Cannot access a disposed object. Object name: 'PrimaryToolbarItem'.

Question

Cannot access a disposed object. Object name: 'PrimaryToolbarItem'.

I am getting above exception when I try to Navigate to a page or Go Back while running App on iOS. It works perfectly fine on Android.

I believe it started happening since I added Shell in my App.

If I comment the Toolbar Item then it starts working.

JarvanZhang 23,866 Reputation points

2020-12-14T06:27:44.887+00:00
Hi, OmairAlHamid-6628. I test the function with a normal .png file(which is placed at the Assets folder) without binding or reference, the code works fine on iOS.

<ContentPage.ToolbarItems> <ToolbarItem Text="Add" IconImageSource="test_img" Command="{Binding AddItemCommand}" /> </ContentPage.ToolbarItems>

How do you renderer the icon? Could you post more details about the 'helpers:ImageResource'?
Omair Al Hamid 21 Reputation points

2020-12-14T13:54:57.52+00:00

Hi @JarvanZhang . I am using the exact same code as shown in official Xamarin 101 video tutorial for Embedded Image . And it works fine for displaying all other embedded images (even in IOS). The only place it is not working is Toolbar (and that exception is too). As per your suggestion, I tried using it without this extension method, and it works fine, but I don't want to do that as it will mean I will need to have same Images copied over for all Platforms. Plus as I mentioned it was working absolutely fine, until now.
JarvanZhang 23,866 Reputation points

2020-12-15T08:47:25.11+00:00

Hi, OmairAlHamid-6628. I've tested the function with the Embedded image, it works fine on Android. I will test it on iOS and will update here later.

JarvanZhang 23,866 Reputation points

2020-12-14T06:27:44.887+00:00

Hi, OmairAlHamid-6628. I test the function with a normal .png file(which is placed at the Assets folder) without binding or reference, the code works fine on iOS.

<ContentPage.ToolbarItems> <ToolbarItem Text="Add" IconImageSource="test_img" Command="{Binding AddItemCommand}" /> </ContentPage.ToolbarItems>

How do you renderer the icon? Could you post more details about the 'helpers:ImageResource'?
Omair Al Hamid 21 Reputation points

2020-12-14T13:54:57.52+00:00

Hi @JarvanZhang . I am using the exact same code as shown in official Xamarin 101 video tutorial for Embedded Image . And it works fine for displaying all other embedded images (even in IOS). The only place it is not working is Toolbar (and that exception is too). As per your suggestion, I tried using it without this extension method, and it works fine, but I don't want to do that as it will mean I will need to have same Images copied over for all Platforms. Plus as I mentioned it was working absolutely fine, until now.
JarvanZhang 23,866 Reputation points

2020-12-15T08:47:25.11+00:00

Hi, OmairAlHamid-6628. I've tested the function with the Embedded image, it works fine on Android. I will test it on iOS and will update here later.

Answer 1

JarvanZhang 23,866

Hello,

Welcome to our Microsoft Q&A platform!

Cannot access a disposed object. Object name: 'PrimaryToolbarItem'.

Hi, I tested the code in a Shell project on iOS platform and faced the same issue. The Embedded works fine for the normal image in the contentPage, but it will crash for the ToolbarItem. You could report this issue to the product team on github for a solution.

If you want to place the images to shared project and load it, you could use ImageSource.FromFile() instead.

   toolbar_item.IconImageSource = ImageSource.FromFile("test.png");

Best Regards,

Jarvan Zhang

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Omair Al Hamid 21 Reputation points

2020-12-17T01:41:40.687+00:00
Thanks, @JarvanZhang . I am able to run with placing images on both iOS/Android projects. As for ImageSource.FromFile() , doesn't it require images to be placed in every project? If not then let's say I have all my images in the images folder in the shared project, then how would I use it?

toolbar_item.IconImageSource = ImageSource.FromFile("test.png");

BTW, I guess this is an existing issue on github.
JarvanZhang 23,866 Reputation points

2020-12-17T04:13:13.217+00:00
Sorry for my mistake, the ImageSource.FromFile() requires the filename or filepath that can be resolved on each platform. In Xamarin.Forms, only the Embedded images can be loaded in the shared project.

You could try using TitleView to display the icons, the Embedded image could be loaded successfully in iOS.

<Shell.TitleView> <Image Source="{local:ImageResource ProjectName.test.png}"/> </Shell.TitleView>

Cannot access a disposed object. Object name: 'PrimaryToolbarItem'.

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