в 15:31, 26 мая 2010

2010-05-26T15:31:35Z

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2010-05-26T12:11:56Z

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==Attribute.GetCustomAttribute==

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

[AttributeUsage(AttributeTargets.All)]
class RemarkAttribute : Attribute {
string remarkValue; // underlies remark property

public string supplement; // this is a named parameter

public RemarkAttribute(string comment) {
remarkValue = comment;
supplement = "None";
}

public string remark {
get {
return remarkValue;
}
}
}

[RemarkAttribute("This class uses an attribute.",
supplement = "This is additional info.")]
class UseAttrib {
// ...
}

public class NamedParamDemo {
public static void Main() {
Type t = typeof(UseAttrib);

Console.Write("Attributes in " + t.Name + ": ");

object[] attribs = t.GetCustomAttributes(false);
foreach(object o in attribs) {
Console.WriteLine(o);
}

// Retrieve the RemarkAttribute.
Type tRemAtt = typeof(RemarkAttribute);
RemarkAttribute ra = (RemarkAttribute)
Attribute.GetCustomAttribute(t, tRemAtt);

Console.Write("Remark: ");
Console.WriteLine(ra.remark);

Console.Write("Supplement: ");
Console.WriteLine(ra.supplement);
}
}

</source>

==Attribute.GetCustomAttribute(Type t, Type tR);==

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

[AttributeUsage(AttributeTargets.All)]
public class MyAttribute : Attribute {
public string remark;

public string supplement;

public MyAttribute(string comment) {
remark = comment;
supplement = "None";
}

public string Remark {
get {
return remark;
}
}
}

[MyAttribute("This class uses an attribute.",
supplement = "This is additional info.")]
class UseAttrib {
}

class MainClass {
public static void Main() {
Type t = typeof(UseAttrib);

Console.Write("Attributes in " + t.Name + ": ");

object[] attribs = t.GetCustomAttributes(false);
foreach(object o in attribs) {
Console.WriteLine(o);
}

// Retrieve the MyAttribute.
Type tRemAtt = typeof(MyAttribute);
MyAttribute ra = (MyAttribute)
Attribute.GetCustomAttribute(t, tRemAtt);

Console.Write("Remark: ");
Console.WriteLine(ra.remark);

Console.Write("Supplement: ");
Console.WriteLine(ra.supplement);
}
}

</source>

==Attribute.Remove()==

<source lang="csharp">
using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Xml;
using System.Xml.Linq;
public class MainClass {
public static void Main() {
XElement firstParticipant;
XDocument xDocument = new XDocument(
new XElement("Books", firstParticipant =
new XElement("Book",
new XAttribute("type", "Author"),
new XElement("FirstName", "J"),
new XElement("LastName", "R"))));
Console.WriteLine(xDocument);
firstParticipant.Attribute("type").Remove();
Console.WriteLine(xDocument);
}
}

</source>

==Attribute.Value==

<source lang="csharp">
using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Xml;
using System.Xml.Linq;
public class MainClass {
public static void Main() {
XElement firstParticipant;
XDocument xDocument = new XDocument(
new XElement("Books", firstParticipant =
new XElement("Book",
new XAttribute("type", "Author"),
new XAttribute("experience", "first-time"),
new XElement("FirstName", "J"),
new XElement("LastName", "R"))));
Console.WriteLine(xDocument);
firstParticipant.Attribute("experience").Value = "beginner";
Console.WriteLine(xDocument);
}
}

</source>

==extends Attribute==

<source lang="csharp">
using System;

public class MainClass
{
public static void Main()
{
UnitTest u;
Console.Write("Class1 UnitTest attribute: ");
u = (UnitTest) Attribute.GetCustomAttribute(typeof(Class1), typeof(UnitTest));
Console.WriteLine(u.Written());
Console.Write("Class2 UnitTest attribute: ");
u = (UnitTest) Attribute.GetCustomAttribute(typeof(Class2), typeof(UnitTest));
Console.WriteLine(u.Written());
}
}

public class UnitTest : Attribute
{
bool bWritten;
public bool Written()
{
return bWritten;
}
public UnitTest(bool Written)
{
bWritten = Written;
}
}
// apply the UnitTest attribute to two classes
[UnitTest(true)]
public class Class1
{
}
[UnitTest(false)]
public class Class2
{
}

</source>

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в 15:31, 26 мая 2010

Admin: 1 версия