关于select、where 基础
刚开始看linq


问题：下面2句，分别用where，select ，有什么区别，查询结果是不是都一样
orders是List<Order>
var ordByCountry = orders.Where(order => order.ShipCountry.Equals(country));

var ordByCountry = orders.Select(order => order.ShipCountry.Equals(country));


public class Order
{
private int orderID;
private string customerID;
private decimal freight;
private string shipName;
private string shipAddress;
private string shipCity;
private string shipCountry;

public int OrderID { get; set; }
public string CustomerID { get; set; }
public decimal Freight { get; set; }
public string ShipName { get; set; }
public string ShipAddress { get; set; }
public string ShipCity { get; set; }
public string ShipCountry { get; set; }
}


[解决办法]
修改一下

var v = list.Select(x => x = 5);返回 5,5,5,5,5,5,5,5,5,5 10个5
[解决办法]
where和select怎么会一样呢

你自己构造点数据，执行下边两个语句就明白了：


var ordByCountry = orders.Where(order => order.ShipCountry.Equals(country));

var ordByCountry1 = orders.Select(order => order.ShipCountry);

[解决办法]
修改下
比如说

C# code

int[] data = { 1, 2, 3, 4, 5, 6 };