用Activator.CreatInstance动态的创建同一个Assembly的对象
在正常的工厂类中，我们会有很多的switch case之类的，如何避免他们，我们可以利用.Net的Activator帮我们简单的完成这件事情。目前，经过简单大测试，支持public的构造函数，internal private的都还没有仔细看
因为我关心的是public的构造函数。
研究这个的起因在于，我想用基于配置文件的形式来动态的创建DataAccess对象。
主要是由于我的构造函数参数是一个自定义的类，不是系统的基本数据类型。昨天测试的时候不知道怎么回事发生了问题，所以，今天早上才写了如下的测试代码，发觉真的很喜欢Snippet Compiler
using System;
using System.Reflection;
using System.Collections;
namespace FishSky.Testing
{
public class DesireSay
{
public DesireSay()
{
}
private string mWords;
public string Words
{
get{ return mWords;}
set{ mWords=value;}
}
}
public class SayHello
{
private string mIWannaSay="";
private DesireSay mDesireSay;
private int mInternalInt=-1;
public SayHello()
{
}
public SayHello(string iWannaSay)
{
mIWannaSay=iWannaSay;
}
public SayHello(DesireSay desireSay)
{
mDesireSay=desireSay;
}
internal SayHello(int internalInt)
{
mInternalInt=internalInt;
}
public string Hello()
{
if(mInternalInt!=-1)
{
return mInternalInt.ToString();
}
else
{
if(mDesireSay!=null)
{
return mDesireSay.Words;
}
else
{
if(mIWannaSay=="")
return "Hello";
else
return mIWannaSay;
}
}
}
}
public class MyClass
{
public static void Main()
{
string TypeName="FishSky.Testing.SayHello";
Type type=Type.GetType(TypeName,true);
SayHello hello=(SayHello) Activator.CreateInstance(type);
WL("SayHello says {0}",hello.Hello());
Console.WriteLine("Next Test with string parameter in constructor
..");
SayHello hello2=(SayHello) Activator.CreateInstance(type,new Object[]{"I wanna say Hello!"});
WL("SayHello says {0}",hello2.Hello());
Console.WriteLine("Next Test with Class parameter in constructor..");
DesireSay desireSay=new DesireSay();
desireSay.Words="I Desire say!Let me say!";
SayHello hello3=(SayHello) Activator.CreateInstance(type,new Object[]{desireSay});
WL("SayHello says {0}",hello3.Hello());
// Console.WriteLine("Next Test with int parameter in internal constructor..");
// SayHello hello4=(SayHello) Activator.CreateInstance(type,new Object[]{250});
// //SayHello hello4=(SayHello)Activator.CreateInstance(type,BindingFlags.NonPublic,null,new object[250],new CultureInfo());
// WL("SayHello says {0}",hello4.Hello());
RL();
}
Helper methods
}
}
因为我关心的是public的构造函数。研究这个的起因在于，我想用基于配置文件的形式来动态的创建DataAccess对象。
主要是由于我的构造函数参数是一个自定义的类，不是系统的基本数据类型。昨天测试的时候不知道怎么回事发生了问题，所以，今天早上才写了如下的测试代码，发觉真的很喜欢Snippet Compiler
using System;using System.Reflection;using System.Collections;namespace FishSky.Testing{
public class DesireSay{ public DesireSay() { } private string mWords; public string Words { get{ return mWords;} set{ mWords=value;} } }public class SayHello{ private string mIWannaSay=""; private DesireSay mDesireSay; private int mInternalInt=-1; public SayHello() { } public SayHello(string iWannaSay) { mIWannaSay=iWannaSay; } public SayHello(DesireSay desireSay) { mDesireSay=desireSay; } internal SayHello(int internalInt) { mInternalInt=internalInt; } public string Hello() { if(mInternalInt!=-1) { return mInternalInt.ToString(); } else { if(mDesireSay!=null) { return mDesireSay.Words; } else { if(mIWannaSay=="") return "Hello"; else return mIWannaSay; } } } }public class MyClass{ public static void Main() { string TypeName="FishSky.Testing.SayHello"; Type type=Type.GetType(TypeName,true); SayHello hello=(SayHello) Activator.CreateInstance(type); WL("SayHello says {0}",hello.Hello()); Console.WriteLine("Next Test with string parameter in constructor.."); SayHello hello2=(SayHello) Activator.CreateInstance(type,new Object[]{"I wanna say Hello!"}); WL("SayHello says {0}",hello2.Hello()); Console.WriteLine("Next Test with Class parameter in constructor.."); DesireSay desireSay=new DesireSay(); desireSay.Words="I Desire say!Let me say!"; SayHello hello3=(SayHello) Activator.CreateInstance(type,new Object[]{desireSay}); WL("SayHello says {0}",hello3.Hello());// Console.WriteLine("Next Test with int parameter in internal constructor..");// SayHello hello4=(SayHello) Activator.CreateInstance(type,new Object[]{250});// //SayHello hello4=(SayHello)Activator.CreateInstance(type,BindingFlags.NonPublic,null,new object[250],new CultureInfo());// WL("SayHello says {0}",hello4.Hello()); RL(); } Helper methods}}
