UnhandledExceptions and System.IO.FileNotFoundException

[Brian Keating]

Hi there,

I'm wondering is there any way i can gracefully handly the
System.IO.FileNotFound exception.

Let me explain my situation.

I've got a window forms app.

I've exception handlers for
AppDomain.CurrentDomain.UnhandledException
and for
Application.ThreadException
and and a try catch around my Main/Submain

Ok this is the right way to go for handling all expcetions on windows froms
from what i read.

However displaying my exception i call something like
MyTrace.Trace(excepction);

ok so still everything fine no problems..
Unless the missing assebmly that i'm trying to load is the MyTrace assembly.

Obviously i cannot use MyTrace assembly to trace that it's not there!
So what can I do?

I though ok, i can live with letting FileNotFoundExceptions being handled
with a MessageBox.Show, so where i handle the exceptions i do something like
if (excpetion is FileNotFoundException)
MessageBox(..);
else
MyBase.Trace(exception)

However I'm still getting problems. I don't know if it's the just in time
compiler or what but if MyTrace assembly is missing then i don't get the
message box!!?
It's like the Application sees that .. hey i may use MyTrace assembly better
load it.
And it seens to happen outside my try/catch/unhandled excptions

Anyone seen this before or know how to fix it?

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

Why don;t you check for the file existence:

File.Exist( path )

You could ask for the user to enter another file

cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation
"Brian Keating" <Br**********@discussions.microsoft.com> wrote in message
news:A3**********************************@microsof t.com...

Hi there,

I'm wondering is there any way i can gracefully handly the
System.IO.FileNotFound exception.

Let me explain my situation.

I've got a window forms app.

I've exception handlers for
AppDomain.CurrentDomain.UnhandledException
and for
Application.ThreadException
and and a try catch around my Main/Submain

Ok this is the right way to go for handling all expcetions on windows
froms
from what i read.

However displaying my exception i call something like
MyTrace.Trace(excepction);

ok so still everything fine no problems..
Unless the missing assebmly that i'm trying to load is the MyTrace
assembly.

Obviously i cannot use MyTrace assembly to trace that it's not there!
So what can I do?

I though ok, i can live with letting FileNotFoundExceptions being handled
with a MessageBox.Show, so where i handle the exceptions i do something
like
if (excpetion is FileNotFoundException)
MessageBox(..);
else
MyBase.Trace(exception)

However I'm still getting problems. I don't know if it's the just in time
compiler or what but if MyTrace assembly is missing then i don't get the
message box!!?
It's like the Application sees that .. hey i may use MyTrace assembly
better
load it.
And it seens to happen outside my try/catch/unhandled excptions

Anyone seen this before or know how to fix it?

[Brian Keating]

Hi Ignacio,
thanks for you help, but the file that doesn't exist is actually an assembly
that is in the gac so a simple File.Exists won't work.

Thanks for your help though

brian

"Ignacio Machin ( .NET/ C# MVP )" wrote:

Hi,

Why don;t you check for the file existence:

File.Exist( path )

You could ask for the user to enter another file

cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation
"Brian Keating" <Br**********@discussions.microsoft.com> wrote in message
news:A3**********************************@microsof t.com...

Hi there,

I'm wondering is there any way i can gracefully handly the
System.IO.FileNotFound exception.

Let me explain my situation.

I've got a window forms app.

I've exception handlers for
AppDomain.CurrentDomain.UnhandledException
and for
Application.ThreadException
and and a try catch around my Main/Submain

Ok this is the right way to go for handling all expcetions on windows
froms
from what i read.

However displaying my exception i call something like
MyTrace.Trace(excepction);

ok so still everything fine no problems..
Unless the missing assebmly that i'm trying to load is the MyTrace
assembly.

Obviously i cannot use MyTrace assembly to trace that it's not there!
So what can I do?

I though ok, i can live with letting FileNotFoundExceptions being handled
with a MessageBox.Show, so where i handle the exceptions i do something
like
if (excpetion is FileNotFoundException)
MessageBox(..);
else
MyBase.Trace(exception)

However I'm still getting problems. I don't know if it's the just in time
compiler or what but if MyTrace assembly is missing then i don't get the
message box!!?
It's like the Application sees that .. hey i may use MyTrace assembly
better
load it.
And it seens to happen outside my try/catch/unhandled excptions

Anyone seen this before or know how to fix it?

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

Ok, if the file is in the GAC then you cannot use File.Exist and I think
that the problem is that your application never is executed, as the runtime
try to load all your assemblies before running the app.

