How to track Entity column changes and save the history in new table

[rajasingh012]

I have Post class, whenever the text changed it should be recorded in PostHistory class

class Post { Guid id, string text }

In CMSDbcontext class, which extended AbpDbContext class, wrote the following code

public override async Task<int> SaveChangesAsync(bool acceptAllChangesOnSuccess, CancellationToken cancellationToken = default)
    {
        var modifiedEntities = ChangeTracker.Entries<Post>()
            .Where(p => p.State == EntityState.Modified)
            .ToList();
        List<PostHistory> PostHistories = new List<PostHistory>();
        foreach (var entity in modifiedEntities)
        {
            var originalValues = entity.OriginalValues.ToObject();
            var currentValues = entity.CurrentValues.ToObject();

            foreach (var property in entity.Properties)
            {
                var originalValue = property.OriginalValue;
                var currentValue = property.CurrentValue;

                if (originalValue != null && !originalValue.Equals(currentValue))
                {

But the originalValues and currentValues are same. So can't create posthistory. What is the best way to track this scenario

[rajasingh012]

I have a automapper mapping with original class to DTO and again DTO to original class. I think because of that which column modified information is lost. Looking on it. Will update here