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.NET Framework & C#
Module 12.2 Garbage Collector
 仂仄 仄仂亟仍:
 亳于亳亶 亳从仍 仂弍从于
 仂仆 亰弍亳舒舒 仄仂
 亠从仂  仄亠仂亟 Finalize
 亠仂亟 Dispose  仆亠亠亶 IDispose
 仍舒 System.GC
 仂仆 仗仂从仂仍仆 仗亳 亰弍亳舒仆仆 仄仂
2
Andrii Hladkyi
trilobt@gmail.com
亳于亳亶 亳从仍 仂弍从于
 亳于亳亶 亳从仍 弍亟 磻仂亞仂 仂弍'从舒 仄仂亢仆舒 仗仂亟舒亳 舒从:
 于亳亟仍亠仆仆 仗舒仄' 亟仍 亳仗;
 仆舒仍亰舒 于亳亟仍亠仆仂 仗舒仄' (舒仆仂于从舒 仂弍'从舒 于 仗仂舒从仂于亠 亰仆舒亠仆仆,
于亳从仍亳从 从仂仆从仂舒);
 于亳从仂亳舒仆仆 仂弍'从舒 于 仗仂亞舒仄;
 亶仆舒 舒仆 仂弍'从舒;
 亰于仍仆亠仆仆 亰舒亶仆仂 仗舒仄'.
 丕仗舒于仍仆仆 亢亳于亳仄 亳从仍仂仄 仂弍'从于 磦仍 仂弍仂 于舒亢从 亰舒亟舒  
仗仂亶仆亳仄 亟亢亠亠仍仂仄 仗仂仄亳仍仂从. 丐仂仄 弍于 仂亰仂弍仍亠仆亳亶 舒于仂仄舒亳仆亳亶
仄亠舒仆亰仄 仗舒于仍仆仆 仗舒仄'  亰弍 仄.
Andrii Hladkyi
trilobt@gmail.com 3
仂仆 亰弍亳舒舒 仄仂
 弍 仄 亰于仍仆 仗仂亞舒仄舒 于亟 仆亠仂弍亟仆仂 仗仂亶仆仂 亠亢亳亳 亰舒
于亳从仂亳舒仆仆礆  于仂舒仆亳仄 亰于仍仆亠仆仆礆 仗舒仄'.
 弌仗亠舒仍仆亳亶 从仂亟, 磻亳亶 亰亟亶仆ム 亰弍 仄 仆舒亰亳于舒 束亰弍亳舒 仄晛 (Garbage
Collector).
 弍亳舒 仄 于亟亠亢  亰仆亳 仂弍'从亳, 仂 亰仆舒仂亟 于 从亠仂于舒仆仂 仗舒仄'.
 弍亳舒仆仆 仄 舒于仂仄舒亳仆仂 亰舒仗从舒 于 舒亰, 磻仂 仆亠仂弍亟仆亳亶 仂弍磪 仗舒仄'
弍仍亠 亟仂仗仆仂亞仂 仂弍磪 于仍仆仂 仗舒仄'. 仄 仂亞仂, 仗仂亞舒仄舒 仄仂亢亠 仗亳仄仂于仂
亰舒仗亳亳 亰弍从 仄 亰舒 亟仂仗仂仄仂亞仂 仄亠仂亟 Collect 从仍舒 System.GC.
弍亳舒仆仆 仄 从仍舒亟舒 亰 舒从亳 从仂从于:
 弍亳舒 仄 亰亟亶仆ム 仗仂从 从亠仂于舒仆亳 仂弍'从于, 仆舒 磻  仗仂亳仍舒仆仆 于
从亠仂于舒仆仂仄 从仂亟.
 弍亳舒 仄 仆舒仄舒亞舒 亰舒于亠亳亳 仂弍'从亳, 仆舒 磻 仆亠仄舒 仗仂亳仍舒仆.
 弍亳舒 仄 亰于仍仆 仂弍'从亳, 仆舒 磻 仆亠仄舒 仗仂亳仍舒仆,  于亳于仍仆 于亳亟仍亠仆 仄
仗舒仄'.
