Windows 10 SDK Preview Build 18970 available now!

Today, we released a new Windows 10 Preview Build of the SDK to be used in conjunction with Windows 10 Insider Preview (Build 18970 or greater). The Preview SDK Build 18970 contains bug fixes and under development changes to the API surface area.

The Preview SDK can be downloaded from developer section on Windows Insider.

For feedback and updates to the known issues, please see the developer forum. For new developer feature requests, head over to our Windows Platform UserVoice.

Things to note:

• This build works in conjunction with previously released SDKs and Visual Studio 2017 and 2019. You can install this SDK and still also continue to submit your apps that target Windows 10 build 1903 or earlier to the Microsoft Store.
• The Windows SDK will now formally only be supported by Visual Studio 2017 and greater. You can download the Visual Studio 2019 here.
• This build of the Windows SDK will install on only on Windows 10 Insider Preview builds.
• In order to assist with script access to the SDK, the ISO will also be able to be accessed through the following static URL: https://software-download.microsoft.com/download/sg/Windows_InsiderPreview_SDK_en-us_18970_1.iso.

Tools Updates:

Message Compiler (mc.exe)

• Now detects the Unicode byte order mark (BOM) in .mc files. If the If the .mc file starts with a UTF-8 BOM, it will be read as a UTF-8 file. Otherwise, if it starts with a UTF-16LE BOM, it will be read as a UTF-16LE file. If the -u parameter was specified, it will be read as a UTF-16LE file. Otherwise, it will be read using the current code page (CP_ACP).
• Now avoids one-definition-rule (ODR) problems in MC-generated C/C++ ETW helpers caused by conflicting configuration macros (e.g. when two .cpp files with conflicting definitions of MCGEN_EVENTWRITETRANSFER are linked into the same binary, the MC-generated ETW helpers will now respect the definition of MCGEN_EVENTWRITETRANSFER in each .cpp file instead of arbitrarily picking one or the other).

Windows Trace Preprocessor (tracewpp.exe)

• Now supports Unicode input (.ini, .tpl, and source code) files. Input files starting with a UTF-8 or UTF-16 byte order mark (BOM) will be read as Unicode. Input files that do not start with a BOM will be read using the current code page (CP_ACP). For backwards-compatibility, if the -UnicodeIgnore command-line parameter is specified, files starting with a UTF-16 BOM will be treated as empty.
• Now supports Unicode output (.tmh) files. By default, output files will be encoded using the current code page (CP_ACP). Use command-line parameters -cp:UTF-8 or -cp:UTF-16 to generate Unicode output files.
• Behavior change: tracewpp now converts all input text to Unicode, performs processing in Unicode, and converts output text to the specified output encoding. Earlier versions of tracewpp avoided Unicode conversions and performed text processing assuming a single-byte character set. This may lead to behavior changes in cases where the input files do not conform to the current code page. In cases where this is a problem, consider converting the input files to UTF-8 (with BOM) and/or using the -cp:UTF-8 command-line parameter to avoid encoding ambiguity.

TraceLoggingProvider.h

• Now avoids one-definition-rule (ODR) problems caused by conflicting configuration macros (e.g. when two .cpp files with conflicting definitions of TLG_EVENT_WRITE_TRANSFER are linked into the same binary, the TraceLoggingProvider.h helpers will now respect the definition of TLG_EVENT_WRITE_TRANSFER in each .cpp file instead of arbitrarily picking one or the other).
• In C++ code, the TraceLoggingWrite macro has been updated to enable better code sharing between similar events using variadic templates.

Signing your apps with Device Guard Signing

• We are making it easier for you to sign your app. Device Guard signing is a Device Guard feature that is available in Microsoft Store for Business and Education. Signing allows enterprises to guarantee every app comes from a trusted source. Our goal is to make signing your MSIX package easier. Documentation on Device Guard Signing can be found here: https://docs.microsoft.com/en-us/windows/msix/package/signing-package-device-guard-signing

Breaking Changes

Removal of api-ms-win-net-isolation-l1-1-0.lib

In this release api-ms-win-net-isolation-l1-1-0.lib has been removed from the Windows SDK. Apps that were linking against api-ms-win-net-isolation-l1-1-0.lib can switch to OneCoreUAP.lib as a replacement.

Removal of IRPROPS.LIB

In this release irprops.lib has been removed from the Windows SDK. Apps that were linking against irprops.lib can switch to bthprops.lib as a drop-in replacement.

API Updates, Additions and Removals

The following APIs have been added to the platform since the release of Windows 10 SDK, version 1903, build 18362.

