Remedy stuck finalizes without calling GC manually

-1

We have a certain set of actions in our C# application which causes the RAM to continue to grow until the form closes. This form is long lived and some users will not close this form for the entire day.

Basically, Form frmRelationalSearch calls Form frmCombinedSearch to search a person on, and Form frmCombinedSearch will return the person back to Form frmRelationalSearch when Form frmCombinedSearch closes. Form frmRelationalSearch is the long lived form here, while Form frmCombinedSearch seems to be the one causing problems.

For testing purposes, I've manually added in GC.Collect() and GC.WaitForPendingFinalizers() on each person search cycle to see if it is truly a memory leak. I've realized that the form frmCombinedSearch does indeed get collected by the GC and probably is only living long because of it being in the finalizer queue. What I don't get is how to remedy the problem of the growing RAM usage without manually calling GC.Collect() and GC.WaitForPendingFinalizers() in our code wince this is a bad practice.

I've confirmed this using dotMemory and ANTS memory profilers.

How should I handle this? Is it acceptable to call the GC manually in this case?

This is the code right now:

private void btnSearch_Click(object sender, EventArgs e)

{

    // Without these three lines, the RAM will continue to grow until

    // this form (frmRelationalSearch) is closed.



    // GC.Collect();

    // GC.WaitForPendingFinalizers();

    // GC.Collect();



    frmCombinedSearch frm = new frmCombinedSearch();

    try

    {

        // Custom code which just shows the form in the current tab

        frm.ShowInTab(this.ParentTabPage);

    }

    catch (Exception ex)

    {

        this.ShowException(ex);

    }

}

In both analyzers, frmCombinedSearch gets retained because of the finalizer queue.

EDIT:
ShowInTab() is non-blocking so I can't use a using statement to dispose of it because it would just be disposed right after it's created.

c# winforms memory-leaks garbage-collection

share|improve this question

edited Jan 3 at 14:21

Jimenemex

asked Jan 3 at 1:10

JimenemexJimenemex

2,1071525

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Are you disposing frmCombinedSearch ?
  
  – Michael Randall
  Jan 3 at 1:24
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can't you move the frmCombinedSearch Form logic into a UserControl? Since you apparently want to show that Form inside a TabControl (is it?). So you just need to create the UC once and you can manage and dispose of its resources directly. Btw, you're not showing how/when you're disposing of the frm object(s).
  
  – Jimi
  Jan 3 at 1:26
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  frmCombineSearch has Dispose called on the forms close event from the designer file. I can't use a using statement because if I do, then I will dispose of the form entirely when it's still visible in the TabControl. I would just be opening it and closing it right after.
  
  – Jimenemex
  Jan 3 at 1:31
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes, you can and no you cannot call dispose() inside the Form class. The class disposes of the resources it initializes, not of itself. You need to dispose of the frm object you create in the caller class (frmRelationalSearch).
  
  – Jimi
  Jan 3 at 1:36
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  frmRelationalSearch is Disposed when it's closed because it's shown with form.Show() inside the ShowInTab() method. After a search is done, then it will close.
  
  – Jimenemex
  Jan 3 at 1:48
  
  
  

  
  
  
  

add a comment | 

-1

We have a certain set of actions in our C# application which causes the RAM to continue to grow until the form closes. This form is long lived and some users will not close this form for the entire day.

Basically, Form frmRelationalSearch calls Form frmCombinedSearch to search a person on, and Form frmCombinedSearch will return the person back to Form frmRelationalSearch when Form frmCombinedSearch closes. Form frmRelationalSearch is the long lived form here, while Form frmCombinedSearch seems to be the one causing problems.

For testing purposes, I've manually added in GC.Collect() and GC.WaitForPendingFinalizers() on each person search cycle to see if it is truly a memory leak. I've realized that the form frmCombinedSearch does indeed get collected by the GC and probably is only living long because of it being in the finalizer queue. What I don't get is how to remedy the problem of the growing RAM usage without manually calling GC.Collect() and GC.WaitForPendingFinalizers() in our code wince this is a bad practice.

I've confirmed this using dotMemory and ANTS memory profilers.

How should I handle this? Is it acceptable to call the GC manually in this case?