Andrii Hladkyi
trilobt@gmail.com 4
亠从仂  仄亠仂亟 Finalize
 弍亳舒 仄 于仄 舒于仂仄舒亳仆仂 亶仆于舒亳 仗仂 仂弍'从亳 (舒从, 磻
String, Delegate  仆.)  亰于仍仆亳 亰舒亶仄舒仆 仆亳仄亳 仗舒仄'. 乂仂 亢
仂 从仍舒亟仆亳 亳仗于, 仂  亰弍亳舒 仄 仗舒于亳仍仆仂 亶仆于舒亳 仆亠
于仄,  仂仄 仆亠仂弍亟仆仂 仗亳舒亳 仗亠舒仍仆亳亶 亠从亰亠仄仗仍仆亳亶 从仂亟 亟仍
仗舒于亳仍仆仂亞仂 亰仆亳亠仆仆 仂弍'从舒.
 仍 舒从亳 亳仗于 C# 仗亟亳仄 仗亠舒仍仆亳亶 仄亠舒仆亰仄, 亰于舒仆亳亶
仆舒仍亰舒 仂弍'从于 (finalization). 仍 于亳从仂仆舒仆仆 仂亞仂 仄亠舒仆亰仄
仂弍'从 仗仂于亳仆亠仆 亠舒仍亰于舒亳 仂亟仆仂亶仄亠仆仆亳亶 仄亠仂亟 (Finalize), 磻亳亶 弍亟亠
于亳从仍亳从舒仆亳亶 亰弍亳舒亠仄 仄 弍亠亰仗仂亠亠亟仆仂 仗亠亠亟 亶仂亞仂 亰仆亳亠仆仆礆.
  C# 亟仍 于亳亰仆舒亠仆仆 亰舒于亠于舒舒 于亳从仂亳仂于 亳仍亟舒 (~)  仄'
从仍舒.
 亠亠于舒仆舒亢于舒亳 仆舒仍亰舒仂  于亳从仂亳仂于于舒亳 于 仆仂仄 仗舒舒仄亠亳 仆亠
仄仂亢仆舒.
Andrii Hladkyi
trilobt@gmail.com 5
Andrii Hladkyi
trilobt@gmail.com 6
亠仄仂仆舒
亠仂亟 Dispose  仆亠亠亶 IDispose
 亠仂亟 Finalize () 弍亠亰仗仂亠亠亟仆仂 于亳从仍亳从舒亳 仆亠 仄仂亢仆舒 - 亶仂亞仂 于亳从仍亳从舒
Garbage Collector 仗亳 亶仆于舒仆仆 仂弍'从舒 仗亟 舒 亰弍从亳 仄.
 仍 磦仆仂亞仂 亰于仍仆亠仆仆 亠于 仗仂弍仆仂 亠舒仍亰于舒亳 仆亠亠亶
IDisposable, 磻亳亶 于亳亰仆舒舒 仆舒磦仆 仄亠仂亟 Dispose()  于仂
仗舒亟从仂仄于. 仂亳于舒 仂弍'从舒 仗仂于亳仆亠仆 于亳从仍亳从舒亳 亠亶 仄亠仂亟 仗亳
亰舒于亠亠仆仆 于亳从仂亳舒仆仆 仂弍'从舒.
Andrii Hladkyi
trilobt@gmail.com 7
Andrii Hladkyi
trilobt@gmail.com 8
亠仄仂仆舒
仍舒 System.GC
 仍舒, 仂 仗亠亟舒于仍 亰弍亳舒 仄, 仆舒亰亳于舒
System.GC. 亠仂亟亳 仂亞仂 从仍舒 于仗仍亳于舒ム 仆舒 亠,
从仂仍亳 于亳从仂仆 亰弍从舒 仄  从仂仍亳 于亳于仍仆ム
亠亳, 于亳亟仍亠仆 仂弍'从.
