[英]Linqkit: Prevent circular references and stackoverflow
我正在使用帶有 EntityFrameWorkCore 的 LinqKit 來創建具有單元素投影的投影。 但由於一些模型是嵌套的,我得到了一個stackoverflow。 我試圖向 Projection 方法(bool mapCollusions)添加一個條件來防止這種情況,但它似乎被忽略了。 有誰知道如何防止這些循環引用?
public static Expression<Func<Transport, TransportModel>> GetMainProjection()
{
return transport => new TransportModel()
{
Inmate = transport.Inmate != null ? InmateProjectionsGetProjection(true).Invoke(transport.Inmate) : null,
};
public static Expression<Func<Inmate, InmateModel>> InmateProjectionsGetProjection(bool mapCollusions)
{
return inmate => new InmateModel()
{
Collusions = mapCollusions ? inmate.Collusions.AsQueryable()
.Select(collusion => CollusionProjectionsGetProjection(false).Invoke(collusion))
.ToList() : null
};
}
public static Expression<Func<Collusion, CollusionModel>> CollusionProjectionsGetProjection(bool mapInmate)
{
return collusion => new CollusionModel()
{
Inmate = mapInmate ? InmateProjectionsGetProjection(false).Invoke(collusion.Inmate) : null,
};
}
嘗試以下實現:
public static Expression<Func<Transport, TransportModel>> GetMainProjection()
{
return transport => new TransportModel()
{
Inmate = transport.Inmate != null ? InmateProjectionsGetProjection(true).Invoke(transport.Inmate) : null,
};
}
public static Expression<Func<Inmate, InmateModel>> InmateProjectionsGetProjection(bool mapCollusions)
{
if (!mapCollusions)
return inmate => new InmateModel();
return inmate => new InmateModel()
{
Collusions = nmate.Collusions.AsQueryable()
.Select(collusion => CollusionProjectionsGetProjection(false).Invoke(collusion))
.ToList()
};
}
public static Expression<Func<Collusion, CollusionModel>> CollusionProjectionsGetProjection(bool mapInmate)
{
if (!mapInmate)
return collusion => new CollusionModel();
return collusion => new CollusionModel()
{
Inmate = InmateProjectionsGetProjection(false).Invoke(collusion.Inmate),
};
}
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