в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

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2010-05-26T12:17:48Z

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==Create Delegate using reflection==

<source lang="csharp">using System;
using System.Reflection;
using System.Collections.Generic;
delegate void ComputeDelegate( Employee emp, Decimal percent );
public class Employee
{
public Decimal Salary;
public Employee( Decimal salary ) {
this.Salary = salary;
}
public void ApplyRaiseOf( Decimal percent ) {
Salary *= (1 + percent);
}
}
public class MainClass
{
static void Main() {
List<Employee> employees = new List<Employee>();
employees.Add( new Employee(20) );
employees.Add( new Employee(50) );
MethodInfo mi = typeof(Employee).GetMethod( "ApplyRaiseOf", BindingFlags.Public | BindingFlags.Instance );
ComputeDelegate applyRaise = (ComputeDelegate ) Delegate.CreateDelegate( typeof(ComputeDelegate), mi );
foreach( Employee e in employees ) {
applyRaise( e, (Decimal) 0.10 );
Console.WriteLine( e.Salary );
}
}
}</source>
<pre class=codeResult>22.0
55.0</pre>

==Get event from Type==

<source lang="csharp">using System;
using System.Reflection;
using System.Windows.Forms;
public class Class1
{
static void Main( string[] args )
{
Type type = typeof(MyClass);
object o = Activator.CreateInstance(type);

EventInfo eventInfo = type.GetEvent("Changed");
eventInfo.AddEventHandler(o, new EventHandler(Class1.OnChanged));
((MyClass)o).Text = "New Value";
}
private static void OnChanged(object sender , System.EventArgs e)
{
Console.WriteLine(((MyClass)sender).Text);
}
}
public class MyClass
{
private string text;

public string Text
{
get{ return text; }
set
{
text = value;
OnChanged();
}
}

private void OnChanged()
{
if( Changed != null )
Changed(this, System.EventArgs.Empty);
}

public event EventHandler Changed;
}</source>

==Get/set private field using InvokeMember==

<source lang="csharp">using System;
using System.Reflection;
using System.Windows.Forms;
public class Class1
{
static void Main( string[] args )
{
Type type = typeof(MyClass);
object o = Activator.CreateInstance(type);

type.InvokeMember("text", BindingFlags.SetField | BindingFlags.NonPublic | BindingFlags.Instance, null, o, new object[]{"C#"});
string text = (string)type.InvokeMember("text", BindingFlags.GetField | BindingFlags.NonPublic | BindingFlags.Instance, null, o, new object[]{});

}
private static void OnChanged(object sender , System.EventArgs e)
{
Console.WriteLine(((MyClass)sender).Text);
}
}
public class MyClass
{
private string text;

public string Text
{
get{ return text; }
set
{
text = value;
OnChanged();
}
}

private void OnChanged()
{
if( Changed != null )
Changed(this, System.EventArgs.Empty);
}

public event EventHandler Changed;
}</source>

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Csharp/CSharp Tutorial/Reflection/Delegate - История изменений

в 15:31, 26 мая 2010

Admin: 1 версия