我有一個(gè)帶有方法GetAll的控制器，該方法的所有參數(shù)都是可選的（具有默認(rèn)值）。概念是使以下任何請(qǐng)求均有效：/crm/contacts/crm/contacts?sort=created_by/crm/contacts?search=My%20Customer/crm/contacts?sort=created_by&take=100/crm/contacts?from=10&take=100/crm/contacts?search=My%20Customer&sort=created_by&take=100代碼：[HttpGet][Route("")]public async Task<DTO.CRM.contact[]> GetAllAsync(     int? from = null,     int? take = 10,     string search = null,     string[] sort = null){在調(diào)試中，我懷疑sort為null，相反，我將其視為{string [0]}。我在macOS上使用dotnet core 2.1.4。如果未通過(guò)url傳遞，我如何才能獲得真正為null的排序？