в 15:31, 26 мая 2010

2010-05-26T15:31:18Z

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2010-05-26T11:38:10Z

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==Attributes:Reflecting on Attributes==

<source lang="csharp">
using System;
using System.Reflection;
public class AttributesReflectingonAttributes
{
public static void Main()
{
Type type = typeof(Complex);
foreach (CodeReviewAttribute att in
type.GetCustomAttributes(typeof(CodeReviewAttribute), false))
{
Console.WriteLine("Reviewer: {0}", att.Reviewer);
Console.WriteLine("Date: {0}", att.Date);
Console.WriteLine("Comment: {0}", att.rument);
}
}
}
[AttributeUsage(AttributeTargets.Class, AllowMultiple=true)]
public class CodeReviewAttribute: System.Attribute
{
public CodeReviewAttribute(string reviewer, string date)
{
this.reviewer = reviewer;
this.date = date;
}
public string Comment
{
get
{
return(comment);
}
set
{
comment = value;
}
}
public string Date
{
get
{
return(date);
}
}
public string Reviewer
{
get
{
return(reviewer);
}
}
string reviewer;
string date;
string comment;
}

[CodeReview("AA", "01-12-2000", Comment="Joe" Code")]
[CodeReview("BB", "01-01-2000", Comment="Revisit this section")]
class Complex
{
}

</source>

==Displaying attributes for a class.==

<source lang="csharp">

using System;
using System.Reflection;
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct)]
public class Creator : System.Attribute {
public Creator(string name, string date) {
this.name = name;
this.date = date;
version = 0.1;
}
public void Dump() {
Console.WriteLine("Name {0}", name);
Console.WriteLine("Date {0}", date);
Console.WriteLine("Version {0}", version);
}
string date;
string name;
public double version;
}
[Creator("A", "01/01/2008", version = 1.1)]
class ATestClass1 {
ATestClass1() {
}
}
[Creator("B", "04/01/2008", version = 1.5)]
class ATestClass2 {
ATestClass2() {
}
}
[Creator("C", "12/31/2008", version = 2.5)]
class ATestClass3 {
ATestClass3() {
}
}

class MainClass {
public static void PrintAttributeInformation(Type classType) {
Console.WriteLine("Attributes for class {0}", classType);
object[] attr = classType.GetCustomAttributes(true);
foreach (object o in attr) {
Console.WriteLine("Attribute {0}", o);
if (o is Creator)
((Creator)o).Dump();
}
}
public static void Main() {
PrintAttributeInformation(typeof(ATestClass1));
PrintAttributeInformation(typeof(ATestClass2));
PrintAttributeInformation(typeof(ATestClass3));
}
}
</source>

==Use GetCustomAttribute==

<source lang="csharp">
using System;
using System.Reflection;

class Starter {
static void Main() {
Type tObj = typeof(Starter);
MethodInfo method = tObj.GetMethod("AMethod");
Attribute attrib = Attribute.GetCustomAttribute(method, typeof(ObsoleteAttribute));
ObsoleteAttribute obsolete = (ObsoleteAttribute)attrib;
Console.WriteLine("Obsolete Message: " + obsolete.Message);
}
[Obsolete("Deprecated function.", false)]
public void AMethod() {
}
}
</source>

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Csharp/C Sharp/Reflection/Attributes - История изменений

в 15:31, 26 мая 2010

Admin: 1 версия