Forums Home / ComponentOne / WinForms Edition
Posted by: kasun.vidyarathna on 22 March 2018, 11:45 pm EST
kasun.vidyarathna
Posted 22 March 2018, 11:45 pm EST
Hi,
Relates to win-form edition - C1StudioInstaller20161.1.12
We are having serious issues with component one at the moment as it doesn’t let us open the designer file for most of the win forms.
It complain about completely unrelated file sitting in this project
i.e “Value cannot be null. Parameter name: String” and points to a line number in a file which this form doesn’t even use.
Can someone please let us know what can be do regarding this
Thanks
esha.dhir
Posted 25 March 2018, 3:49 pm EST
Hello,
Did you use this link for installing 2016 v1 version of the studio?
http://cdn.componentone.com/files/studioinstaller/C1StudioInstaller20161.1.12.exe
Generally this error is observed when there are incorrect references present in the project. We suggest you to try the following steps:
C1.Win.C1Themes.C1ThemeController, C1.Win.C1Themes.4, Version=4.0.20181.296, Culture=neutral, PublicKeyToken=594a0605db191ac1
should be writtten as:
C1.Win.C1Themes.C1ThemeController, C1.Win.C1Themes.4
Also, you can try using the newer ComponentOne version from the below mentioned link:
http://cdn.componentone.com/files/studioinstaller/C1StudioInstaller20173.1.9.exe
Let us know if you still face any issues.
Best Regards,
Esha
kasun.vidyarathna
Posted 25 March 2018, 7:46 pm EST
Hi Esha,
Thanks for the reply. We have followed all the steps (apart from installing the new version) but still no luck.
Also, we get this attached error in one of the form which complains that
“Only object of the type C1DockingTabPage can be added to the Controls collection of C1DockingTab.”
But in in code few C1DockingTabPages are added to one of the C1DockingTab. This all works fine when you run the application, but gives the error when try to open the designer and cannot do any changes because of this.
Please see attached snip from .designer file
Thanks
esha.dhir
Posted 26 March 2018, 5:56 pm EST
Hello,
“Value cannot be null. Parameter name: String”
It seems that a string is being parsed somewhere, but it does not have a value at a particular point.
However, we would request you to try updating your sample using the C1ProjectUpdater utility. For your information, it can be used from the below mentioned link:
https://www.grapecity.com/en/blogs/c1projectupdater-utility/
Also, it is present under “GrapeCity License Manager” option in the Tools menu of Visual Studio.
“Only object of the type C1DockingTabPage can be added to the Controls collection of C1DockingTab.”
This error is observed when you are trying to add controls while C1DockingTab is selected. As the error says, you can only add C1DockingTabPage type objects to a C1DockingTab. Ensure that you are not doing so by code while upgrading the sample. Also, ensure that you are not trying to drag and drop a control on a C1DockingTab at any point.
If you still face the issue, kindly share a stripped down sample replicating the errors so that we can assist you further, at the earliest. If you still face the issue, kindly share a stripped down sample replicating the errors. Also, please share your system environment details. This will help us assist you further, at the earliest.
Best Regards,
Esha
or.anandaraman
Posted 6 November 2019, 8:15 pm EST
Hi,
May I know the solution for this error “Only object of the type C1DockingTabPage can be added to the Controls collection of C1DockingTab.”?
I’m not able to open the Form in designer mode. In form 1 C1DockingTab and 3 C1DockingTabPage controls available. All the 3 C1DockingTabPage added to C1DockingTab in design time.
As mentioned “This error is observed when you are trying to add controls while C1DockingTab is selected.” how to unselect during design time.
jitender.yadav
Posted 6 November 2019, 9:24 pm EST
Hi,
Can you please confirm whether design item error occurs immediately after opening Form in design view or after dropping a control from Toolbox onto the Form?
In the former case, the error is observed when a control other than C1DockingTabPage is added at runtime (which is probably not true in your case). Do you observe any error when executing the application?
In the latter case, just make sure that you are not dropping a non-C1DockingTabPage control on C1DockingTab.
If you still observe this issue, I would request you to attach a small sample which shows this behavior so we can further investigate it.
Thanks,
Jitender
or.anandaraman
Posted 6 November 2019, 10:42 pm EST
The form was designed long back, now I want to add a new control. So I’m trying to open, but getting the error when I open immediately after opening form in design view.
I’m not getting any error during run time. Also, no controls added to C1DockingTab during run time.
As mentioned earlier, only 3 C1DockingTabPages added to C1DockingTab in design time.
below is code snippet
this.tabCollection.Controls.Add(this.tabOverview);
this.tabCollection.Controls.Add(this.tabDocuments);
this.tabCollection.Controls.Add(this.tabActivityAll);
jitender.yadav
Posted 6 November 2019, 10:47 pm EST
Can you please post the stack trace so we can see where the issue might be?
or.anandaraman
Posted 6 November 2019, 11:07 pm EST
I’m getting this issue while opening designer form.
jitender.yadav
Posted 6 November 2019, 11:10 pm EST
Please post a screenshot of the error.
or.anandaraman
Posted 6 November 2019, 11:15 pm EST - Updated 3 October 2022, 3:34 pm EST
jitender.yadav
Posted 7 November 2019, 3:58 pm EST - Updated 3 October 2022, 3:34 pm EST
Hi,
It’s difficult to tell anything from this error alone.
Do you get a page like this [https://docs.microsoft.com/en-us/dotnet/framework/winforms/controls/design-time-errors-in-the-windows-forms-designer] on the Form?
If not, then please follow these steps:
In Visual Studio, open the project where this issue occurs.
Open another instance of Visual Studio (this would be used as the debugger).
In the debugger VB, go to “Debug > Attach to Process”.
In the “Attach to Process” window, select the “devenv.exe” process which corresponds to the VS instance in step-1. Click on “Attach” button. [See attached screenshot for reference].
Open VS instance from step-1, and open the Form designer.
The debugger VS instance should stop at the error where you should be able to see the stacktrace.
If this does not help, then we request to create a small sample where we can further investigate it.
Thanks,
Jitender
