Erratic Masterpage exception

  • Thread starter Thread starter SandpointGuy
  • Start date Start date
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SandpointGuy

I have a masterpage named MasterpageController with a menu. In the
codebehind I have a method SetMasterMenu(<some parms>) to display the
appropriate menu items.
The content page, which has a MasterType directive, executes the method
using "this.Master.SetMasterMenu(<some parms>)". Runs fine for maybe 5-10
"start with/without debugging"'s, while I am in development mode in vs.net
2005, and then I'll start getting an "Unable to cast object of type
'ASP.masterpagecontroller_master' to type 'ASP.masterpagecontroller_master'"
when the content page attempts to execute the method. I have to restart IIS
to get the app to run correctly .. then a few starts later I get the
exception.
Any ideas on how to fix this?
 
SandpointGuy,
I have a masterpage named MasterpageController with a menu. In the
codebehind I have a method SetMasterMenu(<some parms>) to display the
appropriate menu items.
The content page, which has a MasterType directive, executes the method
using "this.Master.SetMasterMenu(<some parms>)". Runs fine for maybe 5-10
"start with/without debugging"'s, while I am in development mode in vs.net
2005, and then I'll start getting an "Unable to cast object of type
'ASP.masterpagecontroller_master' to type
'ASP.masterpagecontroller_master'"
when the content page attempts to execute the method. I have to restart
IIS
to get the app to run correctly .. then a few starts later I get the
exception.
Any ideas on how to fix this?Sounds like you might want to upgrade to
VS2008.
Click to expand...

I've never seen this error but looks like you're not the only one.

See http://forums.asp.net/p/954194/1184928.aspx.

Then, on page 2, Microsoft replies with:

"This particular exception error can happen a number of ways (most typically
due to developer error), which is why it took awhile to figure out what was
happening and identify the bug.

As Ryan mentioned above, we are releasing a QFE hotfix that will be
available in a few weeks (QFE reference #4039). It is in testing right now
and we'll release it once we have confirmation from a number of customers
who have reported it that it fixes the issue.

As a temporary workaround, you can also disable batch compilation when
deploying your production apps. This can be done by setting the
<compilation batch="false"> attribute in web.config. This will avoid the
problem occuring in a production environment.

Note that you want to be careful using the above switch at development
time -- since it will slow does VS compiles quite a bit. But if you want to
be safe when you deploy files you can enable it until the QFE comes out."

This was posted in February of 2006.
 
Thanks.
I had been running this code for months without the problem.
I have been working on an .ascx control to do file uploads from. I dragged
it onto a page and this started happening. The page I dragged it onto isnt
executed when this problem happens. But if I were asked what was different
since yesterday, I would point to this.
 
I would bet on caching to be a problem..
LoadControl (which might be used with master pages inexplicitly) function
will return not a reference to an object but reference to
PartialCachingControl which might be not your object you trying to cast
to...

So try to investigate into that direction...

George
 
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