看到網友在論壇發問的問題，想起之前在開發時有用過反射與擴充方法去將物件初始，擴充方法如下，可將物件的屬性值初始：
public static class ObjectExtension
{
public static void Reset(this object obj)
{
foreach (var p in obj.GetType().GetProperties(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic))
{
if (!p.CanWrite)
continue;
var defaultValue = (p.GetCustomAttributes(typeof(DefaultValueAttribute), false) as DefaultValueAttribute[]).FirstOrDefault();
p.SetValue(obj, (defaultValue == null) ? (p.PropertyType.IsValueType ? Activator.CreateInstance(p.PropertyType) : null) : defaultValue.Value, null);
}
}
}
簡易的使用範例：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;
namespace ConsoleApplication13
{
class Program
{
static void Main(string[] args)
{
var people = new Person()
{
Name ="Larry",
Sex= Person.SexType.Boy,
Age=32
};
ShowPeople(people);
people.Reset();
Console.WriteLine(new string('=', 50));
ShowPeople(people);
}
static void ShowPeople(Person people)
{
Console.WriteLine(String.Format ("Name: {0}",people.Name));
Console.WriteLine(String.Format("Sex: {0}", people.Sex));
Console.WriteLine(String.Format("Age: {0}", people.Age));
}
}
public class Person
{
public enum SexType
{
Boy,
Girl
}
public string Name { get; set; }
public SexType Sex { get; set; }
[DefaultValue(18)]
public int Age { get; set; }
}
}
運行結果如下：