1. Any
返回没有Product的Category
var expr = from c in context.Categorieswhere !c.Products.Any()select c;
SELECT [Extent1].[CategoryID] AS [CategoryID], [Extent1].[CategoryName] AS [CategoryName]FROM [dbo].[Category] AS [Extent1]WHERE NOT EXISTS (SELECT 1 AS [C1]FROM [dbo].[Product] AS [Extent2]WHERE [Extent1].[CategoryID] = [Extent2].[CategoryID])
var expr = from c in context.Categorieswhere !c.Products.Any(p => p.UnitPrice > 10m)select c;
SELECT [Extent1].[CategoryID] AS [CategoryID], [Extent1].[CategoryName] AS [CategoryName]FROM [dbo].[Category] AS [Extent1]WHERE NOT EXISTS (SELECT 1 AS [C1]FROM [dbo].[Product] AS [Extent2]WHERE ([Extent1].[CategoryID] = [Extent2].[CategoryID]) AND ([Extent2].[UnitPrice] > cast(10 as decimal(18))))
2. All
var expr = from c in context.Categorieswhere c.Products.All(p => p.Discontinued)select c;
SELECT [Extent1].[CategoryID] AS [CategoryID], [Extent1].[CategoryName] AS [CategoryName]FROM [dbo].[Category] AS [Extent1]WHERE NOT EXISTS (SELECT 1 AS [C1]FROM [dbo].[Product] AS [Extent2]WHERE ([Extent1].[CategoryID] = [Extent2].[CategoryID]) AND ([Extent2].[Discontinued] <> cast(1 as bit)))
3. Contains
var expr = from p in context.Productswhere new string[] { "LINQ to Object","LINQ to ", "LINQ to XML" }.Contains(p.ProductName)select p;
SELECT [Extent1].[ProductID] AS [ProductID], [Extent1].[CategoryID] AS [CategoryID], [Extent1].[ProductName] AS [ProductName], [Extent1].[UnitPrice] AS [UnitPrice], [Extent1].[UnitsInStock] AS [UnitsInStock], [Extent1].[Discontinued] AS [Discontinued]FROM [dbo].[Product] AS [Extent1]WHERE [Extent1].[ProductName] IN (N'LINQ to Object', N'LINQ to ', N'LINQ to XML')
var expr = from p in context.Productswhere !(new string[] { "LINQ to Object","LINQ to ", "LINQ to XML" }).Contains(p.ProductName)select p;
SELECT [Extent1].[ProductID] AS [ProductID], [Extent1].[CategoryID] AS [CategoryID], [Extent1].[ProductName] AS [ProductName], [Extent1].[UnitPrice] AS [UnitPrice], [Extent1].[UnitsInStock] AS [UnitsInStock], [Extent1].[Discontinued] AS [Discontinued]FROM [dbo].[Product] AS [Extent1]WHERE NOT ([Extent1].[ProductName] IN (N'LINQ to Object', N'LINQ to ', N'LINQ to XML'))
