EntityFramework常用查询语句

方法一：Linq to Entitie

var info = from p in entity.Users where p.ID >= 10 orderby p.ID descending select p;
foreach (var item in info)
{
    Console.WriteLine("ID:" + item.ID + " " + "登录名:" + item.LoginName + " " + "密码:" + item.Password);
}

方法二：Lamada表达式

var info2 = entity.Users.Where<User>(p => p.ID >= 10).OrderByDescending(p => p.ID);
foreach (var item in info)
{
    Console.WriteLine("ID:" + item.ID + " " + "登录名:" + item.LoginName + " " + "密码:" + item.Password);
}

方法三：Entity SQL Language

var info3 = ((IObjectContextAdapter)entity).ObjectContext.CreateQuery<User>(strSQL);
foreach (var item in info)
{
    Console.WriteLine("ID:" + item.ID + " " + "登录名:" + item.LoginName + " " + "密码:" + item.Password);
}

方法四：SqlQuery

try
{
    string strSQL2 = "SELECT * FROM Users WHERE ID>=10 ORDER BY ID DESC";
    var info4 = entity.Database.SqlQuery<User>(strSQL2);
    foreach (var item in info)
    {
        Console.WriteLine("ID:" + item.ID + " " + "登录名:" + item.LoginName + " " + "密码:" + item.Password);
    }
}
catch (Exception ex)
{
    Console.WriteLine(ex.Message);
}

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