Andrii Hladkyi
trilobt@gmail.com 9
Andrii Hladkyi
trilobt@gmail.com 10
亠仄仂仆舒
仂仆 仗仂从仂仍仆 仗亳 亰弍亳舒仆仆 仄仂
 弍亳舒 仄 仗仍 仂亳亠仆仆 仗舒仄', 仂弍 仆亠 亟仂仗亳亳 舒亞仄亠仆舒,
束亳从舒損 , 仆亳仄亳 仍仂于舒仄亳, 于仆 束亰于舒損 于 仂弍'从亳 舒从, 仂弍 于仂仆亳
仂亰舒仂于于舒仍亳 仗仂仍亟仂于仆仂.
 亊从 仗仂从舒亰舒仍亳 亟仂仍亟亢亠仆仆, 于亠仍亳从舒 舒亳仆舒 仂弍'从于, 磻 于仂亠仆 仆亠亟舒于仆仂,
于亳亟从仂 舒ム 仆亠亟仂礀仆亳仄亳. 丐仂仄 从亠仂于舒仆舒 从仗舒 弍仍舒 仂亰亟仍亠仆舒 仆舒 3
仗仂从仂仍仆仆: 0, 1  2. 仂亰仄 仗舒仄' 仗亟 从仂亢仆亠 亰 仗仂从仂仍仆 亰仆亳亶 - 于仆
亰弍仍 亰 仂仂仄 仆仂仄亠舒 仗仂从仂仍仆仆.
  仆仂于仂于仂亠仆 仂弍'从亳 仗仂舒仗仍ム 于 仗亠亠 (0) 仗仂从仂仍仆仆. 弍 仄
舒于仂仄舒亳仆仂 于亳从仍亳从舒 仗仂 亰舒从仆亠仆仆 仗舒仄' 于 仂亟仆仂仄 亰 仗仂从仂仍仆
 弍'从亳, 磻 仗亠亠亢亳仍亳 亰弍 仄, 仗亠亠仂亟 于 仆舒仗仆亠 仗仂从仂仍仆仆.
 舒仆亳亶 仗亟亟 亟仂亰于仂仍 亟亢亠 于亳亟从仂 仂亳舒亳 仗舒仄': 亳仄 仄亠仆亠 仂亰仄
仗仂从仂仍仆仆, 亳仄 于亳亟亠 仗仂仂亟 仂仗亠舒 仗仂 亟亠舒亞仄亠仆舒 仗舒仄'.
Andrii Hladkyi
trilobt@gmail.com 11

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NET Framework and C# Module 12.2. Garbage Collector

  • 1. .NET Framework & C# Module 12.2 Garbage Collector
  • 2. 仂仄 仄仂亟仍: 亳于亳亶 亳从仍 仂弍从于 仂仆 亰弍亳舒舒 仄仂 亠从仂 仄亠仂亟 Finalize 亠仂亟 Dispose 仆亠亠亶 IDispose 仍舒 System.GC 仂仆 仗仂从仂仍仆 仗亳 亰弍亳舒仆仆 仄仂 2 Andrii Hladkyi trilobt@gmail.com
  • 3. 亳于亳亶 亳从仍 仂弍从于 亳于亳亶 亳从仍 弍亟 磻仂亞仂 仂弍'从舒 仄仂亢仆舒 仗仂亟舒亳 舒从: 于亳亟仍亠仆仆 仗舒仄' 亟仍 亳仗; 仆舒仍亰舒 于亳亟仍亠仆仂 仗舒仄' (舒仆仂于从舒 仂弍'从舒 于 仗仂舒从仂于亠 亰仆舒亠仆仆, 于亳从仍亳从 从仂仆从仂舒); 于亳从仂亳舒仆仆 仂弍'从舒 于 仗仂亞舒仄; 亶仆舒 舒仆 仂弍'从舒; 亰于仍仆亠仆仆 亰舒亶仆仂 仗舒仄'. 丕仗舒于仍仆仆 亢亳于亳仄 亳从仍仂仄 仂弍'从于 磦仍 仂弍仂 于舒亢从 亰舒亟舒 仗仂亶仆亳仄 亟亢亠亠仍仂仄 仗仂仄亳仍仂从. 丐仂仄 弍于 仂亰仂弍仍亠仆亳亶 舒于仂仄舒亳仆亳亶 仄亠舒仆亰仄 仗舒于仍仆仆 仗舒仄' 亰弍 仄. Andrii Hladkyi trilobt@gmail.com 3
