в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

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2010-05-26T12:14:42Z

1 версия

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==Clean up gen 0==

<source lang="csharp">using System;
public class MyClass : IDisposable
{
~MyClass()
{
Console.WriteLine("In destructor!");
}

public void Dispose()
{
Console.WriteLine("In Dispose() for {0}!");
GC.SuppressFinalize(this);
}
}
public class MainClass
{
public static void Main(string[] args)
{
MyClass c1, c2, c3, c4;
c1 = new MyClass();
c2 = new MyClass();
c3 = new MyClass();
c4 = new MyClass();

Console.WriteLine("\n***** Disposing c1 and c3 *****");
c1.Dispose();
c3.Dispose();
Console.WriteLine("***** Sweaping gen 0 *****");
GC.Collect(0);
Console.WriteLine("\n***** New generations *****");
Console.WriteLine("C1 is gen {0}", GC.GetGeneration(c1));
Console.WriteLine("C2 is gen {0}", GC.GetGeneration(c2));
Console.WriteLine("C3 is gen {0}", GC.GetGeneration(c3));
Console.WriteLine("C4 is gen {0}", GC.GetGeneration(c4));
}
}</source>
<pre class=codeResult>***** Disposing c1 and c3 *****
In Dispose() for {0}!
In Dispose() for {0}!
***** Sweaping gen 0 *****
***** New generations *****
C1 is gen 1
C2 is gen 1
C3 is gen 1
C4 is gen 1
In destructor!
In destructor!</pre>

==Display current generations==

<source lang="csharp">using System;
public class MyClass : IDisposable
{
~MyClass()
{
Console.WriteLine("In destructor!");
}

public void Dispose()
{
Console.WriteLine("In Dispose() for {0}!");
GC.SuppressFinalize(this);
}
}
public class MainClass
{
public static void Main(string[] args)
{
MyClass c1, c2, c3, c4;
c1 = new MyClass();
c2 = new MyClass();
c3 = new MyClass();
c4 = new MyClass();

Console.WriteLine("\n***** Displaying generation of cars *****");
Console.WriteLine("C1 is gen {0}", GC.GetGeneration(c1));
Console.WriteLine("C2 is gen {0}", GC.GetGeneration(c2));
Console.WriteLine("C3 is gen {0}", GC.GetGeneration(c3));
Console.WriteLine("C4 is gen {0}", GC.GetGeneration(c4));
}
}</source>
<pre class=codeResult>***** Displaying generation of cars *****
C1 is gen 0
C2 is gen 0
C3 is gen 0
C4 is gen 0
In destructor!
In destructor!
In destructor!
In destructor!</pre>

==Forced garbage collection==

<source lang="csharp">using System;
class Junk
{
public Junk()
{
Console.WriteLine("Created Junk");
}
~Junk()
{
Console.WriteLine("Destroyed Junk");
}
}
class MainClass
{
public static void Main()
{
Junk j = new Junk();
j = null;
GC.Collect();
}
}</source>
<pre class=codeResult>Created Junk
Destroyed Junk</pre>

==Garbage collection type==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Text;
using System.Security.Cryptography;
public class MainClass
{
public static void Main()
{
Console.WriteLine("TotalMemory: {0}", GC.GetTotalMemory(false));
Console.WriteLine("(forcing a GC...)");
GC.Collect();
Console.WriteLine("TotalMemory: {0}", GC.GetTotalMemory(false));
}
}</source>
<pre class=codeResult>TotalMemory: 141036
(forcing a GC...)
TotalMemory: 153444</pre>

==Get total memory==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Text;
using System.Security.Cryptography;
public class MainClass
{
public static void Main()
{
Console.WriteLine("TotalMemory: {0}", GC.GetTotalMemory(false));
Console.WriteLine("(forcing a GC...)");
GC.Collect();
Console.WriteLine("TotalMemory: {0}", GC.GetTotalMemory(false));
}
}</source>
<pre class=codeResult>TotalMemory: 141036
(forcing a GC...)
TotalMemory: 153444</pre>

==weak references==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Text;
using System.Security.Cryptography;
public class MainClass
{
public static void Main()
{
object target = new object();
WeakReference wr = new WeakReference(target);
Console.WriteLine("IsAlive: {0}", wr.IsAlive);
GC.Collect();
Console.WriteLine("IsAlive: {0}", wr.IsAlive);
}
}</source>
<pre class=codeResult>IsAlive: True
IsAlive: False</pre>

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Csharp/CSharp Tutorial/Development/GC - История изменений

в 15:31, 26 мая 2010

Admin: 1 версия