小賢的部落格

結論：
1.Compiled Binding (x:Bind) 只支援Mode = OneTime，其它像OneWay、TwoWay 會 Compile error。

[UWP] 在進入背景或進入前景時，觸發OnNavigatedTo, OnNavigatedFrom。
　　每個Page都會有自己的進入頁面跟離開頁面的邏輯，有時會希望App進入背景 or 進入前景時也能夠呼叫到目前頁面的 OnNavigatedTo, OnNavigatedFrom，但預設是不會被呼叫的，

Package.appxmanifest:
<Package xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities"

參考資料：
https://www.youtube.com/watch?v=vuGSkrx8fuo

 
private const string strKey = "Key";
private const string strIV = "IV";
public static string Encrypt(string message)
{
if (string.IsNullOrEmpty(message))
{
return string.Empty;
}
var keyBuffer = CryptographicBuffer.ConvertStringToBinary(strKey, BinaryStringEncoding.Utf8);
var ivBuffer = CryptographicBuffer.ConvertStringToBinary(strIV, BinaryStringEncoding.Utf8);
var messageBuffer = CryptographicBuffer.ConvertStringToBinary(message, BinaryStringEncoding.Utf8);
var provider = SymmetricKeyAlgorithmProvider.OpenAlgorithm(SymmetricAlgorithmNames.DesCbcPkcs7);
var key = provider.CreateSymmetricKey(keyBuffer);
var buffEncrypt = CryptographicEngine.Encrypt(key, messageBuffer, ivBuffer);
return CryptographicBuffer.EncodeToBase64String(buffEncrypt);
}
public static string Decrypt(string encryptedBase64String)
{
if (string.IsNullOrEmpty(encryptedBase64String))
{
return string.Empty;
}
var buffer = CryptographicBuffer.ConvertStringToBinary(strKey, BinaryStringEncoding.Utf8);
var ivBuffer = CryptographicBuffer.ConvertStringToBinary(strIV, BinaryStringEncoding.Utf8);
var provider = SymmetricKeyAlgorithmProvider.OpenAlgorithm(SymmetricAlgorithmNames.DesCbcPkcs7);
var keyBuffer = provider.CreateSymmetricKey(buffer);
var decryptedBuffer = CryptographicEngine.Decrypt(keyBuffer, CryptographicBuffer.DecodeFromBase64String(encryptedBase64String), ivBuffer);
return CryptographicBuffer.ConvertBinaryToString(BinaryStringEncoding.Utf8, decryptedBuffer);
}

 
public partial class TakePhotoPage
{
private MediaCapture _mediaCapture;
private bool _isPreviewing;
private DisplayRequest _displayRequest;
private async Task StartPreviewAsync()
{
try
{
_mediaCapture = new MediaCapture();
await _mediaCapture.InitializeAsync();
PreviewControl.Source = _mediaCapture;
await _mediaCapture.StartPreviewAsync();
_isPreviewing = true;
_displayRequest = new DisplayRequest();
_displayRequest.RequestActive();
DisplayInformation.AutoRotationPreferences = DisplayOrientations.PortraitFlipped;
// 解決手機上的旋轉問題
SimpleOrientationSensor sensor = SimpleOrientationSensor.GetDefault();
if (sensor == null)
{
return;
}
sensor.OrientationChanged += (s, arg) =>
{
switch (arg.Orientation)
{
case SimpleOrientation.Rotated90DegreesCounterclockwise:
_mediaCapture.SetPreviewRotation(VideoRotation.None);
break;
case SimpleOrientation.Rotated180DegreesCounterclockwise:
case SimpleOrientation.Rotated270DegreesCounterclockwise:
_mediaCapture.SetPreviewRotation(VideoRotation.Clockwise180Degrees);
break;
default:
_mediaCapture.SetPreviewRotation(VideoRotation.Clockwise90Degrees);
break;
}
};
}
catch (UnauthorizedAccessException)
{
// This will be thrown if the user denied access to the camera in privacy settings
var messageDialog = new MessageDialog("The app was denied access to the camera");
await messageDialog.ShowAsync();
}
catch (Exception ex)
{
var messageDialog = new MessageDialog("MediaCapture initialization failed. {0}", ex.Message);
await messageDialog.ShowAsync();
}
}
private async Task CleanupCameraAsync()
{
if (_mediaCapture == null)
{
return;
}
if (_isPreviewing)
{
await _mediaCapture.StopPreviewAsync();
}
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
PreviewControl.Source = null;
if (_displayRequest == null)
{
return;
}
_displayRequest.RequestRelease();
});
_mediaCapture.Dispose();
_mediaCapture = null;
}
}

1.在OnNavigateTo 裡，設定是否顯示Back Button
SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = frame.CanGoBack ? AppViewBackButtonVisibility.Visible : AppViewBackButtonVisibility.Collapsed;

假如想根據不同螢幕寬度來變更GridViewItem的大小，可用Adaptive Trigger 搭配Multi Style 的方式
(UI畫面)

※ 不建議升級Win10 Mobile 10572 及Windows insider preview sdk，如果你要submit app 到Windows store 的話...
Win10 Mobile Device:
1.先將語言調成英文版
2.settings ->system->storage->New apps will save to : SD Card
Windows 10 Desktop:
1.安裝 Windows Insider Preview SDK ( 目前最新是 build 10563) 

客製化StateTriggerBase ，實現類似WinRT 8.1 的Behavior SDK DataTrigger