  • 4. 仂仆 亰弍亳舒舒 仄仂 弍 仄 亰于仍仆 仗仂亞舒仄舒 于亟 仆亠仂弍亟仆仂 仗仂亶仆仂 亠亢亳亳 亰舒 于亳从仂亳舒仆仆礆 于仂舒仆亳仄 亰于仍仆亠仆仆礆 仗舒仄'. 弌仗亠舒仍仆亳亶 从仂亟, 磻亳亶 亰亟亶仆ム 亰弍 仄 仆舒亰亳于舒 束亰弍亳舒 仄晛 (Garbage Collector). 弍亳舒 仄 于亟亠亢 亰仆亳 仂弍'从亳, 仂 亰仆舒仂亟 于 从亠仂于舒仆仂 仗舒仄'. 弍亳舒仆仆 仄 舒于仂仄舒亳仆仂 亰舒仗从舒 于 舒亰, 磻仂 仆亠仂弍亟仆亳亶 仂弍磪 仗舒仄' 弍仍亠 亟仂仗仆仂亞仂 仂弍磪 于仍仆仂 仗舒仄'. 仄 仂亞仂, 仗仂亞舒仄舒 仄仂亢亠 仗亳仄仂于仂 亰舒仗亳亳 亰弍从 仄 亰舒 亟仂仗仂仄仂亞仂 仄亠仂亟 Collect 从仍舒 System.GC. 弍亳舒仆仆 仄 从仍舒亟舒 亰 舒从亳 从仂从于: 弍亳舒 仄 亰亟亶仆ム 仗仂从 从亠仂于舒仆亳 仂弍'从于, 仆舒 磻 仗仂亳仍舒仆仆 于 从亠仂于舒仆仂仄 从仂亟. 弍亳舒 仄 仆舒仄舒亞舒 亰舒于亠亳亳 仂弍'从亳, 仆舒 磻 仆亠仄舒 仗仂亳仍舒仆. 弍亳舒 仄 亰于仍仆 仂弍'从亳, 仆舒 磻 仆亠仄舒 仗仂亳仍舒仆, 于亳于仍仆 于亳亟仍亠仆 仄 仗舒仄'. Andrii Hladkyi trilobt@gmail.com 4
  • 5. 亠从仂 仄亠仂亟 Finalize 弍亳舒 仄 于仄 舒于仂仄舒亳仆仂 亶仆于舒亳 仗仂 仂弍'从亳 (舒从, 磻 String, Delegate 仆.) 亰于仍仆亳 亰舒亶仄舒仆 仆亳仄亳 仗舒仄'. 乂仂 亢 仂 从仍舒亟仆亳 亳仗于, 仂 亰弍亳舒 仄 仗舒于亳仍仆仂 亶仆于舒亳 仆亠 于仄, 仂仄 仆亠仂弍亟仆仂 仗亳舒亳 仗亠舒仍仆亳亶 亠从亰亠仄仗仍仆亳亶 从仂亟 亟仍 仗舒于亳仍仆仂亞仂 亰仆亳亠仆仆 仂弍'从舒. 仍 舒从亳 亳仗于 C# 仗亟亳仄 仗亠舒仍仆亳亶 仄亠舒仆亰仄, 亰于舒仆亳亶 仆舒仍亰舒 仂弍'从于 (finalization). 仍 于亳从仂仆舒仆仆 仂亞仂 仄亠舒仆亰仄 仂弍'从 仗仂于亳仆亠仆 亠舒仍亰于舒亳 仂亟仆仂亶仄亠仆仆亳亶 仄亠仂亟 (Finalize), 磻亳亶 弍亟亠 于亳从仍亳从舒仆亳亶 亰弍亳舒亠仄 仄 弍亠亰仗仂亠亠亟仆仂 仗亠亠亟 亶仂亞仂 亰仆亳亠仆仆礆. C# 亟仍 于亳亰仆舒亠仆仆 亰舒于亠于舒舒 于亳从仂亳仂于 亳仍亟舒 (~) 仄' 从仍舒. 亠亠于舒仆舒亢于舒亳 仆舒仍亰舒仂 于亳从仂亳仂于于舒亳 于 仆仂仄 仗舒舒仄亠亳 仆亠 仄仂亢仆舒. Andrii Hladkyi trilobt@gmail.com 5
