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c# - 更新 IEnumerable 中的项目属性但该属性未保持设置?

我有两个表:Transactions和TransactionAgents。TransactionAgents有一个名为TransactionID的Transactions外键。相当标准。我也有这个代码:BrokerManagerDataContextdb=newBrokerManagerDataContext();vartransactions=fromtindb.Transactionswheret.SellingPrice!=0selectt;vartaAgents=fromtaindb.TransactionAgentsselectta;foreach(vartransactio

c# - 更新 IEnumerable 中的项目属性但该属性未保持设置?

我有两个表:Transactions和TransactionAgents。TransactionAgents有一个名为TransactionID的Transactions外键。相当标准。我也有这个代码:BrokerManagerDataContextdb=newBrokerManagerDataContext();vartransactions=fromtindb.Transactionswheret.SellingPrice!=0selectt;vartaAgents=fromtaindb.TransactionAgentsselectta;foreach(vartransactio