class Program { static void Main(string[] args) { List<EmployeeLocalRegister> lclEmployees = new List<EmployeeLocalRegister>() { new EmployeeLocalRegister(){Name = "A",Phone= "A1"},new EmployeeLocalRegister(){Name = "B",Phone= "B1"},new EmployeeLocalRegister(){Name = "A",Phone= "A2"},Phone= "B2"},Phone= "B3"},new EmployeeLocalRegister(){Name = "C",Phone= "C1"}}; List<EmployeeTelDir> telDir = new List<EmployeeTelDir>(); var queryEmployeeLocalRegisterByName = from empl in lclEmployees group empl by empl.Name; foreach (var employeeGroup in queryEmployeeLocalRegisterByName) { Console.WriteLine(employeeGroup.Key); List<string> phone = new List<string>(); foreach (EmployeeLocalRegister employee in employeeGroup) { Console.WriteLine(" {0}",employee.Phone); phone.Add(employee.Phone); } telDir.Add(new EmployeeTelDir() { Name = employeeGroup.Key,Phone = phone }); } Console.ReadKey(); } } public class EmployeeLocalRegister { public string Name; public string Phone; } public class EmployeeTelDir { public string Name; public List<string> Phone; }
}
我使用上面的代码转换List< EmployeeLocalRegister>列出< EmployeeTelDir>.这是唯一的优化方式吗?
我可以编写更简单的代码来进行List< EmployeeLocalRegister>的来回转换吗?列出< EmployeeTelDir>反之亦然使用Linq查询?
解决方法
如果您不需要Console.WriteLine(…),您的代码可以使用LINQ进行汇总:
List<EmployeeTelDir> telDir = (from empl in lclEmployees group empl by empl.Name into employeeGroup select new EmployeeTelDir { Name = employeeGroup.Key,Phone = (from employee in employeeGroup select employee.Phone).ToList() // The ToList() is the Holy Grail of the LINQ queries }).ToList();
对于倒置操作:
List<EmployeeLocalRegister> inverse = (from employeeTelDir in telDir from phone in employeeTelDir.Phone // Doing 2 from ... in ... successively corresponds to the SelectMany() LINQ method select new EmployeeLocalRegister { Name = employeeTelDir.Name,Phone = phone }).ToList();
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