[Page A ----PushAsync---> Page B] The sfchart is not updated when viewmodel is updated by MessageCenter?

[Yin Shun]

Hi support team,

   

     The sfdatagrid is updated async but not the sfchart.

     The attachfile contains two situation :

          Failed : Red line

          Success : Green line

Class Page_A : ContentPage{

     void btn_Calculate_Clicked(object sender, EventArgs e)

        {

            MessagingCenter.Send(this, "IpCal" , viewModel);  //The ViewModel class will handle it in async.

            Navigation.PushAsync(new Page_B(viewModel)); //Navigate to Page B with current viewModel. (See the Failed.jpg)

            //navDrawer_Calculate.ToggleDrawer(); //Toggle panel and show the data on the same page(See the Success.jpg)

        }

}

Class Page_B : ContentPage{

     ViewModel viewModel;

     public Page_B(ViewModel vm){

          BindingContext = viewModel = vm;

     }

}

Attachment: SfChart_Not_Updated_a1a10480.rar

[Yin Shun]

Hi,

   

   Is it a good solution?

   I tried to listen the ViewModel on Page_B as below:

    Class Page_B : ContentPage{

         ViewModel viewModel;

         public Page_B(ViewModel vm){

             

            BindingContext = viewModel = vm;

             

            viewModel.PropertyChanged += ViewModel_PropertyChanged;

     }

       

        private void ViewModel_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)

        {

            sfChartPremiumDetails.BindingContext = viewModel;

        }

Best regards,

Jason

[Devakumar Dhanapoosanam]

Hi Yin Shun, 

 

Greetings from Syncfusion. 

 

We have validated the reported issue and we were unable to reproduce the reported issue at our end. 

 

Can you please share the following details which will be helpful for us to analyze the reported issue at our end and provide a better solution at earlier? 

·       Please share the chart related code snippet and the ViewModel class. 

·       Please share the complete Page_B code snippet. 

 

Regards, 

Devakumar D 

[Yin Shun]

Hi,

  Thanks for reply. fyi!

Attachment: sfChart_6b8edf7.rar

[Suyamburaja Jayakumar]

Hi Yin Shun, 

 

Thanks for your update.  

 

Currently we are validating the reported issue with the provided code snippet and we will update the complete details on or before March 19, 2020.  

 

Regards, 

Suyamburaja J. 

[Yin Shun]

Hi Suyamburaja J.,

  Thanks please take your time =)!

Best regards,
Jason

[Suyamburaja Jayakumar]

Hi Yin Shun, 

 

Thanks for your patience.    

 

We have checked the provided code snippet due to some insufficient data, we have modified that sample with our temporary data to plot the chart in that it will be worked fine. Please find the tested sample in below, 

 

Sample Link: https://www.syncfusion.com/downloads/support/directtrac/general/ze/F1524361377066347.zip  

 

can you please modify the provided sample to reproduce the reported issue. which will be helpful for us to analyze further and provide a possible solution at earlier. 

 

Regards, 

Suyamburaja J. 

[Yin Shun]

Hi ,

   Thanks for your demo. According to your, it works after uncomment =)!

<!--

<chart:SfChart.BindingContext>

<viewmodels:SelectedCalIpList_ViewModel />

</chart:SfChart.BindingContext>

-->

Best regards,

Jason

[Suyamburaja Jayakumar]

Hi Yin Shun,  

  

We are glad to hear that your requirement has been achieved.  

  

Please let us know if you need any further assistance on this.  

  

Regards, 

Suyamburaja J.