connections per ip
        solution =>
        {
            _log.Info($"Deleting solution {solution.GetAttributeValue<string>("uniquename")}"); // writing the solutionname to the log
            orgService.Delete(solution.LogicalName, solution.Id); // deleting the solution
        }
    );
}