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• How to get all model validation errors in ASP.NET api

  My model looks like this:

  public class Meeting : IValidatableObject
  {
      public string Id { get; set; }
      [Required]
      public string Start_time { get; set; }
      [Required]
      public string End_time { get; set; }
      [Required]
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      [Required]
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      public string Owner { get; set; }
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      public string Participant { get; set; }
  
      public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
      {
          List<ValidationResult> results = new List<ValidationResult>();
          DateTime dt, dt1;
          if(DateTime.TryParse(Start_time, out dt) == false)
          {
              results.Add(new ValidationResult("Start time wrong", new[] { "Start time" }));
          }
          if (DateTime.TryParse(End_time, out dt1) == false)
          {
              results.Add(new ValidationResult("End time wrong", new[] { "End time" }));
          }
          if (string.Compare(Start_time, End_time) == 1)
          {
              results.Add(new ValidationResult("Time Conflict", new[] { "Time" }));
          }
          return results;
      }
  }
  

  And I don't know how to get all errors in JSON both from model itself and IEnumerable<ValidationResult> Validate method

  My POST method has this realization:

      [HttpPost]
      public IActionResult Create([FromBody] Meeting meet)
      {
          if (ModelState.IsValid)
          {
              Guid obj = Guid.NewGuid();
              meet.Id = obj.ToString();
              _dataAccessProvider.AddMeetingRecord(meet);
              return Ok("Meeting was successfully added");
          }
          return BadRequest(ModelState);
      }
  

  I tried to use IEnumerable allErrors = ModelState.Values.SelectMany(v => v.Errors); and return allErrors in BadRequest but it didn't work
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