How to force garbage collector to run

Question

Interviewer asked me about this today    is there an answer

User · Accepted Answer

System GC Collect   forces garbage collector to run  This is not recommended but can be used if situations arise

User · Answer

You do not want to force the garbage collector to run   However  if you ever did  as a purely academic exercise  of course    GC Collect

User · Answer

GC Collect

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GC Collect     Keep in mind  though  that the Garbage Collector might not always clean up what you expect

User · Answer

I think that  Net Framework does this automatically but just in case  First  make sure to select what you want to erase  and then call the garbage collector   randomClass object1   new randomClass            Give a null value to the code you want to delete object1   null     Then call the garbage collector to erase what you gave the null value GC Collect      I think that s it   Hope I help someone

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Since I m too low reputation to comment  I will post this as an answer since it saved me after hours of struggeling and it may help somebody else  As most people state GC Collect    is NOT recommended to do this normally  except in edge cases  As an example of this running garbage collection was exactly the solution to my scenario  My program runs a long running operation on a file in a thread and afterwards deletes the file from the main thread  However  when the file operation throws an exception  NET does NOT release the filelock until the garbage is actually collected  EVEN when the long running task is encapsulated in a using statement  Therefore the program has to force garbage collection before attempting to delete the file  In code          var returnvalue   0          using  var t   Task Run      gt  TheTask args  returnvalue                            TheTask   opens a file and then throws an exception  The exception itself is handled within the task so it does return a result  the errorcode              returnvalue   t Result                      Even though at this point the Thread is closed the file is not released untill garbage is collected         System GC Collect            DeleteLockedFile

User · Answer

GC Collect      from MDSN      Use this method to try to reclaim all   memory that is inaccessible       All objects  regardless of how long   they have been in memory  are   considered for collection  however    objects that are referenced in managed   code are not collected  Use this   method to force the system to try to   reclaim the maximum amount of   available memory

User · Answer

It is not recommended to call gc explicitly  but if you call   GC Collect    GC WaitForPendingFinalizers      It will call GC explicitly throughout your code  don t forget to call GC WaitForPendingFinalizers    after GC Collect

[c#] How to force garbage collector to run?

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