public virtual void Delete(TE entity)
{
if (Context.Entry(entity).State == EntityState.Detached)
{
DbSet.Attach(entity);
}
DbSet.Remove(entity);
}
public virtual void Delete(TEntity entityToDelete)
{
if (Context.Entry(entityToDelete).State == EntityState.Detached)
{
Entities.Attach(entityToDelete);
}
Entities.Remove(entityToDelete);
}
public void Remove(TModel entity)
{
if (_dbContext.Entry(entity).State == EntityState.Detached)
{
ModelDbSets.Attach(entity);
}
ModelDbSets.Remove(entity);
}
public TEntity Update(TEntity entity)
{
if (entity == null)
{
return(null);
}
m_context.Set <TEntity>().Attach(entity);
m_context.Entry(entity).State = EntityState.Modified;
m_context.SaveChanges();
return(entity);
}
public static void AddOrUpdate(this Microsoft.EntityFrameworkCore.DbContext ctx, object entity)
{
var entry = ctx.Entry(entity);
switch (entry.State)
{
case EntityState.Detached:
ctx.Add(entity);
break;
case EntityState.Modified:
ctx.Update(entity);
break;
case EntityState.Added:
ctx.Add(entity);
break;
case EntityState.Unchanged:
//item already in db no need to do anything
break;
default:
throw new ArgumentOutOfRangeException();
}
}
public void Update(TEnity item)
{
if (item == null)
{
throw new ArgumentNullException(nameof(item));
}
_context.Entry(item).State = EntityState.Modified;
}
public virtual EntityEntry <TEntity> Entry <TEntity>(TEntity entity) where TEntity : class
{
var internalEntry =
((IDbContextDependencies)_dbContext).StateManager.Entries.FirstOrDefault(ee => ee.Entity == entity);
if (internalEntry != null)
{
return(new EntityEntry <TEntity>(internalEntry));
}
return(_dbContext.Entry(entity));
}
/// <summary>
/// Checks dynamically if the entity exists in the databse. If it does, changes the referenced entity to the database entity, plus with it's values changed using the original entity.
/// If the entity exists, won't change primary keys, navigation properties, properties with private getters and foreign keys ids in wich the given values are equal to 0.
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="context"></param>
/// <param name="expression"></param>
/// <param name="entity"></param>
/// <returns></returns>
private static bool EntityExists <TEntity>(DbContext context, Expression <Func <TEntity, object> > expression, ref TEntity entity)
where TEntity : class
{
var t = typeof(TEntity);
var filterProperties =
expression.Compile()(entity)
.GetType().GetProperties().Select(p => t.GetProperty(p.Name)).ToList();
if (filterProperties == null || filterProperties.Count == 0)
{
throw new Exception($"{t.FullName} does not have a KeyAttribute field. Unable to exec AddOrUpdate call.");
}
int?ct = null;
int GenerateIndex()
{
if (ct == null)
{
ct = 0;
return(ct.Value);
}
else
{
ct++;
}
return(ct.Value);
}
var _entity = entity;
var namesAndValuesToFilter = filterProperties
.Select(x => new
{
Index = GenerateIndex(),
x.Name,
Value = x.GetValue(_entity)
})
.ToList();
var expressions = string.Join(" AND ", namesAndValuesToFilter.OrderBy(x => x.Index).Select(x => $"{x.Name} == @{x.Index}"));
var values = namesAndValuesToFilter.OrderBy(x => x.Index).Select(x => x.Value).ToArray();
var entityType = context.Model.FindEntityType(typeof(TEntity));
var pkKeyName = entityType.FindPrimaryKey().Properties
.Select(x => x.Name).FirstOrDefault() ?? "Id";
var queryResult = context.Set <TEntity>().AsNoTracking()
.Where(expressions, values)
.Select($"new ({pkKeyName})")
.FirstOrDefault();
if (queryResult != null)
{
// Gets the original Entity from the database and change only simple fields.
