How to refresh an Entity Framework Core DBContext?

Question

When my table is updated by another party, the db context in dotnet core still return the old value, how can I force the Db context to refresh?

I\'ve done research b

Answer 1

Here is my solution, I hope it will help you.

• The detach function will detach all nested entities and array of entities.
• The findByIdAsync will have an optional parameter to detach the entity and will reload it.

Repository

    public void Detach(TEntity entity)
    {
        foreach (var entry in _ctx.Entry(entity).Navigations)
        {
            if (entry.CurrentValue is IEnumerable children)
            {
                foreach (var child in children)
                {
                    _ctx.Entry(child).State = EntityState.Detached;
                }
            }
            else if (entry.CurrentValue is IEntity child)
            {
                _ctx.Entry(child).State = EntityState.Detached;
            }
        }
        _ctx.Entry(entity).State = EntityState.Detached;
    }

So for exemple with:

Classes:

public interface IEntity
{
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    TPrimaryKey Id { get; set; }
}

public class Sample : IEntity
{
    public Guid Id { get; set; }
    public string Text { get; private set; }   
    public Guid? CreatedByUserId { get; set; }
    public virtual User CreatedByUser { get; set; }     
    public List SampleItems { get; set; } = new List();
}

public class SampleItem : IEntity
{
    public Guid Id { get; set; }
    public string Text { get; private set; }   
    public Guid? CreatedByUserId { get; set; }
    public virtual User CreatedByUser { get; set; }     
}

Manager

    public async Task FindByIdAsync(Guid id, bool includeDeleted = false, bool forceRefresh = false)
    {
        var result = await GetAll()
            .Include(s => s.SampleItems)
            .IgnoreQueryFilters(includeDeleted)
            .FirstOrDefaultAsync(s => s.Id == id);

        if (forceRefresh)
        {
            _sampleRepository.Detach(result);
            return await FindByIdAsync(id, includeDeleted);
        }

        return result;
    }

Controller

    SampleManager.FindByIdAsync(id, forceRefresh: true);