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;
}
}
}
using System;
namespace Realize.Net.Potential.Sample1
...{
public partial class Contact
...{
string firstName;
string lastName;
}
}
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;
}
}
}
}
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;
}
}
}
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.