Additions:

 

namespace Windows.AI.MachineLearning {
  public sealed class LearningModelSessionOptions {
    bool CloseModelOnSessionCreation { get; set; }
  }
}
namespace Windows.ApplicationModel {
  public sealed class AppInfo {
    public static AppInfo Current { get; }
    Package Package { get; }
    public static AppInfo GetFromAppUserModelId(string appUserModelId);
    public static AppInfo GetFromAppUserModelIdForUser(User user, string appUserModelId);
  }
  public interface IAppInfoStatics
  public sealed class Package {
    StorageFolder EffectiveExternalLocation { get; }
    string EffectiveExternalPath { get; }
    string EffectivePath { get; }
    string InstalledPath { get; }
    bool IsStub { get; }
    StorageFolder MachineExternalLocation { get; }
    string MachineExternalPath { get; }
    string MutablePath { get; }
    StorageFolder UserExternalLocation { get; }
    string UserExternalPath { get; }
    IVectorView<AppListEntry> GetAppListEntries();
    RandomAccessStreamReference GetLogoAsRandomAccessStreamReference(Size size);
  }
}
namespace Windows.ApplicationModel.Background {
  public sealed class BluetoothLEAdvertisementPublisherTrigger : IBackgroundTrigger {
    bool IncludeTransmitPowerLevel { get; set; }
    bool IsAnonymous { get; set; }
    IReference<short> PreferredTransmitPowerLevelInDBm { get; set; }
    bool UseExtendedFormat { get; set; }
  }
  public sealed class BluetoothLEAdvertisementWatcherTrigger : IBackgroundTrigger {
    bool AllowExtendedAdvertisements { get; set; }
  }
}
namespace Windows.ApplicationModel.ConversationalAgent {
  public sealed class ActivationSignalDetectionConfiguration
  public enum ActivationSignalDetectionTrainingDataFormat
  public sealed class ActivationSignalDetector
  public enum ActivationSignalDetectorKind
  public enum ActivationSignalDetectorPowerState
  public sealed class ConversationalAgentDetectorManager
  public sealed class DetectionConfigurationAvailabilityChangedEventArgs
  public enum DetectionConfigurationAvailabilityChangeKind
  public sealed class DetectionConfigurationAvailabilityInfo
  public enum DetectionConfigurationTrainingStatus
}
namespace Windows.ApplicationModel.DataTransfer {
  public sealed class DataPackage {
    event TypedEventHandler<DataPackage, object> ShareCanceled;
  }
}
namespace Windows.Devices.Bluetooth {
  public sealed class BluetoothAdapter {
    bool IsExtendedAdvertisingSupported { get; }
    uint MaxAdvertisementDataLength { get; }
  }
}
namespace Windows.Devices.Bluetooth.Advertisement {
  public sealed class BluetoothLEAdvertisementPublisher {
    bool IncludeTransmitPowerLevel { get; set; }
    bool IsAnonymous { get; set; }
    IReference<short> PreferredTransmitPowerLevelInDBm { get; set; }
    bool UseExtendedAdvertisement { get; set; }
  }
  public sealed class BluetoothLEAdvertisementPublisherStatusChangedEventArgs {
    IReference<short> SelectedTransmitPowerLevelInDBm { get; }
  }
  public sealed class BluetoothLEAdvertisementReceivedEventArgs {
    BluetoothAddressType BluetoothAddressType { get; }
    bool IsAnonymous { get; }
    bool IsConnectable { get; }
    bool IsDirected { get; }
    bool IsScannable { get; }
    bool IsScanResponse { get; }
    IReference<short> TransmitPowerLevelInDBm { get; }
  }
  public enum BluetoothLEAdvertisementType {
    Extended = 5,
  }
  public sealed class BluetoothLEAdvertisementWatcher {
    bool AllowExtendedAdvertisements { get; set; }
  }
  public enum BluetoothLEScanningMode {
    None = 2,
  }
}
namespace Windows.Devices.Bluetooth.Background {
  public sealed class BluetoothLEAdvertisementPublisherTriggerDetails {
    IReference<short> SelectedTransmitPowerLevelInDBm { get; }
  }
}
namespace Windows.Devices.Display {
  public sealed class DisplayMonitor {
    bool IsDolbyVisionSupportedInHdrMode { get; }
  }
}
namespace Windows.Devices.Input {
  public sealed class PenButtonListener
  public sealed class PenDockedEventArgs
  public sealed class PenDockListener
  public sealed class PenTailButtonClickedEventArgs
  public sealed class PenTailButtonDoubleClickedEventArgs
  public sealed class PenTailButtonLongPressedEventArgs
  public sealed class PenUndockedEventArgs
}
namespace Windows.Devices.Sensors {
  public sealed class Accelerometer {
    AccelerometerDataThreshold ReportThreshold { get; }
  }
  public sealed class AccelerometerDataThreshold
  public sealed class Barometer {
    BarometerDataThreshold ReportThreshold { get; }
  }
  public sealed class BarometerDataThreshold
