/// <summary>
/// Creates a scope in which a DbContext instance behaves differently.
/// The behaviour is resetted on disposal of the scope to what it was before.
/// </summary>
/// <param name="ctx">The context instance to change behavior for.</param>
/// <param name="deferCommit">
/// Suppresses the execution of <see cref="DbContext.SaveChanges()"/> / <see cref="DbContext.SaveChangesAsync(CancellationToken)"/>
/// until this instance is disposed or <see cref="Commit()"/> / <see cref="CommitAsync(CancellationToken)"/> is called explicitly.
/// </param>
/// <param name="retainConnection">
/// Opens connection and retains it until disposal. May increase load/save performance in large scopes.
/// </param>
public DbContextScope(HookingDbContext ctx,
bool?autoDetectChanges = null,
bool?lazyLoading = null,
bool?forceNoTracking = null,
bool?deferCommit = false,
bool retainConnection = false,
HookImportance?minHookImportance = null,
CascadeTiming?cascadeDeleteTiming = null,
CascadeTiming?deleteOrphansTiming = null,
bool?autoTransactions = null)
{
Guard.NotNull(ctx, nameof(ctx));
var changeTracker = ctx.ChangeTracker;
_ctx = ctx;
_autoDetectChangesEnabled = changeTracker.AutoDetectChangesEnabled;
_minHookImportance = ctx.MinHookImportance;
_suppressCommit = ctx.SuppressCommit;
_lazyLoadingEnabled = changeTracker.LazyLoadingEnabled;
_queryTrackingBehavior = changeTracker.QueryTrackingBehavior;
_cascadeDeleteTiming = changeTracker.CascadeDeleteTiming;
_deleteOrphansTiming = changeTracker.DeleteOrphansTiming;
_autoTransactionEnabled = ctx.Database.AutoTransactionsEnabled;
_retainConnection = retainConnection;
if (autoDetectChanges.HasValue)
{
changeTracker.AutoDetectChangesEnabled = autoDetectChanges.Value;
}
if (minHookImportance.HasValue)
{
ctx.MinHookImportance = minHookImportance.Value;
}
if (lazyLoading.HasValue)
{
changeTracker.LazyLoadingEnabled = lazyLoading.Value;
}
if (forceNoTracking == true)
{
changeTracker.QueryTrackingBehavior = QueryTrackingBehavior.NoTracking;
}
if (deferCommit.HasValue)
{
ctx.SuppressCommit = deferCommit.Value;
}
if (cascadeDeleteTiming.HasValue)
{
changeTracker.CascadeDeleteTiming = cascadeDeleteTiming.Value;
}
if (deleteOrphansTiming.HasValue)
{
changeTracker.DeleteOrphansTiming = deleteOrphansTiming.Value;
}
if (autoTransactions.HasValue)
{
ctx.Database.AutoTransactionsEnabled = autoTransactions.Value;
}
if (retainConnection)
{
ctx.Database.OpenConnection();
}
}