FolderBrowserDialog not showing folders

  • Thread starter Thread starter Eric
  • Start date Start date
E

Eric

Hi,

I have created an application compiled with .NET 1.0. Since no folder dialog
was avialable i used an external library. Now that i'm using the .NET
framework 1.1 i removed the external library and used the
FolderBrowserDialog object. When a button is pressed i execute this code:

FolderBrowserDialog fbd = new FolderBrowserDialog ();
fbd.ShowDialog();

A Folder dialog is showed but i can't see any folders. The only thing i see
are the buttons OK & Cancel (and create new folder button when the
ShowNewFolderButton properyty is set to true). When i try the exact same
code on a different form everything is working fine. Any ideas??

Eric
 
Hi Eric

Are you using it from a form class?
If you use it straight from a class without a Hwnd then you will get that
kind of behaviour. Test is by adding a form, with a button, and put that
code in the onclick. You will see the folders now.

Good luck,
Peter
 
I'm experiencing a similar issue. A simple form program calling FolderBrowserDialog() works fine. However, when using the code in a larger program, no folders are displayed - only an empty dialog with <OK><Cancel> and <New Folder> buttons.

In both programs, the FolderBrowserDialog() is called by pressing a button on a form.

Any progress in finding a solution?

-Mark Falconer
 
* DotNetJunkies User said:
I'm experiencing a similar issue. A simple form program calling FolderBrowserDialog() works fine. However, when using the code in a larger program, no folders are displayed - only an empty dialog with <OK><Cancel> and <New Folder> buttons.

In both programs, the FolderBrowserDialog() is called by pressing a button on a form.

Any progress in finding a solution?
Click to expand...

Are you sure your 'Sub Main' or 'void Main' is marked with the
'STAThread' attribute and not with the 'MTAThread' attribute?
 
Specifying the threading model does not appear to make a difference. The simple code using FolderBrowserDialog() works with either [STAThread] or [MTAThread]. The larger program does not display files in the FolderBrowserDialog with either [STAThread] or [MTAThread].

-Mark Falconer
 
Mark,

* DotNetJunkies User said:
Specifying the threading model does not appear to make a difference. The simple code using FolderBrowserDialog() works with either [STAThread] or [MTAThread]. The larger program does not display files in the FolderBrowserDialog with either [STAThread] or [MTAThread].
Click to expand...

On my Windows XP Professional machine + .NET 1.1, specifying 'MTAThread'
prevents the folder selection control from showing. Are you using any
COM/ActiveX controls in your project? Do you see the folder selection
tree?
 
Herfried,

I've made some progress, but first to answer your questions:
1) The project uses a few Windows Forms Controls (Button, CheckBox, ComboBox, GroupBox, Label, ProgressBar, RadioButton, and StatusBar). I don't know if these contain ActiveX/COM technology.
2) When the FolderBrowserDialog 'fails', the folder selection tree is not visible.

I found the FolderBrowerDialog component works if the runtime library for linking is changed! Multi-threaded Debug (/MTd) does not work. Multi-threaded DLL (/MD or /MDd) does work!

Does this make sense?

Aside: Single-threaded (/ML or /MLd) runtime libraries cause a command line error ('/ML' and 'clr' options incompatible); and, the multi-threaded runtime library (/MT) causes several link errors.

Thanks much for your help.

Sincerely,

Mark Falconer
 
I have the same problems. Changing the link type fixed it also. This is
strange.

I am using Win XP corp, .NET 1.1, VS C++ 7.1 (2003).

Chris Lomont


DotNetJunkies User said:
Herfried,

I've made some progress, but first to answer your questions:
1) The project uses a few Windows Forms Controls (Button, CheckBox,
Click to expand...
ComboBox, GroupBox, Label, ProgressBar, RadioButton, and StatusBar). I
don't know if these contain ActiveX/COM technology.
2) When the FolderBrowserDialog 'fails', the folder selection tree is not visible.

I found the FolderBrowerDialog component works if the runtime library for
Click to expand...
linking is changed! Multi-threaded Debug (/MTd) does not work.
Multi-threaded DLL (/MD or /MDd) does work!
Does this make sense?

Aside: Single-threaded (/ML or /MLd) runtime libraries cause a command
Click to expand...
line error ('/ML' and 'clr' options incompatible); and, the multi-threaded
runtime library (/MT) causes several link errors.
Thanks much for your help.

Sincerely,

Mark Falconer
Click to expand...
engine supports Post Alerts, Ratings, and Searching.
 
I experienced the same problem running on Windows 2003 Server Standard.
Explicitly defining the STAThread attribute in the void Main seems to
have solved the problem for me.
 
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