  public sealed class Compass {
    CompassDataThreshold ReportThreshold { get; }
  }
  public sealed class CompassDataThreshold
  public sealed class Gyrometer {
    GyrometerDataThreshold ReportThreshold { get; }
  }
  public sealed class GyrometerDataThreshold
  public sealed class Inclinometer {
    InclinometerDataThreshold ReportThreshold { get; }
  }
  public sealed class InclinometerDataThreshold
  public sealed class LightSensor {
    LightSensorDataThreshold ReportThreshold { get; }
  }
  public sealed class LightSensorDataThreshold
  public sealed class Magnetometer {
    MagnetometerDataThreshold ReportThreshold { get; }
  }
  public sealed class MagnetometerDataThreshold
}
namespace Windows.Foundation.Metadata {
  public sealed class AttributeNameAttribute : Attribute
  public sealed class FastAbiAttribute : Attribute
  public sealed class NoExceptionAttribute : Attribute
}
namespace Windows.Globalization {
  public sealed class Language {
    string AbbreviatedName { get; }
    public static IVector<string> GetMuiCompatibleLanguageListFromLanguageTags(IIterable<string> languageTags);
  }
}
namespace Windows.Graphics.Capture {
  public sealed class GraphicsCaptureSession : IClosable {
    bool IsCursorCaptureEnabled { get; set; }
  }
}
namespace Windows.Graphics.DirectX {
  public enum DirectXPixelFormat {
    SamplerFeedbackMinMipOpaque = 189,
    SamplerFeedbackMipRegionUsedOpaque = 190,
  }
}
namespace Windows.Graphics.Holographic {
  public sealed class HolographicFrame {
    HolographicFrameId Id { get; }
  }
  public struct HolographicFrameId
  public sealed class HolographicFrameRenderingReport
  public sealed class HolographicFrameScanoutMonitor : IClosable
  public sealed class HolographicFrameScanoutReport
  public sealed class HolographicSpace {
    HolographicFrameScanoutMonitor CreateFrameScanoutMonitor(uint maxQueuedReports);
  }
}
namespace Windows.Management.Deployment {
  public sealed class AddPackageOptions
  public enum DeploymentOptions : uint {
    StageInPlace = (uint)4194304,
  }
  public sealed class PackageManager {
    IAsyncOperationWithProgress<DeploymentResult, DeploymentProgress> AddPackageByUriAsync(Uri packageUri, AddPackageOptions options);
    IIterable<Package> FindProvisionedPackages();
    PackageStubPreference GetPackageStubPreference(string packageFamilyName);
    IAsyncOperationWithProgress<DeploymentResult, DeploymentProgress> RegisterPackageByNameAsync(string name, RegisterPackageOptions options);
    IAsyncOperationWithProgress<DeploymentResult, DeploymentProgress> RegisterPackageByUriAsync(Uri manifestUri, RegisterPackageOptions options);
    IAsyncOperationWithProgress<DeploymentResult, DeploymentProgress> RegisterPackagesByFullNameAsync(IIterable<string> packageFullNames, DeploymentOptions deploymentOptions);
    void SetPackageStubPreference(string packageFamilyName, PackageStubPreference useStub);
    IAsyncOperationWithProgress<DeploymentResult, DeploymentProgress> StagePackageByUriAsync(Uri packageUri, StagePackageOptions options);
  }
  public enum PackageStubPreference
  public enum PackageTypes : uint {
    All = (uint)4294967295,
  }
  public sealed class RegisterPackageOptions
  public enum RemovalOptions : uint {
    PreserveRoamableApplicationData = (uint)128,
  }
  public sealed class StagePackageOptions
  public enum StubPackageOptions
}
namespace Windows.Media.Audio {
  public sealed class AudioPlaybackConnection : IClosable
  public sealed class AudioPlaybackConnectionOpenResult
  public enum AudioPlaybackConnectionOpenResultStatus
  public enum AudioPlaybackConnectionState
}
namespace Windows.Media.Capture {
  public sealed class MediaCapture : IClosable {
    MediaCaptureRelativePanelWatcher CreateRelativePanelWatcher(StreamingCaptureMode captureMode, DisplayRegion displayRegion);
  }
  public sealed class MediaCaptureInitializationSettings {
    Uri DeviceUri { get; set; }
    PasswordCredential DeviceUriPasswordCredential { get; set; }
  }
  public sealed class MediaCaptureRelativePanelWatcher : IClosable
}
namespace Windows.Media.Capture.Frames {
  public sealed class MediaFrameSourceInfo {
    Panel GetRelativePanel(DisplayRegion displayRegion);
  }
}
namespace Windows.Media.Devices {
  public sealed class PanelBasedOptimizationControl
}
namespace Windows.Media.MediaProperties {
  public static class MediaEncodingSubtypes {
    public static string Pgs { get; }
    public static string Srt { get; }
    public static string Ssa { get; }
