转自：
http://blog.joycode.com/zhanbos/archive/2004/05/25/22402.aspx
ASP.NET 2.0和Avalon都使用了Partial Class. 这样用户的代码和工具生成的代码可以共同组成一个Class.对Partial Type的支持来自编译器. 4个要点如下:
我们把partial 叫做modifier而不是关键字. 同一类型在不同文件里面都需要使用partial 可以只在一个文件,两个文件,或者更多文件中使用partial Base class只需要声明一次;若多次声明必需完全一致.
例子:
Contact1.cs
using
System;
namespace
Realize.Net.Potential.Sample1
...
{ public partial class Contact ...{ public Contact(string firstName, string lastName) ...{ this.firstName = firstName; this.lastName = lastName; } int partial = 0; private void PartialIsNotAKeyword() ...{ partial++; } } public partial class AdvancedContact: Contact ...{ public AdvancedContact(string firstName, string lastName, string address) : base(firstName, lastName) ...{ this.address = address; } } }
Contact2.cs
using
System;
namespace
Realize.Net.Potential.Sample1
...
{ public partial class Contact ...{ string firstName; string lastName; } }
Contact3.cs
using
System;
namespace
Realize.Net.Potential.Sample1
...
{ public partial class Contact ...{ public virtual string Name ...{ get ...{ return firstName + " " + lastName; } } } public partial class AdvancedContact ...{ string address; public override string Name ...{ get ...{ return base.Name + " at " + address; } } } }
MainFun.cs
using
System;
namespace
Realize.Net.Potential.Sample1
...
{ public class MainFunc ...{ [STAThread] static int Main (string[] args) ...{ Contact contact = new Contact("Zhanbo", "Sun"); Console.WriteLine(contact.Name); AdvancedContact advContact = new AdvancedContact("Zhanbo", "Sun", " 1 Microsoft Way "); Console.WriteLine(advContact.Name); return 0; } } }
To Compile:
csc /out:MySample1.exe /t:exe *.cs
深入了解Generics, iterators, anonymous methods, and partial classes的最佳读本就是更新的
C#2.0Specification.