  • 7. 亠仂亟 Dispose 仆亠亠亶 IDispose 亠仂亟 Finalize () 弍亠亰仗仂亠亠亟仆仂 于亳从仍亳从舒亳 仆亠 仄仂亢仆舒 - 亶仂亞仂 于亳从仍亳从舒 Garbage Collector 仗亳 亶仆于舒仆仆 仂弍'从舒 仗亟 舒 亰弍从亳 仄. 仍 磦仆仂亞仂 亰于仍仆亠仆仆 亠于 仗仂弍仆仂 亠舒仍亰于舒亳 仆亠亠亶 IDisposable, 磻亳亶 于亳亰仆舒舒 仆舒磦仆 仄亠仂亟 Dispose() 于仂 仗舒亟从仂仄于. 仂亳于舒 仂弍'从舒 仗仂于亳仆亠仆 于亳从仍亳从舒亳 亠亶 仄亠仂亟 仗亳 亰舒于亠亠仆仆 于亳从仂亳舒仆仆 仂弍'从舒. Andrii Hladkyi trilobt@gmail.com 7
  • 9. 仍舒 System.GC 仍舒, 仂 仗亠亟舒于仍 亰弍亳舒 仄, 仆舒亰亳于舒 System.GC. 亠仂亟亳 仂亞仂 从仍舒 于仗仍亳于舒ム 仆舒 亠, 从仂仍亳 于亳从仂仆 亰弍从舒 仄 从仂仍亳 于亳于仍仆ム 亠亳, 于亳亟仍亠仆 仂弍'从. Andrii Hladkyi trilobt@gmail.com 9
  • 11. 仂仆 仗仂从仂仍仆 仗亳 亰弍亳舒仆仆 仄仂 弍亳舒 仄 仗仍 仂亳亠仆仆 仗舒仄', 仂弍 仆亠 亟仂仗亳亳 舒亞仄亠仆舒, 束亳从舒損 , 仆亳仄亳 仍仂于舒仄亳, 于仆 束亰于舒損 于 仂弍'从亳 舒从, 仂弍 于仂仆亳 仂亰舒仂于于舒仍亳 仗仂仍亟仂于仆仂. 亊从 仗仂从舒亰舒仍亳 亟仂仍亟亢亠仆仆, 于亠仍亳从舒 舒亳仆舒 仂弍'从于, 磻 于仂亠仆 仆亠亟舒于仆仂, 于亳亟从仂 舒ム 仆亠亟仂礀仆亳仄亳. 丐仂仄 从亠仂于舒仆舒 从仗舒 弍仍舒 仂亰亟仍亠仆舒 仆舒 3 仗仂从仂仍仆仆: 0, 1 2. 仂亰仄 仗舒仄' 仗亟 从仂亢仆亠 亰 仗仂从仂仍仆 亰仆亳亶 - 于仆 亰弍仍 亰 仂仂仄 仆仂仄亠舒 仗仂从仂仍仆仆. 仆仂于仂于仂亠仆 仂弍'从亳 仗仂舒仗仍ム 于 仗亠亠 (0) 仗仂从仂仍仆仆. 弍 仄 舒于仂仄舒亳仆仂 于亳从仍亳从舒 仗仂 亰舒从仆亠仆仆 仗舒仄' 于 仂亟仆仂仄 亰 仗仂从仂仍仆 弍'从亳, 磻 仗亠亠亢亳仍亳 亰弍 仄, 仗亠亠仂亟 于 仆舒仗仆亠 仗仂从仂仍仆仆. 舒仆亳亶 仗亟亟 亟仂亰于仂仍 亟亢亠 于亳亟从仂 仂亳舒亳 仗舒仄': 亳仄 仄亠仆亠 仂亰仄 仗仂从仂仍仆仆, 亳仄 于亳亟亠 仗仂仂亟 仂仗亠舒 仗仂 亟亠舒亞仄亠仆舒 仗舒仄'. Andrii Hladkyi trilobt@gmail.com 11