Asp Forum - Re: Memory usage when hosting a WPF control in a WinForms application

Piekop

3/30/2011 8:04:00 AM

Hello Anthony,

I'm currently having the same problem of the array of bytes resting in the memory after disposing the ElementHost.
I tried to manipulate the dispose, but no success.
Did you ever find a way to solve this problem?

Kind regards
Piekop

> On Tuesday, March 18, 2008 10:45 AM ant7 wrote:

> Hi,
>
> We are using the ElementHost control to host a WPF control (which is mainly
> a subclassed WPF RichTextBox control) within our WinForms application. The
> WinForms application has a tab-based interface, so the user quite often has a
> number of these ElementHost controls open at once, and opens and closes them
> frequently.
>
> The problem we are seeing is that the application is using a large amount of
> memory, and it appears to be the ElementHost control causing the problem.
> When running CLR Profiler, we can see that a large amount (ie tens of
> megabytes) of Byte[] data is generated by the ElementHost.
>
> Is this a known issue? Users are eventually receiving OutOfMemoryException
> exceptions in production after extended use.
>
>
> Thanks,
>
> Anthony.

>> On Wednesday, March 19, 2008 3:41 AM v-lli wrote:

>> Hi Anthony,
>>
>> I have searched in our internal database and found a similar issue in it.
>>
>> The issue recorded in our database describes that over 20MB of memory is
>> used when resizing a form with a docked ElementHost.
>>
>> The root cause of this issue is that as the ElementHost is resized, a
>> BitmapSource is recreated to change the size of the ElementHost and this
>> will use up a lot of space on the managed heap until GC. Also, Winforms
>> hosting WPF will have a larger foot print than just a Winforms application
>> because the WPF libraries will need to be loaded as well, in addition to
>> the overhead of interop-ing between the two.
>>
>> It points out that this behavior is by design.
>>
>> often has a number of these ElementHost controls open at once, and opens
>> and closes them frequently.
>>
>> Do you mean that the ElementHost is contained in a TabControl on the form?
>> If so, I suggest that you don't use TabControl on the form because it will
>> use up a lot of memory especially when there're a lot of controls within
>> the tab pags of it.
>>
>> You can add several Panel controls instead and add the ElementHost on one
>> of the Panel controls. To mimic the behavior of a TabControl, switch among
>> the Panel controls by making only one of the Panel controls visible at one
>> time.
>>
>> Hope this helps.
>> If you have any question, please feel free to let me know.
>>
>> Sincerely,
>> Linda Liu
>> Microsoft Online Community Support
>>
>> Delighting our customers is our #1 priority. We welcome your comments and
>> suggestions about how we can improve the support we provide to you. Please
>> feel free to let my manager know what you think of the level of service
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>> msdnmg@microsoft.com.
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>>> On Wednesday, March 19, 2008 5:16 AM ant7 wrote:

>>> Hi Linda,
>>>
>>> Thanks for looking into this for me. Unfortunately we must keep a separate
>>> ElementHost for every open tab in our application. This is because each
>>> ElementHost has a RichTextBox in it which must maintain its own undo/redo
>>> history. It would be a pretty ordinary user experience if you lost your undo
>>> just because you changed tabs.
>>>
>>> I'm guessing there is no way that we can prevent the BitmapSource from being
>>> created? eg, turning off double buffering?
>>>
>>> Many thanks,
>>>
>>>
>>> Anthony.
>>>
>>> "Linda Liu[MSFT]" wrote:

>>>> On Friday, March 21, 2008 3:28 AM v-lli wrote:

>>>> Hi Anthony,
>>>>
>>>> Thank you for your prompt reply!
>>>>
>>>> The resolution of the similar issue recorded in our internal database is
>>>> just waiting for the garbage collector to collect the no longer needed
>>>> BitmapSources.
>>>>
>>>> Disabling double buffering can decrease memory usage in a sense, but it
>>>> won't prevent the BitmapSource from being created.
>>>>
>>>> To make garbage collector work more efficiently, I suggest that you dispose
>>>> objects by calling the Dispose method if they have as soon as you won't use
>>>> them any more and then set the objects to null or Nothing.
>>>>
>>>> Hope this helps.
>>>> If you have any question, please feel free to let me know.
>>>>
>>>> Sincerely,
>>>> Linda Liu
>>>> Microsoft Online Community Support
>>>>
>>>> Delighting our customers is our #1 priority. We welcome your comments and
>>>> suggestions about how we can improve the support we provide to you. Please
>>>> feel free to let my manager know what you think of the level of service
>>>> provided. You can send feedback directly to my manager at:
>>>> msdnmg@microsoft.com.
>>>>
>>>> This posting is provided "AS IS" with no warranties, and confers no rights.

microsoft.public.dotnet.framework

Re: Memory usage when hosting a WPF control in a WinForms application

Piekop

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