引發異常：因為兩個對象附​​加到不同的ObjectContext對象，所以無法定義它們之間的關系

Question

我的代碼：

StrategyRepository strategyRepository = new StrategyRepository();
StrategyLookup strategy = strategyRepository.GetStrategy(int.Parse(hidSelectedStrategyID.Value.ToString()));

        //StrategicDirectionRepository strategicDirectionRepository = new StrategicDirectionRepository();
        StrategicDirectionLookup strategicDirection = strategyRepository.GetStrategicDirection(cb_StrategyDirectionsEdit.Value.ToString());
        if (strategicDirection == null) {
            strategicDirection = new StrategicDirectionLookup() { 
                Caption = cb_StrategyDirectionsEdit.Value.ToString(),
                SequenceNo = 100
            };
            //strategyRepository.AddStrategicDirection(strategicDirection);
        }

        //StrategicIntentRepository strategicIntentRepository = new StrategicIntentRepository();
        StrategicIntentLookup strategicIntent = strategyRepository.GetStrategicIntent(cb_StrategyIntentsEdit.Value.ToString());
        if (strategicIntent == null) {
            strategicIntent = new StrategicIntentLookup() {
                Caption = cb_StrategyIntentsEdit.Value.ToString(),
                SequenceNo = 100
            };
            //strategyRepository.AddStrategicIntent(strategicIntent);
        }

        strategy.Caption = txtStrategyEdit.Value.ToString();
        if (!strategicDirection.StrategyLookups.Select(o=>o.SID).Contains(strategy.SID))
        {
            strategicDirection.StrategyLookups.Add(strategy);
        }

        if (!strategicIntent.StrategicDirectionLookups.Select(o=>o.SDID).Contains(strategy.StrategicDirectionLookup.SDID))
        {

            strategicIntent.StrategicDirectionLookups.Add(strategy.StrategicDirectionLookup);
        }
        strategyRepository.SaveChanges();

該行出現異常提示：strategyIntent.StrategicDirectionLookups.Add（strategy.StrategicDirectionLookup）; 如何修復我的代碼以避免此異常？ 非常感謝！

Answer 1

您已經實例化了一個對象上下文以首先加載該對象，然后實例化了另一個對象以進行保存-您不能這樣做，您需要為兩個對象都使用相同的對象上下文。

沒有存儲庫中的代碼，很難看到如何執行此操作，但是上面的注釋應該可以幫助您修復它（可能是一個類級變量來保存上下文，已在類構造函數中實例化）。