What if you load the assemblies with your code, in this way you will know if
any or which assembly failed to load.
cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"Brian Keating" <Br**********@discussions.microsoft.com> wrote in message
news:D1**********************************@microsof t.com...

Hi Ignacio,
thanks for you help, but the file that doesn't exist is actually an
assembly
that is in the gac so a simple File.Exists won't work.

Thanks for your help though

brian

"Ignacio Machin ( .NET/ C# MVP )" wrote:

Hi,

Why don;t you check for the file existence:

File.Exist( path )

You could ask for the user to enter another file

cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation
"Brian Keating" <Br**********@discussions.microsoft.com> wrote in message
news:A3**********************************@microsof t.com...

> Hi there,
>
> I'm wondering is there any way i can gracefully handly the
> System.IO.FileNotFound exception.
>
> Let me explain my situation.
>
> I've got a window forms app.
>
> I've exception handlers for
> AppDomain.CurrentDomain.UnhandledException
> and for
> Application.ThreadException
> and and a try catch around my Main/Submain
>
> Ok this is the right way to go for handling all expcetions on windows
> froms
> from what i read.
>
> However displaying my exception i call something like
> MyTrace.Trace(excepction);
>
> ok so still everything fine no problems..
> Unless the missing assebmly that i'm trying to load is the MyTrace
> assembly.
>
> Obviously i cannot use MyTrace assembly to trace that it's not there!
> So what can I do?
>
> I though ok, i can live with letting FileNotFoundExceptions being
> handled
> with a MessageBox.Show, so where i handle the exceptions i do something
> like
> if (excpetion is FileNotFoundException)
> MessageBox(..);
> else
> MyBase.Trace(exception)
>
> However I'm still getting problems. I don't know if it's the just in
> time
> compiler or what but if MyTrace assembly is missing then i don't get
> the
> message box!!?
> It's like the Application sees that .. hey i may use MyTrace assembly
> better
> load it.
> And it seens to happen outside my try/catch/unhandled excptions
>
> Anyone seen this before or know how to fix it?

[Brian Keating]

hi again,
thanks for you help,
in the end i loaded my Diagnostic Library in the case of an unhandled
exception and this did the trick.

Thanks
Brian

"Ignacio Machin ( .NET/ C# MVP )" wrote:

Hi,

Ok, if the file is in the GAC then you cannot use File.Exist and I think
that the problem is that your application never is executed, as the runtime
try to load all your assemblies before running the app.

What if you load the assemblies with your code, in this way you will know if
any or which assembly failed to load.
cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"Brian Keating" <Br**********@discussions.microsoft.com> wrote in message
news:D1**********************************@microsof t.com...

Hi Ignacio,
thanks for you help, but the file that doesn't exist is actually an
assembly
that is in the gac so a simple File.Exists won't work.

Thanks for your help though

brian

"Ignacio Machin ( .NET/ C# MVP )" wrote:

Hi,

Why don;t you check for the file existence:

File.Exist( path )

You could ask for the user to enter another file

cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation
"Brian Keating" <Br**********@discussions.microsoft.com> wrote in message
news:A3**********************************@microsof t.com...
> Hi there,
>
> I'm wondering is there any way i can gracefully handly the
> System.IO.FileNotFound exception.
>
> Let me explain my situation.
>
> I've got a window forms app.
>
> I've exception handlers for
> AppDomain.CurrentDomain.UnhandledException
> and for
> Application.ThreadException
> and and a try catch around my Main/Submain
>
> Ok this is the right way to go for handling all expcetions on windows
> froms
> from what i read.
>
> However displaying my exception i call something like
> MyTrace.Trace(excepction);
>
> ok so still everything fine no problems..
> Unless the missing assebmly that i'm trying to load is the MyTrace
> assembly.
>
> Obviously i cannot use MyTrace assembly to trace that it's not there!
> So what can I do?
>
> I though ok, i can live with letting FileNotFoundExceptions being
> handled
> with a MessageBox.Show, so where i handle the exceptions i do something
> like
> if (excpetion is FileNotFoundException)
> MessageBox(..);
> else
> MyBase.Trace(exception)
>
> However I'm still getting problems. I don't know if it's the just in
> time
> compiler or what but if MyTrace assembly is missing then i don't get
> the
> message box!!?
> It's like the Application sees that .. hey i may use MyTrace assembly
> better
> load it.
> And it seens to happen outside my try/catch/unhandled excptions
>
> Anyone seen this before or know how to fix it?