C# 使用LINQ中的用例或if语句？

我有一个LINQ查询（与EF一起使用）

我有以下LINQ查询。请指导我如何在这个查询中使用case或if语句

var selectedResults=
    from InvoiceSet in Invoices
    join BookedAreasSet in BookedAreas 
    on InvoiceSet.InvoiceID equals BookedAreasSet.InvoiceID
    join AreaSet in Areas on BookedAreasSet.AreaID equals AreaSet.AreaID
    select new       
    {
         InvoiceSet.InvoiceNumber,
         InvoiceSet.Amount,
         InvoiceSet.TotalDiscount,
         InvoiceSet.GST,       
         InvoiceSet.PaymentDate,
         InvoiceSet.ShoppingCentreID,
         BookedAreasSet.BookedAreaID,
         AreaSet.Name //Here I want to use Case/ If statment based on some other column
    };

请导游

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谢谢

您可以这样做，但是使用三元运算符

？

var selectedResults=
    from InvoiceSet in Invoices
    join BookedAreasSet in BookedAreas 
    on InvoiceSet.InvoiceID equals BookedAreasSet.InvoiceID
    join AreaSet in Areas on BookedAreasSet.AreaID equals AreaSet.AreaID
    select new     {InvoiceSet.InvoiceNumber,InvoiceSet.Amount,InvoiceSet.TotalDiscount,InvoiceSet.GST,       InvoiceSet.PaymentDate,InvoiceSet.ShoppingCentreID,BookedAreasSet.BookedAreaID,
AreaSet.Name, YourColumn = AreaSet.YourColumnName == yourVariable ? "firstResult" : "other result?"}

您可以通过这种方式组合多个条件

AreaSet.YourColumnName==yourVariable？“第一个结果”： AreaSet.YourColumnName==YourSecond变量？“一些结果”：“一些结果” 其他结果”

---

您可以这样做，但使用三元运算符

？

var selectedResults=
    from InvoiceSet in Invoices
    join BookedAreasSet in BookedAreas 
    on InvoiceSet.InvoiceID equals BookedAreasSet.InvoiceID
    join AreaSet in Areas on BookedAreasSet.AreaID equals AreaSet.AreaID
    select new     {InvoiceSet.InvoiceNumber,InvoiceSet.Amount,InvoiceSet.TotalDiscount,InvoiceSet.GST,       InvoiceSet.PaymentDate,InvoiceSet.ShoppingCentreID,BookedAreasSet.BookedAreaID,
AreaSet.Name, YourColumn = AreaSet.YourColumnName == yourVariable ? "firstResult" : "other result?"}

您可以通过这种方式组合多个条件

AreaSet.YourColumnName==yourVariable？“第一个结果”： AreaSet.YourColumnName==YourSecond变量？“一些结果”：“一些结果” 其他结果”

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您希望IF语句做什么？是否要根据某些条件映射一列或另一列？希望IF语句执行什么操作？是否要根据某些条件映射一列或另一列？