空字段，但不为空

Question

So I've got the following lines of code:

else
            {
                //if not found, call Gateway Add()
                user.Id = await C3SDbContext.UserGateway.NextIdAsync(context);

                user.CreatedById = modifier.CreatedById;
                user.CreatedBy = modifier.CreatedBy;
                user.DateCreated = DateTime.Now;
                user.UserType = "G";
                System.Diagnostics.Debug.WriteLine(user.UserType);
                user.Status = UserStatus.NEW;
                System.Diagnostics.Debug.WriteLine(user.UserType);

                user.Uic = await C3SDbContext.UicGateway.GetUicByIdAsync(context, user.UicId);
                System.Diagnostics.Debug.WriteLine(user.UserType);
                user.Role = await C3SDbContext.RoleGateway.GetRoleByIdAsync(context, user.RoleId);
                System.Diagnostics.Debug.WriteLine(user.UserType);
                if (ModelState.IsValid)
                {
                    userCheck = await C3SDbContext.UserGateway.AddNewGovernmentUserAsync(context, user, modifier);
                }
                else
                {

                    System.Diagnostics.Debug.WriteLine(user.UserType);
                    ICollection<ModelState> ListValues = ModelState.Values;
                    List<object> Errors = new List<object>();
                    foreach (var item in ModelState.Values)
                    {
                        if (item.Errors.Count() > 0)
                        {
                            Errors.Add(item.Errors);
                        }
                    }
                }
            }

user is an instance of GovernmentUser.cs, which inherits from User.cs. UserType is a string property of User. When I run this, all the instances of "System.Diagnostic.Debug.WriteLine(user.UserType);" return "G" in the Output window. Heowever, the Errors list returns one item, telling me that UserType is null.

My questions are: what is going on here? How can they both come to different results, when executed at the same type, and how can I get it so that ModelState.IsValid == true?

Answer 1

ModelState checks the data that was posted to you in MVC. I don't know if this is in your controller or not, but if it is, then my guess is that the UserType wouldn't be on the original data that was posted. I don't think you can use that check after setting it server-side. It is a check on the data received from the client. If UserType isn't required on the client side, just remove that rule from the Dto. However, if you are uploading the actual Entity directly here and it is using the Required attribute that EF uses, then I would just save it like normal and let EF handle the valdiation instead of using ModelState.