Entity framework RIA服务&x2B；实体框架服务器端插入更新删除-日志记录

首先，谢谢你的帮助。我正在使用ria服务插入/更新/删除实体，并保存这些操作的历史记录。我想在对服务的一次调用中执行该操作并保存历史记录。现在我被插入卡住了，因为我需要插入时生成的新实体ID。我可能采取了错误的方法（但我希望不会）。我已重写submit方法，正在尝试在历史记录表中保存快照，我不想保存原始版本的快照：

    public override bool Submit( ChangeSet changeSet )
    {
        //SUBMIT FIRST SO THE OBJECT(S) HAVE AN ID
        var success = base.Submit( changeSet );
        if ( success )
            foreach ( var changeSetEntry in changeSet.ChangeSetEntries )
            {
                if ( changeSetEntry.Entity is MyBusinessEntity )
                {
                    var newBusinessEntity = (MyBusinessEntity) changeSetEntry.Entity;
                    RecordModifiedMyBusinessEntity( changeSetEntry.Operation, newBusinessEntity );
                }
            }
        return success;
    }

    private void RecordModifiedMyBusinessEntity( DomainOperation operation, MyBusinessEntity newBusinessEntity )
    {
        var hist = new BusinessEntityHistory
        {
            ChangedBy = new AuthenticationService().GetUser().FriendlyName,
            ChangedDate = DateTime.Now,
            Operation = operation.ToString(),
            BusinessEntityId = newBusinessEntity.Id,
            Group = newBusinessEntity.Group,
            Priority = newBusinessEntity.Priority,
            ....
        };
        InsertBusinessEntityHistory( hist );
        //HERE IS WHERE I WANT TO CALL SUBMIT CHANGES AGAIN, BUT 1 - IT'S NOT IN THE CHANGESET,
        //AND 2 - THE OBJECT I ALREADY INSERTED IS IN THE CHANGESET (SO IF I SUBMIT AGAIN, IT GETS 
        //INSERTED TWICE AND NO HISTORY IS SAVED.  AND 3 - I CAN'T DO THE HISTORY BEFORE BECAUSE I DON'T 
        //HAVE THE ID, AND I DON'T WANT TO DO A MAX ID + 1 BECAUSE SOMEONE ELSE MIGHT BE 
        //INSERTING INTO THE SAME TABLE
    }

---

以下是我最终采用的解决方案：

    public override bool Submit( ChangeSet changeSet )
    {
        //submit the changes
        var success = base.Submit( changeSet );
        if ( success )
        {
            //make a new list of change set entries 
            var entries = new List<ChangeSetEntry>();
            //each change set entry needs an id (not to be confused with the entity's id)
            var maxId = 0;
            //iterate through each change and add historical snapshot.
            foreach ( var changeSetEntry in changeSet.ChangeSetEntries )
            {
                var entity = changeSetEntry.Entity;
                var operation = changeSetEntry.Operation;
                var myEntity = entity as MyEntityType;
                if ( myEntity != null )
                {
                    entries.Add( GetHistoryChangeSetEntry( ref maxId, operation, myEntity ) );
                    continue;
                }
            }
            //make new change set with historical snapshots
            var newChangeSet = new ChangeSet( entries );
            //submit the new change set
            base.Submit( newChangeSet );
        }
        return success;
    }

    private ChangeSetEntry GetHistoryChangeSetEntry( ref int maxId, DomainOperation operation, MyEntityType myEntity )
    {
        return new ChangeSetEntry
                {
                    Id = ++maxId,
                    //We are inserting this change set entry
                    Operation = DomainOperation.Insert,
                    Entity = new MyEntityTypesHistory
                                {
                                    ChangedBy = ServiceContext.User.Identity.Name,
                                    ChangedDate = DateTime.Now,
                                    //The operation performed on the original entity
                                    Operation = operation.ToString(),
                                    MyEntityId = myEntity.EntityId,
                                    MyEntityField1 = myEntity.EntityField1,
                                    MyEntityField2 = myEntity.EntityField2
                                }
                };
    }

public override bool Submit（变更集变更集）
{
//提交更改
var success=base.Submit（变更集）；
如果（成功）
{
//创建更改集条目的新列表
var entries=新列表（）；
//每个变更集条目都需要一个id（不要与实体的id混淆）
var-maxId=0；
//迭代每个更改并添加历史快照。
foreach（changeSet.ChangeSetEntries中的var changeSetEntry）
{
var entity=changeSetEntry.entity；
var operation=changeSetEntry.operation；
var myEntity=作为MyEntityType的实体；
如果（myEntity！=null）
{
Add（GetHistoryChangeSetEntry（ref-maxId，operation，myEntity））；
继续；
}
}
//使用历史快照创建新更改集
var newChangeSet=新变更集（条目）；
//提交新的更改集
提交（新变更集）；
}
回归成功；
}
私有ChangeSetEntry GetHistoryChangeSetEntry（ref int maxId，DomainOperation操作，MyEntityType myEntity）
{
返回新的ChangeSetEntry
{
Id=++maxId，
//我们正在插入此变更集条目
Operation=DomainOperation.Insert，
实体=新的MyEntityTypesStory
{
ChangedBy=ServiceContext.User.Identity.Name，
ChangedDate=DateTime。现在，
//对原始实体执行的操作
Operation=Operation.ToString（），
MyEntityId=myEntity.EntityId，
MyEntityField1=myEntity.EntityField1，
MyEntityField2=myEntity.EntityField2
}
};
}

我必须创建一个新的变更集，为其创建新的变更集条目，并使用新的变更集提交变更