CheckIfInstallable method locks the file

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Stefano - 05 Jul 2006 00:08 GMT

Hi all,
when I try to use the CheckIfInstallable method of
System.Configuration.Install.AssemblyInstaller on a file not installable, I
correctly get an exception, but then the file checked remains locked by the
application until I close the program (e.g. I can't delete the file or
overwrite it).

Why the file remains locked? Is there a way to avoid it?

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Greg Young - 05 Jul 2006 00:21 GMT

It is because Assembly.Load is run on the file (the assembly gets loaded
into your appdomain).

You can see this in the Path setter it uses

set
{
if (value == null)
{
this.assembly = null;
}
this.assembly = Assembly.LoadFrom(value);
}

This will hold a lock on the file until the appdomain is killed.

No way to work around this I'm afraid except to wait until the appdomain is
dead to delete the file.
Cheers,

Greg Young
MVP - C#
http://codebetter.com/blogs/gregyoung

> Hi all,
> when I try to use the CheckIfInstallable method of
[quoted text clipped - 4 lines]
>
> Why the file remains locked? Is there a way to avoid it?

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Greg Young - 05 Jul 2006 00:26 GMT

I would put this up as a suggestion

Cheers,

Greg Young
MVP - C#
http://codebetter.com/blogs/gregyoung

> It is because Assembly.Load is run on the file (the assembly gets loaded
> into your appdomain).
[quoted text clipped - 28 lines]
>>
>> Why the file remains locked? Is there a way to avoid it?

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Damien - 05 Jul 2006 07:51 GMT

> It is because Assembly.Load is run on the file (the assembly gets loaded
> into your appdomain).
[quoted text clipped - 14 lines]
> No way to work around this I'm afraid except to wait until the appdomain is
> dead to delete the file.

So, to help the OP, he could:
1) Create a second AppDomain
2) Load either his existing code assembly or just a simple stub one in
3) Create a class in the second domain
4) Call a method on that class which performs the original
CheckIfInstallable check and returns a boolean
5) Unload the second AppDomain

correct?

Damien

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Stefano - 05 Jul 2006 10:09 GMT

Ok, thanks to everybody, I've called the method from a second AppDomain and
everything worked!

>> It is because Assembly.Load is run on the file (the assembly gets loaded
>> into your appdomain).
[quoted text clipped - 27 lines]
>
> Damien

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CheckIfInstallable method locks the file

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