MAUI: Label.Text is not working when the label has PropertyChanged event

Question

I am trying to set the label's Text value on the xaml.cs file which has PropertyChanged event. The text value is not showing on the UI with PropertyChanged event. If I remove the PropertyChanged event the text value is showing on the UI.

My Label:

	<Label 
		x:Name="selectcategory_label"
		PropertyChanged="selectcategory_label_PropertyChanged"
		Text="Select a category"
		Style="{StaticResource InvoiceUserLabelStyle}"/>

Settings text like below:

selectcategory_label.Text = "Books";

Is it a known issue?

Update

I am working on a form where I have a Title (Entry), Description (Editor), Category (Label), and a Submit Button. The Button is in disable state and after entering all the details it will be enable. That logic I have added on PropertyChanged event.

private void selectcategory_label_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
    if (!string.IsNullOrWhiteSpace(title_entry.Text) && !string.IsNullOrWhiteSpace(description_editor.Text) && selectcategory_label.Text != "Select a category")
    {
        submit_button.IsEnabled = true;
        submit_button.BackgroundColor = Color.FromArgb("#f3872c");
    }
    else
    {
        submit_button.IsEnabled = false;
        submit_button.BackgroundColor = Color.FromArgb("#d5d5d5");
    }
}

When setting category I will check the title and descriptions are available and based on that I am enabling the button. That's all I am doing on PropertyChanged event.

I commented out the code in selectcategory_label_PropertyChanged event and label is working at that time and I am working in debug mode.

Answer 1

Hello,

I commented out the code in selectcategory_label_PropertyChanged event and label is working fine at that time.

You can move this PropertyChanged="selectcategory_label_PropertyChanged" for label.

Then move this part code to a new method like following code.

public void CheckInPutValue()
{
     if (!string.IsNullOrWhiteSpace(title_entry.Text) && !string.IsNullOrWhiteSpace(description_editor.Text) && selectcategory_label.Text != "Select a category")
     {
         submit_button.IsEnabled = true;
         submit_button.BackgroundColor = Color.FromArgb("#f3872c");
     }
     else
     {
         submit_button.IsEnabled = false;
         submit_button.BackgroundColor = Color.FromArgb("#d5d5d5");
     }
}

Then add same textchange event for your Title (Entry), Description (Editor) like following code.

<Entry x:Name="title_entry" Text="" TextChanged="title_entry_TextChanged"></Entry>
<Editor x:Name="description_editor" Text="" TextChanged="title_entry_TextChanged"></Editor>

Next, check the input value in textchange event.

private void title_entry_TextChanged(object sender, TextChangedEventArgs e)
{
   
     CheckInPutValue();
}

As note, please add CheckInPutValue method in the OnAppearing() method.

protected async override void OnAppearing()
{
     CheckInPutValue();
}

Best Regards,

Leon Lu

---

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.