UWP C# Number.Box key press.

Question

Greetings dear M Community,

I have this code for hitting ENTER in a number box (from Microsoft.UI.Xaml).
And it has to be pressed twice until he gets wanted values - for the first time it equals a value: NaN.

Why I am facing such problem? What is the solution for this?

Answer

Hello,
Welcome to Microsoft Q&A!

Please check the following code, and update your check method with double type parameter, and use newValue to replace Number Value property.

private void NumberBox_KeyDown(object sender, KeyRoutedEventArgs e)  
{  
    if (e.Key == Windows.System.VirtualKey.Enter)  
    {  
        Task.Run(() =>  
        {             
            autoResetEvent.WaitOne();  
            check(newValue);                    
          
        });  
  
    }  
}  
  
private async void check(double roomvalue)  
{  
  
    StorageFolder folderSP = await KnownFolders.DocumentsLibrary.GetFolderAsync("Św. Puszcza App");  
    try { StorageFolder folderDATE = await folderSP.GetFolderAsync(date_string); }  
    catch { Windows.Storage.StorageFolder folderDATE = await folderSP.CreateFolderAsync(date_string, CreationCollisionOption.ReplaceExisting); }  
    StorageFolder newfolderDATE = await folderSP.GetFolderAsync(date_string);  
    try { StorageFile file = await newfolderDATE.GetFileAsync(roomvalue + ".dat"); }  
    catch { Windows.Storage.StorageFile file = await newfolderDATE.CreateFileAsync(roomvalue + ".dat", CreationCollisionOption.ReplaceExisting); }  
    Windows.Storage.StorageFile fileROOM = await newfoldeRDATE.GetFileAsync(roomvalue + ".dat");  
    string text = await Windows.Storage.FileIO.ReadTextAsync(filerROOM);  
  
  
}  
private double newValue;  
private double oldValue = -1;  
AutoResetEvent autoResetEvent = new AutoResetEvent(false);  
private void MyBox_ValueChanged(Microsoft.UI.Xaml.Controls.NumberBox sender, Microsoft.UI.Xaml.Controls.NumberBoxValueChangedEventArgs args)  
{  
  
    if (args.NewValue != double.NaN)  
    {  
        newValue = args.NewValue;  
        autoResetEvent.Set();  
    }  
  
}

Xaml

Thank you.

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UWP C# Number.Box key press.

1 answer