CRM Plugin sample code get/check user in specific role

UserInFrozenRole.cs

 private static bool UserInFrozenRole(IPluginExecutionContext context, IOrganizationService organizationService, IEnumerable<string> settingRoles)
        {
            var jjQuery = new QueryExpression()
            {
                EntityName = "role",
                ColumnSet = new ColumnSet("name"),
                LinkEntities =
                {
                    new LinkEntity
                    {
                        LinkFromEntityName = Role.EntityLogicalName,
                        LinkFromAttributeName = "roleid",
                        LinkToEntityName = SystemUserRoles.EntityLogicalName,
                        LinkToAttributeName = "roleid",
                        LinkCriteria = new FilterExpression
                        {
                            FilterOperator = LogicalOperator.And,
                            Conditions =
                            {
                                new ConditionExpression
                                {
                                    AttributeName = "systemuserid",
                                    Operator = ConditionOperator.Equal,
                                    Values = {context.InitiatingUserId}                                    
                                }
                            }
                        }
                    }
                }
            };
            var userRoles = organizationService.RetrieveMultiple(jjQuery);
            return userRoles.Entities.ToList().ToList().Find(r => settingRoles.Contains((string)r.Attributes["name"])) != null;
        }