Another Simple Binding Question

Question

When I click on a button in xaml, instead of directly opening a new page, I wait for a response from a DisplayPromptAsync to give me a name...

        private async void AddOperatorButton_Clicked(object sender, EventArgs e)
        {
            string newOp = await DisplayPromptAsync("Enter New Operator", "New Operator Name/Callsign (no spaces)");
            if (newOp != null) { 
                // await DisplayAlert("New Operator", "The new Operator is... " + newOp, "OK");
                await Navigation.PushModalAsync(new NewOperatorPage (newOp)
                { 
                  BindingContext = new OperatorModel()
                });
            }
        }

I pass this name to the new page and I want it to populate the "NameEntry" entry of the newly opened xaml page:

                    <Entry
                        x:Name="NameEntry"
                        Text="{ Binding OperatorName}"
                        Placeholder="Enter a name/callsign (no spaces)"
                        PlaceholderColor="LightGray"
                        TextColor="DarkBlue"
                        FontSize="16"
                        Keyboard="Text"
                        Grid.Row="0"
                        Grid.Column="1"
                        Margin="0, 0, 20, 0"/>

How do I do this?

Answer 1

Hi Grime,

Welcome to our Microsoft Q&A platform!

You should create the constructor for OperatorModel, rather than NewOperatorPage.

The following is the simple demo.

OperatorModel.cs

class OperatorModel  
{  
    public string OperatorName { get; set; }  
  
    public OperatorModel(string ope)  
    {  
        OperatorName = ope;  
    }  
}  

MainPage.xaml.cs

private async void AddOperatorButton_Clicked(object sender, EventArgs e)  
{  
    string newOp = await DisplayPromptAsync("Enter New Operator", "New Operator Name/Callsign (no spaces)");  
    if (newOp != null)  
    {  
        await Navigation.PushModalAsync(new NewOperatorPage()  
        {  
            BindingContext = new OperatorModel(newOp)  
        });  
    }  
}  

Regards,
Kyle

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