如何從Entity Framework 6中的Auditlog實體獲取id

audit-logging c# entity-framework entity-framework-6 savechanges

我知道那裡有幾個類似的帖子,但我找不到任何解決這個問題的方法。

我想在Entity Framework 6中添加,更改或刪除實體(軟刪除)時添加(某種)AudioLog。我已經重寫了SaveChanges,因為我只想為EntityStates添加,修改或刪除的日誌條目,我在第一次調用SaveChanges之前獲取列表。問題是,因為我需要記錄已執行的操作,我需要檢查實體的EntityState。但是在調用SaveChanges之後,所有條目的EntityState都是Unchanged。

public override int SaveChanges()
{
    using (var scope = new TransactionScope())
    {
        var modifiedEntries = ChangeTracker.Entries()
            .Where(e => e.State == EntityState.Added || e.State == EntityState.Deleted || e.State == EntityState.Modified)
            .ToList();

        int changes = base.SaveChanges();
        foreach (var entry in modifiedEntries)
        {
            ApplyAuditLog(entry);
        }

        base.SaveChanges();
        scope.Complete();
        return changes;
    }
}

private void ApplyAuditLog(DbEntityEntry entry)
{
    ILog entity = entry.Entity as ILog;

    if (entity != null)
    {
        LogOperation operation;
        switch (entry.State)
        {
            case EntityState.Added:
                operation = LogOperation.CreateEntity;
                break;
            case EntityState.Deleted:
                operation = LogOperation.DeleteEntity;
                break;
            case EntityState.Modified:
                operation = LogOperation.UpdateEntity;
                break;
            default:
                throw new ArgumentOutOfRangeException();
        }

        AuditLog log = new AuditLog
        {
            Created = DateTime.Now,
            Entity = entry.Entity.GetType().Name,
            EntityId = entity.Id,
            Operation = operation,
        };

        AuditLog.Add(log);
    }
}

一般承認的答案

啊......當然!!對於新添加的實體,id只是一個“問題”,因此通過將列表拆分為兩個(一個用於修改/刪除,一個用於添加),我分兩個階段創建AuditLog。

對於其他想要應用此類AuditLog的人,這是我的工作代碼:

public override int SaveChanges()
{
    using (var scope = new TransactionScope())
    {
        var addedEntries = ChangeTracker.Entries().Where(e => e.State == EntityState.Added).ToList();
        var modifiedEntries = ChangeTracker.Entries().Where(e => e.State == EntityState.Deleted || e.State == EntityState.Modified).ToList();

        foreach (var entry in modifiedEntries)
        {
            ApplyAuditLog(entry);
        }

        int changes = base.SaveChanges();
        foreach (var entry in addedEntries)
        {
            ApplyAuditLog(entry, LogOperation.CreateEntity);
        }

        base.SaveChanges();
        scope.Complete();
        return changes;
    }
}

private void ApplyAuditLog(DbEntityEntry entry)
{
    LogOperation operation;
    switch (entry.State)
    {
        case EntityState.Added:
            operation = LogOperation.CreateEntity;
            break;
        case EntityState.Deleted:
            operation = LogOperation.DeleteEntity;
            break;
        case EntityState.Modified:
            operation = LogOperation.UpdateEntity;
            break;
        default:
            throw new ArgumentOutOfRangeException();
    }

    ApplyAuditLog(entry, operation);
}

private void ApplyAuditLog(DbEntityEntry entry, LogOperation logOperation)
{
    ILog entity = entry.Entity as ILog;

    if (entity != null)
    {
        AuditLog log = new AuditLog
        {
            Created = DateTime.Now,
            Entity = entry.Entity.GetType().Name,
            EntityId = entity.Id,
            Operation = logOperation,
        };
        AuditLog.Add(log);
    }
}



許可下: CC-BY-SA with attribution
不隸屬於 Stack Overflow
這個KB合法嗎? 是的,了解原因
許可下: CC-BY-SA with attribution
不隸屬於 Stack Overflow
這個KB合法嗎? 是的,了解原因