static void Main(string[] args)
{
DatamipEntities entity = new DatamipEntities();
//entity.Product.Add(new Product() { ProductID=9, ProductName="商品9" });
//entity.SaveChanges();
var query = from p in entity.Product
join o in entity.Order
on p.ProductID equals o.ProductID
select new { ProductID = p.ProductID, OrderTitle = o.OrderTitle };
var list = query.ToList();
}
static void Main(string[] args)
{
// This expression adds the values of its two arguments.
// Both arguments must be of the same type.
Expression sumExpr = Expression.Add(
Expression.Constant(1),
Expression.Constant(2)
);
// Print out the expression.
Console.WriteLine(sumExpr.ToString());
var func = Expression.Lambda <Func <int> >(sumExpr).Compile();
var i = func();
//Console.WriteLine(Expression.Lambda<Func<int>>(sumExpr).Compile()());
// select * from xxxTable where i ==2
////我们就看到了，Expression 将 func装到了自己的口袋里
//Expression<Func<int, bool>> exp = i => i == 2;
////将func函数从Expression中取出来。
//var func = exp.Compile();
//var b = func(10);
DatamipEntities entity = new DatamipEntities();
entity.Product.Add(new Product()
{
ProductID = 9, ProductName = "商品9"
});
////entity.SaveChanges();
//var query = from p in entity.Product
// join o in entity.Order
// on p.ProductID equals o.ProductID
// select new { ProductID=p.ProductID, OrderTitle=o.OrderTitle };
//var list = query.ToList();
}