This is the code right now:

private void btnSearch_Click(object sender, EventArgs e)

{

    // Without these three lines, the RAM will continue to grow until

    // this form (frmRelationalSearch) is closed.



    // GC.Collect();

    // GC.WaitForPendingFinalizers();

    // GC.Collect();



    frmCombinedSearch frm = new frmCombinedSearch();

    try

    {

        // Custom code which just shows the form in the current tab

        frm.ShowInTab(this.ParentTabPage);

    }

    catch (Exception ex)

    {

        this.ShowException(ex);

    }

}

In both analyzers, frmCombinedSearch gets retained because of the finalizer queue.

EDIT:
ShowInTab() is non-blocking so I can't use a using statement to dispose of it because it would just be disposed right after it's created.

c# winforms memory-leaks garbage-collection

share|improve this question

edited Jan 3 at 14:21

Jimenemex

asked Jan 3 at 1:10

JimenemexJimenemex

2,1071525

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Are you disposing frmCombinedSearch ?
  
  – Michael Randall
  Jan 3 at 1:24
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can't you move the frmCombinedSearch Form logic into a UserControl? Since you apparently want to show that Form inside a TabControl (is it?). So you just need to create the UC once and you can manage and dispose of its resources directly. Btw, you're not showing how/when you're disposing of the frm object(s).
  
  – Jimi
  Jan 3 at 1:26
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  frmCombineSearch has Dispose called on the forms close event from the designer file. I can't use a using statement because if I do, then I will dispose of the form entirely when it's still visible in the TabControl. I would just be opening it and closing it right after.
  
  – Jimenemex
  Jan 3 at 1:31
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes, you can and no you cannot call dispose() inside the Form class. The class disposes of the resources it initializes, not of itself. You need to dispose of the frm object you create in the caller class (frmRelationalSearch).
  
  – Jimi
  Jan 3 at 1:36
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  frmRelationalSearch is Disposed when it's closed because it's shown with form.Show() inside the ShowInTab() method. After a search is done, then it will close.
  
  – Jimenemex
  Jan 3 at 1:48
  
  
  

  
  
  
  

add a comment | 

-1

-1

-1

We have a certain set of actions in our C# application which causes the RAM to continue to grow until the form closes. This form is long lived and some users will not close this form for the entire day.

Basically, Form frmRelationalSearch calls Form frmCombinedSearch to search a person on, and Form frmCombinedSearch will return the person back to Form frmRelationalSearch when Form frmCombinedSearch closes. Form frmRelationalSearch is the long lived form here, while Form frmCombinedSearch seems to be the one causing problems.

For testing purposes, I've manually added in GC.Collect() and GC.WaitForPendingFinalizers() on each person search cycle to see if it is truly a memory leak. I've realized that the form frmCombinedSearch does indeed get collected by the GC and probably is only living long because of it being in the finalizer queue. What I don't get is how to remedy the problem of the growing RAM usage without manually calling GC.Collect() and GC.WaitForPendingFinalizers() in our code wince this is a bad practice.

I've confirmed this using dotMemory and ANTS memory profilers.

How should I handle this? Is it acceptable to call the GC manually in this case?

This is the code right now:

private void btnSearch_Click(object sender, EventArgs e)

{

    // Without these three lines, the RAM will continue to grow until

    // this form (frmRelationalSearch) is closed.



    // GC.Collect();

    // GC.WaitForPendingFinalizers();

    // GC.Collect();



    frmCombinedSearch frm = new frmCombinedSearch();

    try

    {

        // Custom code which just shows the form in the current tab

        frm.ShowInTab(this.ParentTabPage);

    }

    catch (Exception ex)

    {

        this.ShowException(ex);

    }

}

In both analyzers, frmCombinedSearch gets retained because of the finalizer queue.

EDIT:
ShowInTab() is non-blocking so I can't use a using statement to dispose of it because it would just be disposed right after it's created.

c# winforms memory-leaks garbage-collection

share|improve this question

edited Jan 3 at 14:21

Jimenemex

asked Jan 3 at 1:10

JimenemexJimenemex

2,1071525

We have a certain set of actions in our C# application which causes the RAM to continue to grow until the form closes. This form is long lived and some users will not close this form for the entire day.

