LINQ系列：LINQ to SQL Join连接

1. 一对多

var expr = context.Products
    .Where(p => p.Category.CategoryName == "LINQ to SQL" && p.UnitPrice > 10m)
    .Select(p => new
    {
        p.ProductID,
        p.ProductName
    });

var expr = from p in context.Products
            where p.Category.CategoryName == "LINQ to SQL" && p.UnitPrice > 10m
            select new
            {
                p.ProductID,
                p.ProductName
            };

SELECT 
    [Extent1].[ProductID] AS [ProductID], 
    [Extent1].[ProductName] AS [ProductName]
    FROM  [dbo].[Product] AS [Extent1]
    INNER JOIN [dbo].[Category] AS [Extent2] ON [Extent1].[CategoryID] = [Extent2].[CategoryID]
    WHERE (N‘LINQ to SQL‘ = [Extent2].[CategoryName]) AND ([Extent1].[UnitPrice] > cast(10 as decimal(18)))