Passing data using Shell and remember it

Jassim Al Rahma 1,566

Hi,

I am trying to pass data from Page-A to Page-B using the following:

In Page-A:

await Shell.Current.GoToAsync($"MemberDetails?MyMember=1000", true);

and In Page-B:

[QueryProperty("Member", "MyMember")]

then:

private string member;  
public string Member  
{  
    set { member = value; }  
    get { return member; }  
}

but when I try to display the value in Page-B using:

DisplayAlert("member", member, "Ok");

It does not show any value.

Please see the attached sample.

https://www.bluefile.app/temp/ShellNavigation.zip

Kindly help..

Thanks,
Jassim

Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 41,926 Reputation points Microsoft Vendor

2022-08-18T06:50:25.783+00:00

For further investigation, could you please provide more detailed information, such as a minimal sample?

In addition, there is an official documentation about how to pass data in MAUI Shell Navigation, please refer to Pass data.

Would it be helpful for you?
Jassim Al Rahma 1,566 Reputation points

2022-08-18T16:55:22.113+00:00

Thanks,. I have updated the question with the sameple.

1 answer

Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 41,926 Reputation points Microsoft Vendor

2022-08-19T02:47:53.643+00:00
Hello,

No, there is no need to set another variable.

Your issue is caused by that you set LabelParameter.Text = member; in your page constructor method.

Therefore, your program will call LabelParameter.Text = member; at first, then call member = value; secondly.

You could use the following ways to deal with the issue:

Method 1:

You could call LabelParameter.Text = member; in the setter method:

set { member = value; LabelParameter.Text = member; }

Method 2:

You could call LabelParameter.Text = member; in the OnAppearing method:

protected override void OnAppearing() { base.OnAppearing(); LabelParameter.Text = member; }

Best Regards,

Alec Liu.

If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.
Please sign in to rate this answer.
Jassim Al Rahma 1,566 Reputation points

2022-08-19T13:22:50.543+00:00

so that means I have to set another variable called member like this:

[QueryProperty(nameof(Member), nameof(Member))] public partial class MemberDetails : ContentPage { private string Member { set { member = value; } } string member; ..................... ..................... .....................

Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 41,926 Reputation points Microsoft Vendor

2022-08-22T02:32:49.267+00:00

I've updated my answer. Could you please check it?

Jassim Al Rahma 1,566 Reputation points

2022-08-22T13:06:15.21+00:00

but using Method 1, what is the setter will look like? Please see my below updated sample:

https://www.bluefile.app/temp/ShellNavigation.zip

Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 41,926 Reputation points Microsoft Vendor

2022-08-23T02:02:30.823+00:00

I've tested your sample, and I noticed that you changed Member from public to private.

Please modify your Member property to the following:

public string Member { set { member = value; LabelParameter.Text = member; } get { return member; } }

Jassim Al Rahma 1,566 Reputation points

2022-09-14T22:42:35.4+00:00

Hi,

I have one more question please :)

Why it works only when I use the Label in the class but it won;'t work when I use it from the constructor?

See this code for example:

[QueryProperty("Organization", "MyOrganization")] public partial class StartTaqyeem : ContentPage { public string organization; public string Organization { set { organization = value; TestLabel.Text = organization; // WORKING PERFECTLY HERE } get { return organization; } } public StartTaqyeem() { InitializeComponent(); // NOT WORKING HERE IF I REMOVE THE LIBE AT THE TOP AND KEEP IT HERE ONLY; TestLabel.Text = organization; } .................... .................... .................... .................... .................... .................... }

Kindly help..

Thanks,
Jassim

Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 41,926 Reputation points Microsoft Vendor

2022-09-15T05:21:39.593+00:00

This is because the constructor executes first, at which point organization has not yet acquired a value.

You could verify this by stepping through breakpoint debugging.

Jassim Al Rahma 1,566 Reputation points

2022-09-16T12:33:45.653+00:00

Then what will be the solution to save the variable across the entire page?

Jassim Al Rahma 1,566 Reputation points

2022-09-27T22:21:06.473+00:00

any solution for this?
Sign in to comment

Use comments to ask for clarification, additional information, or improvements to the question.

Share via

Passing data using Shell and remember it

1 answer

Your answer