model C# 的自定義驗證屬性

Question

我有一個 model

public class SendEmail
{
    public bool IsScheduled { get; set; }
    public DateTime ScheduleDate { get; set; }
    public List<ScheduleAttachement> ScheduleAttachement {get; set;}
}
public class ScheduleAttachement
{
    public string Name { get; set; }
    public string Attachement { get; set; }
}

我想做一個自定義驗證來檢查 bool IsScheduled == true，ScheduleAttachement 必須包含一個值。 如果不拋出 400 錯誤請求

Answer 1

if (SendEmail.IsScheduled) 
{
  //true, in here you can check for a value:
  if(SendEmail.ScheduleAttachement == null || (!SendEmail.ScheduleAttachement.Any()))
  {
     //list is null or empty, throw error
  }
}

less 代碼列表 null 或空檢查：

if (list?.Any() != true)
{
    //list is null or empty, throw error
}

Answer 2

在你的controller層

var emailToCheck = new SendEmail();

if (!emailToCheck.IsScheduled && emailToCheck.ScheduleAttachement.Count() == 0) 
{
    return BadRequest();
}

如果您想添加自定義消息查找此答案。

編輯

if (!emailToCheck.IsScheduled && emailToCheck.ScheduleAttachement?.Where(x => x.Attachment != null && x.Name != null).Count() > 0) 
{
    return BadRequest();
}