Attribute

2006-03-01 03:07:41 108 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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在自定义的attribute类当中是否可以添加自已定义的方法？如果可以的希望能提供一个例子。还有，如何使用Attribute类，在使用用时应注意那些问题？

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luishu

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luishu 2006-03-01

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你没有回到我问题的主题。

xujiaoxiang 2006-03-01

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下面的代码实例说明了 Attribute 的用法：

[Visual Basic]
Imports System
Imports System.Reflection

Public Module CustomAttrVB

' An enumeration of animals. Start at 1 (0 = uninitialized).
Public Enum Animal
' Pets
Dog = 1
Cat
Bird
End Enum

' Visual Basic requires the AttributeUsage be specified.
' A custom attribute to allow a target to have a pet.
<AttributeUsage(AttributeTargets.Method)> _
Public Class AnimalTypeAttribute
Inherits Attribute

' The constructor is called when the attribute is set.
Public Sub New(ByVal animal As Animal)
Me.thePet = animal
End Sub

' Keep a variable internally ...
Protected thePet As Animal

' .. and show a copy to the outside world.
Public Property Pet() As Animal
Get
Return thePet
End Get
Set(ByVal Value As Animal)
thePet = Value
End Set
End Property

End Class

' A test class where each method has its own pet.
Class AnimalTypeTestClass

<AnimalType(Animal.Dog)> _
Public Sub DogMethod()
End Sub

<AnimalType(Animal.Cat)> _
Public Sub CatMethod()
End Sub

<AnimalType(Animal.Bird)> _
Public Sub BirdMethod()
End Sub
End Class

' The runtime test.
Sub Main()
Dim testClass As New AnimalTypeTestClass()
Dim tcType As Type = testClass.GetType()
Dim mInfo As MethodInfo
' Iterate through all the methods of the class.
For Each mInfo In tcType.GetMethods()
Dim attr As Attribute
' Iterate through all the attributes of the method.
For Each attr In Attribute.GetCustomAttributes(mInfo)
If TypeOf attr Is AnimalTypeAttribute Then
Dim attrCustom As AnimalTypeAttribute = _
CType(attr, AnimalTypeAttribute)
Console.WriteLine("Method {0} has a pet {1} attribute.", _
mInfo.Name(), attrCustom.Pet.ToString())
End If
Next
Next
End Sub
End Module

' Output:
' Method DogMethod has a pet Dog attribute.
' Method CatMethod has a pet Cat attribute.
' Method BirdMethod has a pet Bird attribute.

[C#]
using System;
using System.Reflection;

namespace CustomAttrCS {
// An enumeration of animals. Start at 1 (0 = uninitialized).
public enum Animal {
// Pets.
Dog = 1,
Cat,
Bird,
}

// A custom attribute to allow a target to have a pet.
public class AnimalTypeAttribute : Attribute {
// The constructor is called when the attribute is set.
public AnimalTypeAttribute(Animal pet) {
thePet = pet;
}

// Keep a variable internally ...
protected Animal thePet;

// .. and show a copy to the outside world.
public Animal Pet {
get { return thePet; }
set { thePet = Pet; }
}
}

// A test class where each method has its own pet.
class AnimalTypeTestClass {
[AnimalType(Animal.Dog)]
public void DogMethod() {}

[AnimalType(Animal.Cat)]
public void CatMethod() {}

[AnimalType(Animal.Bird)]
public void BirdMethod() {}
}

class DemoClass {
static void Main(string[] args) {
AnimalTypeTestClass testClass = new AnimalTypeTestClass();
Type type = testClass.GetType();
// Iterate through all the methods of the class.
foreach(MethodInfo mInfo in type.GetMethods()) {
// Iterate through all the Attributes for each method.
foreach (Attribute attr in
Attribute.GetCustomAttributes(mInfo)) {
// Check for the AnimalType attribute.
if (attr.GetType() == typeof(AnimalTypeAttribute))
Console.WriteLine(
"Method {0} has a pet {1} attribute.",
mInfo.Name, ((AnimalTypeAttribute)attr).Pet);
}

}
}
}
}

/*
* Output:
* Method DogMethod has a pet Dog attribute.
* Method CatMethod has a pet Cat attribute.
* Method BirdMethod has a pet Bird attribute.
*/

是这个Attribute 吗？

startray 2006-03-01

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this.Button1.Attributes.Add["onclick"]="";

Attribute

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