日期:2010-02-22 浏览次数:20441 次
这个话题是仁者见仁,智者见智,这里我也谈谈自己对.NET反射封装的思路,请先看下面的示例代码:
static void Main(string[] args)
{
Person liu = new Person("liu", 26);
Reflector reflector = new Reflector(liu);
//获取属性
string name = reflector.Property<string>("Name");
int age = reflector.Property<int>("Age");
Console.WriteLine(name + " " + age);
//修改属性
age = reflector.SetProperty<int>("Age", 27);
Console.WriteLine(name + " " + age);
//获取过程
Proc<string> sayHello = reflector.Proc<string>("SayHello");
sayHello("Ling");
//获取函数
Func<int> getAge = reflector.Func<int>("GetAge");
age = getAge();
Console.WriteLine(age);
Console.ReadLine();
}
public class Person
{
private string name;
private int age;
public Person(string name, int age)
{
this.name = name;
this.age = age;
}
public string Name
{
get { return name; }
}
public int Age
{
get { return age; }
set { age = value; }
}
public void SayHello(string who)
{
Console.WriteLine("Say Hello to " + who);
}
public int GetAge()
{
return age;
}
}
相信您已经从代码看出了封装的思路:利用泛型和泛型委托为动态的反射添加静态的类型约束。下面我们就来简单看一下Reflector实现的关键部分:
public delegate void Proc();
public delegate void Proc<T1>(T1 arg1);
public delegate void Proc<T1, T2>(T1 arg1, T2 args);
public delegate void Proc<T1, T2, T3>(T1 arg1, T2 args, T3 arg3);
public delegate void Proc<T1, T2, T3, T4>(T1 arg1, T2 args, T3 arg3, T4 arg4);
public delegate void Proc<T1, T2, T3, T4, T5>(T1 arg1, T2 args, T3 arg3, T4 arg4, T5 arg5);
public delegate R Func<R>();
public delegate R Func<T1, R>(T1 arg1);
public delegate R Func<T1, T2, R>(T1 arg1, T2 args);
public delegate R Func<T1, T2, T3, R>(T1 arg1, T2 args, T3 arg3);
public delegate R Func<T1, T2, T3, T4, R>(T1 arg1, T2 args, T3 arg3, T4 arg4);
public delegate R Func<T1, T2, T3, T4, T5, R>(T1 arg1, T2 args, T3 arg3, T4 arg4, T5 arg5);
public class Reflector
{
private object target;
public object Target
{
get { return target; }
}
public T Property<T>(string name)
{
PropertyInfo pi = target.GetType().GetProperty(name, typeof(T));
if (null != pi && pi.CanRead)
{
object value = pi.GetValue(target, null);
if (null != value)
{
return (T)value;
}
}
return default(T);
}
public T SetProperty<T>(string name, T value)
{
PropertyInfo pi = target.GetType().GetProperty(name, typeof(T));
if (null != pi && pi.CanWrite)
{
pi.SetValue(target, value, null);
}
return value;
}
public Proc Proc(string name)
{
MethodInfo mi = target.GetType().GetMethod(name, Type.EmptyTypes);
if (null != mi)
{
return Delegate.CreateDelegate(typeof(Proc), target, mi.Name, false) as Proc;
}
return null;
}
public Proc<T> Proc<T>(string name)
{
MethodInfo mi = target.GetType().GetMethod(name, new Type[] { typeof(T) });
if (null != mi)
{
return Delegate.CreateDelegate(typeof(Proc<T>), target, mi.Name, false) as Proc<T>;
}
return null;
}
public Proc<T1, T2> Proc<T1, T2>(string name)
{
MethodInfo mi = target.GetType().GetMethod(name, new Type[] { typeof(T1), typeof(T2) });
if (null != mi)
{
return Delegate.CreateDelegate(typeof(Proc<T1, T2>), target, mi