[英]Using Database first approach in Entity framework, how to fetch the data from a single table only which has multiple foreign key relationship?
[英]How to update a table which has a foreign key reference using Entity Framework?
我有以下方法:
public static Int32 SaveAgent(IAgent i)
{
dc = new mcollectorDataContext(ConnectionString.GetConStr());
//check if the record exists
t_agent matchID = dc.t_agents.Where(x => x.id == i.AgentID).FirstOrDefault();
try
{
if (matchID == null)
{
// if not exists add new row
t_agent _agent = new t_agent
{
wallet = i.Wallet,
branchid = GetBranchID(i.Branch),
lastupdated = i.LastUpdated,
};
dc.t_agents.InsertOnSubmit(_agent);
dc.SubmitChanges();
return _agent.id;
}
else
{
// else update row
matchID.wallet = i.Wallet;
matchID.branchid = GetBranchID(i.Branch);
matchID.lastupdated = i.LastUpdated;
dc.SubmitChanges();
return i.AgentID;
}
}
catch (Exception)
{
throw ;
}
}
此方法可以保存新的ordord,但是當我嘗試更新時,它失敗了,無法更新任何記錄,但是它也不會引發錯誤。 如何解決該問題?
也許嘗試告訴實體框架該模型已被修改?
在致電submitchanges之前嘗試添加它
dc.Entry(matchID).State = EntityState.Modified;
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