Question

可能重复：
Entity Framework DbContext SaveChanges() OriginalValue Incorrect

我发现以下内容对我的需求来说非常简单：http://jmdority.wordpress.com/2011/07/20/using-entity-framework-4-1-dbcontext-change-tracking-for-audit-logging/

我正在使用MVC3和Ninject和EF。我正在我的具体EFDBContext类中实现上述解决方案。修改实体的部分是检查原始值和当前值，以确定应将哪些值写入审计表。问题是我看到原始值作为发布的数据，因此当检查时似乎没有任何变化。

else if (dbEntry.State == System.Data.EntityState.Modified)
        {
            foreach (string propertyName in dbEntry.OriginalValues.PropertyNames)
            {
                string original = dbEntry.OriginalValues.GetValue<object>(propertyName).ToString();
                string current = dbEntry.CurrentValues.GetValue<object>(propertyName).ToString();
                // For updates, we only want to capture the columns that actually changed
                if (!object.Equals(dbEntry.OriginalValues.GetValue<object>(propertyName), dbEntry.CurrentValues.GetValue<object>(propertyName)))
                {
                    result.Add(new TransactionHistory()
                    {
                        //TransactionHistoryID = Guid.NewGuid(),
                        TransactionTypeID = 2,
                        TableName = tableName,
                        FieldName = propertyName,
                        RecordPK = dbEntry.CurrentValues.GetValue<object>(keyName).ToString(),
                        OldValue = dbEntry.OriginalValues.GetValue<object>(propertyName) == null ? null : dbEntry.OriginalValues.GetValue<object>(propertyName).ToString(),
                        NewValue = dbEntry.CurrentValues.GetValue<object>(propertyName) == null ? null : dbEntry.CurrentValues.GetValue<object>(propertyName).ToString(),
                        TransactionBy = userId,
                        TransactionDate = changeTime,
                        TransactionApplication = "Galactus"
                    });
                }
            }
        }

当我单步执行调试器时，我可以看到字符串原始字符串和字符串当前是相同的（两个新数据都已发布）。

我不确定这里没有被正确跟踪。我的存储库以这种方式调用它。

public void Edit(T entity, string userID)
    {
        context.Entry<T>(entity).State = System.Data.EntityState.Modified;            
        context.SaveChanges(userID);
    }

使用saveChanges浏览列表。

public int SaveChanges(string userId)
    {
        // Get all Added/Deleted/Modified entities (not Unmodified or Detached)
        foreach (var ent in this.ChangeTracker.Entries().Where(p => p.State == System.Data.EntityState.Added || p.State == System.Data.EntityState.Deleted || p.State == System.Data.EntityState.Modified))
        {
            // For each changed record, get the audit record entries and add them
            foreach (TransactionHistory x in GetAuditRecordsForChange(ent, userId))
            {
                this.TransactionHistories.Add(x);
            }
        }

        // Call the original SaveChanges(), which will save both the changes made and the audit records
        return base.SaveChanges();
    }

知道为什么我没有在发布的数据之前获得原始值吗？

使用EF OriginalValues进行MVC3审核跟踪

0 个答案: