I want to get changes occured in an entity and related datas attached to it.
I know how to get the property names that have changed in one entity:
dbContext.Entry(entity).Properties.Where(x => x.IsModified).Select(x => x.Metadata.Name).ToList();
How to do the same for related data in navigation properties ?
Based on this article (Entity Change Tracking using DbContext in Entity Framework 6), you should override SaveChanges() method to track entity changes and its related entities.
public override int SaveChanges()
{
return base.SaveChanges();
}
Actually, You should change the above code to the following sample:
public override int SaveChanges()
{
var modifiedEntities = ChangeTracker.Entries()
.Where(p => p.State == EntityState.Modified).ToList();
var now = DateTime.UtcNow;
foreach (var change in modifiedEntities)
{
var entityName = change.Entity.GetType().Name;
var primaryKey = GetPrimaryKeyValue(change);
foreach(var prop in change.OriginalValues.PropertyNames)
{
var originalValue = change.OriginalValues[prop].ToString();
var currentValue = change.CurrentValues[prop].ToString();
if (originalValue != currentValue) //Only create a log if the value changes
{
//Create the Change Log
}
}
}
return base.SaveChanges();
}