使用数据库：NorthWind示例数据库 （链接：https://www.cnblogs.com/liverpool/p/4718042.html）
后台代码：
namespace T1_EF.Controllers
{
public class CustomersController : Controller
{
// GET: Customers
public ActionResult Index()
{
//NorthwindEntities northwind = new NorthwindEntities();
//var list = northwind.Customers.Select(c =>c);
//建议使用下面这种写法，面向抽象编程，使用多态，并且更灵活
//DbContext dbContext = new NorthwindEntities();
//var list = dbContext.Set<Customers>().Select(c => c);
//使用Linq练习操作
dynamic list;
DbContext db = new NorthwindEntities();
//基本查询
//list = from customer in db.Set<Customers>() select customer;
//单条件查询
//list = from customer in db.Set<Customers>() where customer.Country == "USA" select customer;
//多条件查询
//list = from customer in db.Set<Customers>()
// where customer.Country == "USA" || customer.Country == "Canada"
// select customer;
//查询单列（这样就不能使用强类型视图了）
//list = from customer in db.Set<Customers>() select customer.Country;
//查询多列（将select后换为匿名对象或者要展示的对象）（建议新增viewModel作为视图对象，否则在前台数据必须进行反序列化操作）
//list = from customer in db.Set<Customers>() select new CustomerModel{ ContactName= customer.ContactName,CompanyName= customer.CompanyName };
//分页,Skip就是跳过元素，Take就是要返回排在前面的几个元素，一般与OrderBy排序使用（注意：是方法特有的，不是Linq写法）
list = (from customer in db.Set<Customers>() select
customer).OrderBy(c => c.CompanyName).Skip(5).Take(15);
ViewData.Model = list;
return View();
}
public ActionResult FuncTionIndex()
{
//使用方法进行查询
DbContext db = new NorthwindEntities();
//返回全部数据
var list = db.Set<Customers>();
//单条件查询(像JQuery的树一样叠加)
//var list1 = list.Where(c => c.Country == "USA");
//多条件
//var list1 = list.Where(c => c.Country == "USA" || c.Country == "Canada");
//单列或者多列查询
//var list1 = list.Select(c =>
//new CustomerModel { CompanyName = c.CompanyName, ContactName = c.ContactName });
ViewData.Model = list1;
return View();
}
}
}
前台代码：
@model IEnumerable<T1_EF.Models.Customers>
@*@model IEnumerable<T1_EF.ViewModels.CustomerModel>*@
@{
Layout = null;
}
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>FuncTionIndex</title>
</head>
<body>
<div>
<table border="1">
<tr>
<td>联系人姓名</td>
<td>客户公司</td>
<td>客户属国</td>
</tr>
@foreach (var item in Model)
{
<tr>
<td>@item.ContactName</td>
<td>@item.CompanyName</td>
<td>@item.Country</td>
</tr>
}
</table>
</div>
</body>
</html>
显示效果：
End
原文地址：https://www.cnblogs.com/LeeSki/p/12261837.html
时间： 2024-11-12 03:30:42