How to automatically populate CreatedDate and ModifiedDate?

Question

I am learning ASP.NET Core MVC and my model is

namespace Joukyuu.Models
{
    public class Passage
    {
        public int PassageId { get; set; }
        publi         


        

Answer 1

If your are using Code first you could try this

[Required, DatabaseGenerated(DatabaseGeneratedOption.Computed)]
public DateTime CreatedDate { get; set; }

On Migration

AddColumn("Passage", "CreatedDate", n => n.DateTime(nullable: false, defaultValueSql: "GETDATE()"));

More reference here,similar answer

Or you can global override the saveChanges Note* This will affect on the entire model if you have the CreatedDate field

public override int SaveChanges()
{
  DateTime saveTime = DateTime.Now;
  foreach (var entry in this.ChangeTracker.Entries()
      .Where(e => e.State == (EntityState) System.Data.EntityState.Added))
   {
     if (entry.Property("CreatedDate").CurrentValue == null)
       entry.Property("CreatedDate").CurrentValue = saveTime;
   }
   return base.SaveChanges();  
}