private static void Write(this IEntityEntryWriter writer, IEnumerable <EntityEntry> entries, SerializationMode mode)
{
foreach (var entityEntry in entries.OrderedByMetadata( ))
{
writer.Write(entityEntry, mode);
}
}
public static async Task <int> SaveChangesAsync(this DbContext context, IEntityEntryWriter writer, CancellationToken cancellationToken = default)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (writer == null)
{
throw new ArgumentNullException(nameof(writer));
}
var snapshots = context.ChangeTracker.Entries( ).GetSnapshots( );
var rowCount = await context.SaveChangesAsync(cancellationToken)
.ConfigureAwait(false);
foreach (var snapshot in snapshots)
{
writer.Write(snapshot.EntityEntry,
snapshot.EntityState == EntityState.Added ? SerializationMode.ValuesGeneratedOnAdd :
SerializationMode.ValuesGeneratedOnUpdate,
snapshot.Properties);
}
return(rowCount);
}
public static void SerializeGraphChanges(this DbContext context, IEntityEntryWriter writer, params object [] items)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (writer == null)
{
throw new ArgumentNullException(nameof(writer));
}
writer.Write(context.Graph(items).Where(IsChanged), SerializationMode.Changes);
}
public static void SerializeChanges(this DbContext context, IEntityEntryWriter writer)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (writer == null)
{
throw new ArgumentNullException(nameof(writer));
}
writer.Write(context.ChangeTracker.Entries( ).Where(IsChanged), SerializationMode.Changes);
}
public static void SerializeGraph(this DbContext context, IEntityEntryWriter writer, object item)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (writer == null)
{
throw new ArgumentNullException(nameof(writer));
}
writer.Write(context.Graph(item), SerializationMode.Full);
}
public static int SaveChanges(this DbContext context, IEntityEntryWriter writer)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (writer == null)
{
throw new ArgumentNullException(nameof(writer));
}
var snapshots = context.ChangeTracker.Entries( ).GetSnapshots( );
var rowCount = context.SaveChanges( );
foreach (var snapshot in snapshots)
{
writer.Write(snapshot.EntityEntry,
snapshot.EntityState == EntityState.Added ? SerializationMode.ValuesGeneratedOnAdd :
SerializationMode.ValuesGeneratedOnUpdate,
snapshot.Properties);
}
return(rowCount);
}
private static void Write(this IEntityEntryWriter writer, EntityEntry entityEntry, SerializationMode mode, IDictionary <IProperty, object?>?originalValues = null)
{
var state = entityEntry.State;
writer.WriteStartEntry( );
writer.WriteEntityType(entityEntry.Metadata);
writer.WriteEntityState(state);
var properties = entityEntry.Properties.ToList( );
var writeAllProperties = mode == SerializationMode.Full && state != EntityState.Deleted || state == EntityState.Added;
if (originalValues != null)
{
foreach (var property in properties)
{
if (writeAllProperties || property.Metadata.IsPrimaryKey( ) || property.Metadata.IsConcurrencyToken)
{
if (originalValues.TryGetValue(property.Metadata, out var originalValue))
{
writer.WriteProperty(property.Metadata, originalValue);
}
else
{
writer.WriteProperty(property.Metadata, property.OriginalValue);
}
}
}
}
else
{
foreach (var property in properties)
{
if (writeAllProperties || property.Metadata.IsPrimaryKey( ) || property.Metadata.IsConcurrencyToken)
{
writer.WriteProperty(property.Metadata, property.OriginalValue);
}
}
}
var modifiedProperties = mode switch
{
SerializationMode.ValuesGeneratedOnAdd => properties.Where(HasValueGeneratedOnAdd),
SerializationMode.ValuesGeneratedOnUpdate => properties.Where(HasValueGeneratedOnUpdate),
_ => properties.Where(property => property.IsModified)
};
foreach (var modifiedProperty in modifiedProperties)
{
writer.WriteModifiedProperty(modifiedProperty.Metadata, modifiedProperty.CurrentValue);
}
if (mode == SerializationMode.Full)
{
foreach (var collection in entityEntry.Collections)
{
if (collection.IsLoaded)
{
writer.WriteNavigationState(collection.Metadata);
}
}
}
writer.WriteEndEntry( );
}