Basically, Form frmRelationalSearch calls Form frmCombinedSearch to search a person on, and Form frmCombinedSearch will return the person back to Form frmRelationalSearch when Form frmCombinedSearch closes. Form frmRelationalSearch is the long lived form here, while Form frmCombinedSearch seems to be the one causing problems.

For testing purposes, I've manually added in GC.Collect() and GC.WaitForPendingFinalizers() on each person search cycle to see if it is truly a memory leak. I've realized that the form frmCombinedSearch does indeed get collected by the GC and probably is only living long because of it being in the finalizer queue. What I don't get is how to remedy the problem of the growing RAM usage without manually calling GC.Collect() and GC.WaitForPendingFinalizers() in our code wince this is a bad practice.

I've confirmed this using dotMemory and ANTS memory profilers.

How should I handle this? Is it acceptable to call the GC manually in this case?

This is the code right now:

private void btnSearch_Click(object sender, EventArgs e)

{

    // Without these three lines, the RAM will continue to grow until

    // this form (frmRelationalSearch) is closed.



    // GC.Collect();

    // GC.WaitForPendingFinalizers();

    // GC.Collect();



    frmCombinedSearch frm = new frmCombinedSearch();

    try

    {

        // Custom code which just shows the form in the current tab

        frm.ShowInTab(this.ParentTabPage);

    }

    catch (Exception ex)

    {

        this.ShowException(ex);

    }

}

In both analyzers, frmCombinedSearch gets retained because of the finalizer queue.

EDIT:
ShowInTab() is non-blocking so I can't use a using statement to dispose of it because it would just be disposed right after it's created.

c# winforms memory-leaks garbage-collection

c# winforms memory-leaks garbage-collection

share|improve this question

edited Jan 3 at 14:21

Jimenemex

asked Jan 3 at 1:10

JimenemexJimenemex

2,1071525

share|improve this question

edited Jan 3 at 14:21

Jimenemex

asked Jan 3 at 1:10

JimenemexJimenemex

2,1071525

share|improve this question

share|improve this question

edited Jan 3 at 14:21

Jimenemex

edited Jan 3 at 14:21

Jimenemex

edited Jan 3 at 14:21

Jimenemex

asked Jan 3 at 1:10

JimenemexJimenemex

2,1071525

asked Jan 3 at 1:10

JimenemexJimenemex

2,1071525

asked Jan 3 at 1:10

JimenemexJimenemex

2,1071525

2,1071525

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Are you disposing frmCombinedSearch ?
  
  – Michael Randall
  Jan 3 at 1:24
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can't you move the frmCombinedSearch Form logic into a UserControl? Since you apparently want to show that Form inside a TabControl (is it?). So you just need to create the UC once and you can manage and dispose of its resources directly. Btw, you're not showing how/when you're disposing of the frm object(s).
  
  – Jimi
  Jan 3 at 1:26
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  frmCombineSearch has Dispose called on the forms close event from the designer file. I can't use a using statement because if I do, then I will dispose of the form entirely when it's still visible in the TabControl. I would just be opening it and closing it right after.
  
  – Jimenemex
  Jan 3 at 1:31
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes, you can and no you cannot call dispose() inside the Form class. The class disposes of the resources it initializes, not of itself. You need to dispose of the frm object you create in the caller class (frmRelationalSearch).
  
  – Jimi
  Jan 3 at 1:36
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  frmRelationalSearch is Disposed when it's closed because it's shown with form.Show() inside the ShowInTab() method. After a search is done, then it will close.
  
  – Jimenemex
  Jan 3 at 1:48
  
  
  

  
  
  
  

add a comment | 

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Are you disposing frmCombinedSearch ?
  
  – Michael Randall
  Jan 3 at 1:24
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can't you move the frmCombinedSearch Form logic into a UserControl? Since you apparently want to show that Form inside a TabControl (is it?). So you just need to create the UC once and you can manage and dispose of its resources directly. Btw, you're not showing how/when you're disposing of the frm object(s).
  
  – Jimi
  Jan 3 at 1:26
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  frmCombineSearch has Dispose called on the forms close event from the designer file. I can't use a using statement because if I do, then I will dispose of the form entirely when it's still visible in the TabControl. I would just be opening it and closing it right after.
  