var pksAndNavigations = entityType
.FindPrimaryKey().Properties.Select(x => x.Name).Distinct().ToList();
var fks = entityType
.GetForeignKeys().SelectMany(x => x.Properties.Select(p => p.Name)).Distinct().ToList();
pksAndNavigations.AddRange(entityType
.GetNavigations().Select(x => x.Name).Distinct().ToList());
var propsToChange = t.GetProperties()
.Where(x => !pksAndNavigations.Contains(x.Name) && x.CanWrite)
.ToList();
var fullEntity = context.Set <TEntity>()
.Where(expressions, values)
.FirstOrDefault();
var dynamicChangeableFields = new ExpandoObject() as IDictionary <string, object>;
foreach (var prop in propsToChange)
{
var value = t.GetProperty(prop.Name).GetValue(entity, null);
// Allow to change only not null or FK values only if they are not 0.
if (value == null || (fks.Contains(prop.Name) && value is int && Convert.ToInt32(value) == 0))
{
continue;
}
dynamicChangeableFields.Add(prop.Name, value);
}
context.Entry(fullEntity).CurrentValues.SetValues(dynamicChangeableFields as ExpandoObject);
context.Entry(fullEntity).State = EntityState.Modified;
entity = fullEntity;
return(true);
}
else
{
return(false);
}
}
public static void ForceUpdate <TEntity>([NotNull] this SystemDbContext thisValue, [NotNull] TEntity entity)
where TEntity : class
{
thisValue.Entry(entity).State = EntityState.Modified;
}
public static void ForceRefresh <TEntity>([NotNull] this SystemDbContext thisValue, [NotNull] TEntity entity)
where TEntity : class
{
thisValue.Entry(entity).State = EntityState.Detached;
}
public static void ReloadNavigationProperty <TEntity, TElement>([NotNull] this SystemDbContext thisValue, [NotNull] TEntity entity, [NotNull] Expression <Func <TEntity, IEnumerable <TElement> > > navigationProperty)
where TEntity : class
where TElement : class
{
thisValue.Entry(entity).Collection(navigationProperty).Query();
}
public static Task ReloadAsync <TEntity>([NotNull] this SystemDbContext thisValue, [NotNull] TEntity entity, CancellationToken cancellationToken)
where TEntity : class
{
return(thisValue.Entry(entity).ReloadAsync(cancellationToken));
}
public static void Reload <TEntity>([NotNull] this SystemDbContext thisValue, [NotNull] TEntity entity)
where TEntity : class
{
thisValue.Entry(entity).Reload();
}
public async Task Can_add_update_delete_end_to_end_using_partial_shadow_state()
{
var model = new Model();
var customerType = model.AddEntityType(typeof(Customer));
var property1 = customerType.AddProperty("Id", typeof(int));
customerType.GetOrSetPrimaryKey(property1);
customerType.AddProperty("Name", typeof(string));
var optionsBuilder = new DbContextOptionsBuilder()
.UseModel(model)
.UseInMemoryDatabase(nameof(ShadowStateUpdateTest))
.UseInternalServiceProvider(_fixture.ServiceProvider);
var customer = new Customer
{
Id = 42
};
using (var context = new DbContext(optionsBuilder.Options))
{
context.Add(customer);
context.Entry(customer).Property("Name").CurrentValue = "Daenerys";
await context.SaveChangesAsync();
context.Entry(customer).Property("Name").CurrentValue = "Changed!";
}
using (var context = new DbContext(optionsBuilder.Options))
{
var customerFromStore = context.Set <Customer>().Single();
Assert.Equal(42, customerFromStore.Id);
Assert.Equal(
"Daenerys",
(string)context.Entry(customerFromStore).Property("Name").CurrentValue);
}
using (var context = new DbContext(optionsBuilder.Options))
{
var customerEntry = context.Entry(customer).GetInfrastructure();
customerEntry[customerType.FindProperty("Name")] = "Daenerys Targaryen";
context.Update(customer);
await context.SaveChangesAsync();
}
using (var context = new DbContext(optionsBuilder.Options))
{
var customerFromStore = context.Set <Customer>().Single();
Assert.Equal(42, customerFromStore.Id);
Assert.Equal(
"Daenerys Targaryen",
(string)context.Entry(customerFromStore).Property("Name").CurrentValue);
}
using (var context = new DbContext(optionsBuilder.Options))
{
context.Remove(customer);
await context.SaveChangesAsync();
}
using (var context = new DbContext(optionsBuilder.Options))
{
Assert.Equal(0, context.Set <Customer>().Count());
}
}
