LINQ系列：LINQ to SQL Transact-SQL函数

1. CASE WHEN ... THEN ...

var expr = from p in context.Products
            select new
            {
                商品ID = p.ProductID,
                商品名称 = p.ProductName,
                是否库存 = p.UnitsInStock > 0 ? "是" : "否"
            };

SELECT
    [Extent1].[ProductID] AS [ProductID],
    [Extent1].[ProductName] AS [ProductName],
    CASE WHEN ([Extent1].[UnitsInStock] > 0) THEN N‘是‘ ELSE N‘否‘ END AS [C1]
    FROM [dbo].[Product] AS [Extent1]