  – Jimenemex
  Jan 3 at 1:31
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes, you can and no you cannot call dispose() inside the Form class. The class disposes of the resources it initializes, not of itself. You need to dispose of the frm object you create in the caller class (frmRelationalSearch).
  
  – Jimi
  Jan 3 at 1:36
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  frmRelationalSearch is Disposed when it's closed because it's shown with form.Show() inside the ShowInTab() method. After a search is done, then it will close.
  
  – Jimenemex
  Jan 3 at 1:48
  
  
  

  
  
  
  

Are you disposing frmCombinedSearch ?

– Michael Randall
Jan 3 at 1:24

Are you disposing frmCombinedSearch ?

– Michael Randall
Jan 3 at 1:24

Can't you move the frmCombinedSearch Form logic into a UserControl? Since you apparently want to show that Form inside a TabControl (is it?). So you just need to create the UC once and you can manage and dispose of its resources directly. Btw, you're not showing how/when you're disposing of the frm object(s).

– Jimi
Jan 3 at 1:26

Can't you move the frmCombinedSearch Form logic into a UserControl? Since you apparently want to show that Form inside a TabControl (is it?). So you just need to create the UC once and you can manage and dispose of its resources directly. Btw, you're not showing how/when you're disposing of the frm object(s).

– Jimi
Jan 3 at 1:26

frmCombineSearch has Dispose called on the forms close event from the designer file. I can't use a using statement because if I do, then I will dispose of the form entirely when it's still visible in the TabControl. I would just be opening it and closing it right after.

– Jimenemex
Jan 3 at 1:31

frmCombineSearch has Dispose called on the forms close event from the designer file. I can't use a using statement because if I do, then I will dispose of the form entirely when it's still visible in the TabControl. I would just be opening it and closing it right after.

– Jimenemex
Jan 3 at 1:31

Yes, you can and no you cannot call dispose() inside the Form class. The class disposes of the resources it initializes, not of itself. You need to dispose of the frm object you create in the caller class (frmRelationalSearch).

– Jimi
Jan 3 at 1:36

Yes, you can and no you cannot call dispose() inside the Form class. The class disposes of the resources it initializes, not of itself. You need to dispose of the frm object you create in the caller class (frmRelationalSearch).

– Jimi
Jan 3 at 1:36

frmRelationalSearch is Disposed when it's closed because it's shown with form.Show() inside the ShowInTab() method. After a search is done, then it will close.

– Jimenemex
Jan 3 at 1:48

frmRelationalSearch is Disposed when it's closed because it's shown with form.Show() inside the ShowInTab() method. After a search is done, then it will close.

– Jimenemex
Jan 3 at 1:48

add a comment | 

2 Answers
2

active

oldest

votes

0

WinForms need to be closed or disposed (link). I recommend using using.

private void btnSearch_Click(object sender, EventArgs e)

{

    using (frmCombinedSearch frm = new frmCombinedSearch())

    {

        try

        {

            // Custom code which just shows the form in the current tab

            frm.ShowInTab(this.ParentTabPage);

        }

        catch (Exception ex)

        {

            this.ShowException(ex);

        }

    }

}

share|improve this answer

answered Jan 3 at 1:28

John WuJohn Wu

31.4k42754

add a comment | 

0

Are frmCombinedSearch and frmRelationalSearch disposable? If it is you can implement a using so it is collected once closed.

something like below:

using(frmCombinedSearch frm = new frmCombinedSearch()){

    try {

       frm.ShowInTab(this.ParentTabPage); }

    catch(Exception ex) {

       this.ShowException(ex); } }

share|improve this answer

answered Jan 3 at 1:30

SlipochSlipoch

417313

add a comment | 

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

active

oldest

votes

active

oldest

votes

0

WinForms need to be closed or disposed (link). I recommend using using.

private void btnSearch_Click(object sender, EventArgs e)

{

    using (frmCombinedSearch frm = new frmCombinedSearch())

    {

        try

        {

            // Custom code which just shows the form in the current tab

            frm.ShowInTab(this.ParentTabPage);

        }

        catch (Exception ex)

        {

            this.ShowException(ex);

        }

    }

}

share|improve this answer

answered Jan 3 at 1:28

John WuJohn Wu

31.4k42754

add a comment | 

0

WinForms need to be closed or disposed (link). I recommend using using.

