GC.GetGeneration メソッド
オブジェクトの現在のジェネレーション番号を返します。
オーバーロードの一覧
指定したオブジェクトの現在のジェネレーション番号を返します。
[Visual Basic] Overloads Public Shared Function GetGeneration(Object) As Integer
[JScript] public static function GetGeneration(Object) : int;
指定した弱い参照の対象となる現在のジェネレーション番号を返します。
[Visual Basic] Overloads Public Shared Function GetGeneration(WeakReference) As Integer
[JScript] public static function GetGeneration(WeakReference) : int;
使用例
[Visual Basic, C#, C++] メモ ここでは、GetGeneration のオーバーロード形式のうちの 1 つだけについて、使用例を示します。その他の例については、各オーバーロード形式のトピックを参照してください。
Imports System
Namespace GCGetGenerationWeakExample
Class MyGCCollectClass
Private maxGarbage As Long = 1000
Public Shared Sub Main()
' Create a strong reference to an object.
Dim myGCCol As New MyGCCollectClass
' Put some objects in memory.
myGCCol.MakeSomeGarbage()
' Get the generation of managed memory where myGCCol is stored.
Console.WriteLine("The object is in generation: {0}", _
GC.GetGeneration(myGCCol))
' Perform a full garbage collection.
' Because there is a strong reference to myGCCol, it will
' not be garbage collected.
GC.Collect()
' Get the generation of managed memory where myGCCol is stored.
Console.WriteLine("The object is in generation: {0}", _
GC.GetGeneration(myGCCol))
' Create a WeakReference to myGCCol.
Dim wkref As New WeakReference(myGCCol)
' Remove the strong reference to myGCCol.
myGCCol = Nothing
' Get the generation of managed memory where wkref is stored.
Console.WriteLine("The WeakReference to the object is in generation: {0}", _
GC.GetGeneration(wkref))
' Perform another full garbage collection.
' A WeakReference will not survive a garbage collection.
GC.Collect()
' Try to get the generation of managed memory where wkref is stored.
' Because it has been collected, an exception will be thrown.
Try
Console.WriteLine("The WeakReference to the object is in generation: {0}", _
GC.GetGeneration(wkref))
Console.Read()
Catch e As Exception
Console.WriteLine("The WeakReference to the object " & _
"has been garbage collected: '{0}'", e)
Console.Read()
End Try
End Sub
Sub MakeSomeGarbage()
Dim vt As Version
Dim i As Integer
For i = 0 To maxGarbage - 1
' Create objects and release them to fill up memory
' with unused objects.
vt = New Version
Next i
End Sub
End Class
End Namespace
[C#]
using System;
namespace GCGetGenerationWeakExample
{
public class MyGCCollectClass
{
private const long maxGarbage = 1000;
static void Main()
{
// Create a strong reference to an object.
MyGCCollectClass myGCCol = new MyGCCollectClass();
// Put some objects in memory.
myGCCol.MakeSomeGarbage();
// Get the generation of managed memory where myGCCol is stored.
Console.WriteLine("The object is in generation: {0}", GC.GetGeneration(myGCCol));
// Perform a full garbage collection.
// Because there is a strong reference to myGCCol, it will
// not be garbage collected.
GC.Collect();
// Get the generation of managed memory where myGCCol is stored.
Console.WriteLine("The object is in generation: {0}", GC.GetGeneration(myGCCol));
// Create a WeakReference to myGCCol.
WeakReference wkref = new WeakReference(myGCCol);
// Remove the strong reference to myGCCol.
myGCCol = null;
// Get the generation of managed memory where wkref is stored.
Console.WriteLine("The WeakReference to the object is in generation: {0}", GC.GetGeneration(wkref));
// Perform another full garbage collection.
// A WeakReference will not survive a garbage collection.
GC.Collect();
// Try to get the generation of managed memory where wkref is stored.
// Because it has been collected, an exception will be thrown.
try
{
Console.WriteLine("The WeakReference to the object is in generation: {0}", GC.GetGeneration(wkref));
Console.Read();
}
catch(Exception e)
{
Console.WriteLine("The WeakReference to the object has been garbage collected: '{0}'", e);
Console.Read();
}
}
void MakeSomeGarbage()
{
Version vt;
for(int i = 0; i < maxGarbage; i++)
{
// Create objects and release them to fill up memory
// with unused objects.
vt = new Version();
}
}
}
}
[C++]
#using <mscorlib.dll>
using namespace System;
__gc class MyGCCollectClass {
static const long maxGarbage = 1000;
public:
void MakeSomeGarbage() {
Version* vt;
for (int i = 0; i < maxGarbage; i++) {
// Create objects and release them to fill up memory
// with unused objects.
vt = new Version();
}
}
};
int main() {
// Create a strong reference to an Object.
MyGCCollectClass* myGCCol = new MyGCCollectClass();
// Put some objects in memory.
myGCCol->MakeSomeGarbage();
// Get the generation of managed memory where myGCCol is stored.
Console::WriteLine(S"The object is in generation: {0}", __box(GC::GetGeneration(myGCCol)));
// Perform a full garbage collection.
// Because there is a strong reference to myGCCol, it will
// not be garbage collected.
GC::Collect();
// Get the generation of managed memory where myGCCol is stored.
Console::WriteLine(S"The object is in generation: {0}", __box( GC::GetGeneration(myGCCol)));
// Create a WeakReference to myGCCol.
WeakReference* wkref = new WeakReference(myGCCol);
// Remove the strong reference to myGCCol.
myGCCol = 0;
// Get the generation of managed memory where wkref is stored.
Console::WriteLine(S"The WeakReference to the object is in generation: {0}", __box( GC::GetGeneration(wkref)));
// Perform another full garbage collection.
// A WeakReference will not survive a garbage collection.
GC::Collect();
// Try to get the generation of managed memory where wkref is stored.
// Because it has been collected, an exception will be thrown.
try {
Console::WriteLine(S"The WeakReference to the object is in generation: {0}", __box( GC::GetGeneration(wkref)));
Console::Read();
} catch (Exception* e) {
Console::WriteLine(S"The WeakReference to the object has been garbage collected: ' {0}'", e);
}
}
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参照
GC クラス | GC メンバ | System 名前空間