public static int SubmitSaveChanges(this DbContext dbContext,
bool acceptAllChangesOnSuccess = true)
{
dbContext.NotNull(nameof(dbContext));
CheckDisposed(dbContext);
var dependencies = dbContext.GetService <IDbContextDependencies>();
dependencies.UpdateLogger.SaveChangesStarting(dbContext);
TryDetectChanges(dbContext);
try
{
var entitiesSaved = dependencies.StateManager.SaveChanges(acceptAllChangesOnSuccess);
dependencies.UpdateLogger.SaveChangesCompleted(dbContext, entitiesSaved);
return(entitiesSaved);
}
catch (DbUpdateConcurrencyException exception)
{
dependencies.UpdateLogger.OptimisticConcurrencyException(dbContext, exception);
throw;
}
catch (Exception exception)
{
dependencies.UpdateLogger.SaveChangesFailed(dbContext, exception);
throw;
}
}
public static void ConcurrentUpdates <TEntity>(this DbContext dbContext,
DbUpdateConcurrencyException exception, Func <TEntity, bool> predicate, string updatePropertyName = null)
where TEntity : class
{
dbContext.NotNull(nameof(dbContext));
exception.NotNull(nameof(exception));
foreach (var entry in exception.Entries)
{
if (entry.Entity is TEntity)
{
foreach (var property in entry.Metadata.GetProperties())
{
var dbEntity = dbContext.Set <TEntity>().AsNoTracking().Single(predicate);
var dbEntityEntry = dbContext.Entry(dbEntity);
//var proposedValue = entry.Property(property.Name).CurrentValue;
//var originalValue = entry.Property(property.Name).OriginalValue;
//var databaseValue = dbEntityEntry.Property(property.Name).CurrentValue;
// 如果要更新的属性名不为空且等于当前属性，或要更新的属性名为空，则并发更新此属性
if ((updatePropertyName.IsNotEmpty() && property.Name == updatePropertyName) ||
updatePropertyName.IsEmpty())
{
// Update original values to
entry.Property(property.Name).OriginalValue = dbEntityEntry.Property(property.Name).CurrentValue;
if (updatePropertyName.IsNotEmpty())
{
break; // 如果只更新当前属性，则跳出属性遍历
}
}
}
}
else
{
throw new NotSupportedException("Don't know how to handle concurrency conflicts for " + entry.Metadata.Name);
}
}
dbContext.SaveChanges();
}
public static async Task <int> SubmitSaveChangesAsync(this DbContext dbContext,
bool acceptAllChangesOnSuccess = true, CancellationToken cancellationToken = default)
{
dbContext.NotNull(nameof(dbContext));
CheckDisposed(dbContext);
var dependencies = dbContext.GetService <IDbContextDependencies>();
dependencies.UpdateLogger.SaveChangesStarting(dbContext);
TryDetectChanges(dbContext);
try
{
var entitiesSaved = await dependencies.StateManager
.SaveChangesAsync(acceptAllChangesOnSuccess, cancellationToken)
.ConfigureAwait();
dependencies.UpdateLogger.SaveChangesCompleted(dbContext, entitiesSaved);
return(entitiesSaved);
}
catch (DbUpdateConcurrencyException exception)
{
dependencies.UpdateLogger.OptimisticConcurrencyException(dbContext, exception);
throw;
}
catch (Exception exception)
{
dependencies.UpdateLogger.SaveChangesFailed(dbContext, exception);
throw;
}
}