private void btnSearch_Click(object sender, EventArgs e)

{

    using (frmCombinedSearch frm = new frmCombinedSearch())

    {

        try

        {

            // Custom code which just shows the form in the current tab

            frm.ShowInTab(this.ParentTabPage);

        }

        catch (Exception ex)

        {

            this.ShowException(ex);

        }

    }

}

share|improve this answer

answered Jan 3 at 1:28

John WuJohn Wu

31.4k42754

add a comment | 

0

0

0

WinForms need to be closed or disposed (link). I recommend using using.

private void btnSearch_Click(object sender, EventArgs e)

{

    using (frmCombinedSearch frm = new frmCombinedSearch())

    {

        try

        {

            // Custom code which just shows the form in the current tab

            frm.ShowInTab(this.ParentTabPage);

        }

        catch (Exception ex)

        {

            this.ShowException(ex);

        }

    }

}

share|improve this answer

answered Jan 3 at 1:28

John WuJohn Wu

31.4k42754

WinForms need to be closed or disposed (link). I recommend using using.

private void btnSearch_Click(object sender, EventArgs e)

{

    using (frmCombinedSearch frm = new frmCombinedSearch())

    {

        try

        {

            // Custom code which just shows the form in the current tab

            frm.ShowInTab(this.ParentTabPage);

        }

        catch (Exception ex)

        {

            this.ShowException(ex);

        }

    }

}

share|improve this answer

answered Jan 3 at 1:28

John WuJohn Wu

31.4k42754

share|improve this answer

share|improve this answer

answered Jan 3 at 1:28

John WuJohn Wu

31.4k42754

answered Jan 3 at 1:28

John WuJohn Wu

31.4k42754

answered Jan 3 at 1:28

John WuJohn Wu

31.4k42754

31.4k42754

add a comment | 

add a comment | 

0

Are frmCombinedSearch and frmRelationalSearch disposable? If it is you can implement a using so it is collected once closed.

something like below:

using(frmCombinedSearch frm = new frmCombinedSearch()){

    try {

       frm.ShowInTab(this.ParentTabPage); }

    catch(Exception ex) {

       this.ShowException(ex); } }

share|improve this answer

answered Jan 3 at 1:30

SlipochSlipoch

417313

add a comment | 

0

Are frmCombinedSearch and frmRelationalSearch disposable? If it is you can implement a using so it is collected once closed.

something like below:

using(frmCombinedSearch frm = new frmCombinedSearch()){

    try {

       frm.ShowInTab(this.ParentTabPage); }

    catch(Exception ex) {

       this.ShowException(ex); } }

share|improve this answer

answered Jan 3 at 1:30

SlipochSlipoch

417313

add a comment | 

0

0

0

Are frmCombinedSearch and frmRelationalSearch disposable? If it is you can implement a using so it is collected once closed.

something like below:

using(frmCombinedSearch frm = new frmCombinedSearch()){

    try {

       frm.ShowInTab(this.ParentTabPage); }

    catch(Exception ex) {

       this.ShowException(ex); } }

share|improve this answer

answered Jan 3 at 1:30

SlipochSlipoch

417313

Are frmCombinedSearch and frmRelationalSearch disposable? If it is you can implement a using so it is collected once closed.

something like below:

using(frmCombinedSearch frm = new frmCombinedSearch()){

    try {

       frm.ShowInTab(this.ParentTabPage); }

    catch(Exception ex) {

       this.ShowException(ex); } }

share|improve this answer

answered Jan 3 at 1:30

SlipochSlipoch

417313

share|improve this answer

share|improve this answer

answered Jan 3 at 1:30

SlipochSlipoch

417313

answered Jan 3 at 1:30

SlipochSlipoch

417313

answered Jan 3 at 1:30

SlipochSlipoch

417313

417313

add a comment | 

add a comment | 

Thanks for contributing an answer to Stack Overflow!

• Please be sure to answer the question. Provide details and share your research!

But avoid …

• Asking for help, clarification, or responding to other answers.


• Making statements based on opinion; back them up with references or personal experience.

To learn more, see our tips on writing great answers.

draft saved

draft discarded

Thanks for contributing an answer to Stack Overflow!

• Please be sure to answer the question. Provide details and share your research!

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