利用Lambda获取属性名称

时间:2024-07-28 09:07:38

感谢下面这篇博文给我的思路:

http://www.cnblogs.com/daimage/archive/2012/04/10/2440186.html

上面文章的博主给出的代码是可用的,但是调用方法时需要写的代码过于冗长,例如博主给出的示例代码

var name = TypeInfoHelper.GetClassPropertiesName<MyClass,List<string>>(s => myClass.UserName);

代码中的List<string>为MyClass.UserName属性的类型,如果要获取一个类型为int的Flag属性还得相应的改为下面这个样子

var name = TypeInfoHelper.GetClassPropertiesName<MyClass,int>(s => customer.Flag);

我想把其中的传入泛型参数的代码拿掉,变成这样子:

TypeInfoHelper.GetPropertyName(s=>myClass.UserName)

是不是变得非常简洁?下面即是全部代码,再次感谢代码哥,致敬!

using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text; namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
var cust = new Customer();
var addr = new Address(cust);
string name1 = TypeInfoHelper.GetPropertyName(p => cust.Flag);
Console.WriteLine(name1);
string name2 = TypeInfoHelper.GetPropertyName(p => addr.Owner.Remark);
Console.WriteLine(name2);
string name3 = TypeInfoHelper.GetPropertyName(p => cust.Orders);
Console.WriteLine(name3);
string name4 = TypeInfoHelper.GetPropertyName(p => cust.Orders.FirstOrDefault().Price);
Console.WriteLine(name4);
Console.ReadLine();
}
} public class TypeInfoHelper
{
public static string GetPropertyName(Expression<Func<Object, Object>> propery)
{
var body = propery.Body.ToString();
return body.Substring(body.LastIndexOf(".") + );
} } public class Customer
{
public string Name { get; set; }
public string Remark { get; set; }
public int Flag { get; set; } public List<string> Contacts { get; set; }
public List<Order> Orders { get; set; }
} public class Order
{
public decimal Price { get; set; }
} public class Address
{
private Customer customer; public string Country { get; set; }
public string State { get; set; }
public string Street { get; set; } public Customer Owner
{
get { return customer; }
} public Address(Customer owner)
{
this.customer = owner;
}
} }