在 EF Core 5.0 中使用表值 function

Question

我正在將 Asp.Net MVC 項目從.Net 2.2 遷移到.Net 5.0。

最后一個絆腳石是讓表值 function 與 EF Core 5 一起使用。

在 EF Core 2.2 中，語法為：

public IQueryable<OutOfService> UnitOutOfService(DateTime startingDate, DateTime endingDate) =>
Query<OutOfService>().FromSql($"SELECT * FROM UnitOutofServiceView(NULL, 1, '1,2,3,4,6', 0, {startingDate}, {endingDate}, 0, 0, 0)");

我只對提供startingDate和endingDate參數感興趣。

我能夠通過 controller 中的表加入 TVF：

model = await (
    from v in context.Vehicles
        join r in context.UnitOutOfService(DateTime.Now.Date, DateTime.Now.Date) on v.ID equals r.ID into loj
        from rs in loj.DefaultIfEmpty()
    where v.Schedule == true && v.Suspend == false
    orderby v.Name
    select new IndexViewModel
    {
        ID = v.ID,
        Name = v.Name,
        ...
        ServiceDescription = rs.Description
    }
).ToListAsync();

不幸的是，我無法讓它在 EF Core 5.0 中工作。

我在ApplicationDbContext class 中定義了 TVF：

public IQueryable<OutOfService> UnitOutOfService(string sns, int expectedversion, string Site, bool UnitHistory, DateTime HistoryStartDate, DateTime HistoryDateEnd, int DaysOutMin, bool InServiceUnits, bool NotSowFromRO)
            => FromExpression(() => UnitOutOfService(null, 1, "1,2,3,4,6", false, HistoryStartDate, HistoryDateEnd, 0, false, false));

“默認”，參數值在 controller 中似乎沒有任何影響，所以我再次提供它們：

return await (
    from v in _context.Vehicles
    join r in _context.UnitOutOfService(DateTime.Now.Date, DateTime.Now.Date) on v.VehicleID equals r.UnitNumber into loj
    join r in _context.UnitOutOfService(null, 1, "1,2,3,4,6", false, today, today, 0, false, false) on v.VehicleID equals r.UnitNumber into loj
    from rs in loj.DefaultIfEmpty()
    orderby v.Name
    select new IndexViewModel
    {
        ID = v.ID,
        Name = v.Name,
        ...
        ServiceDescription = rs.Description
    }
).ToArrayAsync();

運行控制器的代碼會產生許多錯誤。

我錯過了什么？

Answer 1

這段代碼是真的：

public IQueryable<OutOfService> UnitOutOfService(string sns, int expectedversion, string Site, bool UnitHistory, DateTime HistoryStartDate, DateTime HistoryDateEnd, int DaysOutMin, bool InServiceUnits, bool NotSowFromRO)
        => FromExpression(() => UnitOutOfService(sns, expectedversion, Site, UnitHistory, HistoryStartDate, HistoryDateEnd, DaysOutMin, InServiceUnits, NotSowFromRO);