    public static string VobSub { get; }
  }
  public sealed class TimedMetadataEncodingProperties : IMediaEncodingProperties {
    public static TimedMetadataEncodingProperties CreatePgs();
    public static TimedMetadataEncodingProperties CreateSrt();
    public static TimedMetadataEncodingProperties CreateSsa(byte[] formatUserData);
    public static TimedMetadataEncodingProperties CreateVobSub(byte[] formatUserData);
  }
}
namespace Windows.Networking.BackgroundTransfer {
  public sealed class DownloadOperation : IBackgroundTransferOperation, IBackgroundTransferOperationPriority {
    void RemoveRequestHeader(string headerName);
    void SetRequestHeader(string headerName, string headerValue);
  }
  public sealed class UploadOperation : IBackgroundTransferOperation, IBackgroundTransferOperationPriority {
    void RemoveRequestHeader(string headerName);
    void SetRequestHeader(string headerName, string headerValue);
  }
}
namespace Windows.Networking.Connectivity {
  public enum NetworkAuthenticationType {
    Owe = 12,
  }
}
namespace Windows.Networking.NetworkOperators {
  public interface INetworkOperatorTetheringAccessPointConfiguration2
  public interface INetworkOperatorTetheringManagerStatics4
  public sealed class NetworkOperatorTetheringAccessPointConfiguration : INetworkOperatorTetheringAccessPointConfiguration2 {
    TetheringWiFiBand Band { get; set; }
    bool IsBandSupported(TetheringWiFiBand band);
    IAsyncOperation<bool> IsBandSupportedAsync(TetheringWiFiBand band);
  }
  public sealed class NetworkOperatorTetheringManager {
    public static void DisableNoConnectionsTimeout();
    public static IAsyncAction DisableNoConnectionsTimeoutAsync();
    public static void EnableNoConnectionsTimeout();
    public static IAsyncAction EnableNoConnectionsTimeoutAsync();
    public static bool IsNoConnectionsTimeoutEnabled();
  }
  public enum TetheringWiFiBand
}
namespace Windows.Networking.PushNotifications {
  public static class PushNotificationChannelManager {
    public static event EventHandler<PushNotificationChannelsRevokedEventArgs> ChannelsRevoked;
  }
  public sealed class PushNotificationChannelsRevokedEventArgs
  public sealed class RawNotification {
    IBuffer ContentBytes { get; }
  }
}
namespace Windows.Security.Authentication.Web.Core {
  public sealed class WebAccountMonitor {
    event TypedEventHandler<WebAccountMonitor, WebAccountEventArgs> AccountPictureUpdated;
  }
}
namespace Windows.Storage {
  public static class KnownFolders {
    public static IAsyncOperation<StorageFolder> GetFolderAsync(KnownFolderId folderId);
    public static IAsyncOperation<KnownFoldersAccessStatus> RequestAccessAsync(KnownFolderId folderId);
    public static IAsyncOperation<KnownFoldersAccessStatus> RequestAccessForUserAsync(User user, KnownFolderId folderId);
  }
  public enum KnownFoldersAccessStatus
  public sealed class StorageFile : IInputStreamReference, IRandomAccessStreamReference, IStorageFile, IStorageFile2, IStorageFilePropertiesWithAvailability, IStorageItem, IStorageItem2, IStorageItemProperties, IStorageItemProperties2, IStorageItemPropertiesWithProvider {
    public static IAsyncOperation<StorageFile> GetFileFromPathForUserAsync(User user, string path);
  }
  public sealed class StorageFolder : IStorageFolder, IStorageFolder2, IStorageFolderQueryOperations, IStorageItem, IStorageItem2, IStorageItemProperties, IStorageItemProperties2, IStorageItemPropertiesWithProvider {
    public static IAsyncOperation<StorageFolder> GetFolderFromPathForUserAsync(User user, string path);
  }
}
namespace Windows.Storage.Provider {
  public sealed class StorageProviderFileTypeInfo
  public sealed class StorageProviderSyncRootInfo {
    IVector<StorageProviderFileTypeInfo> FallbackFileTypeInfo { get; }
  }
  public static class StorageProviderSyncRootManager {
    public static bool IsSupported();
  }
}
namespace Windows.System {
  public enum UserWatcherUpdateKind
}
namespace Windows.UI.Composition.Interactions {
  public sealed class InteractionTracker : CompositionObject {
    int TryUpdatePosition(Vector3 value, InteractionTrackerClampingOption option, InteractionTrackerPositionUpdateOption posUpdateOption);
  }
  public enum InteractionTrackerPositionUpdateOption
}
namespace Windows.UI.Composition.Particles {
  public sealed class ParticleAttractor : CompositionObject
  public sealed class ParticleAttractorCollection : CompositionObject, IIterable<ParticleAttractor>, IVector<ParticleAttractor>
  public class ParticleBaseBehavior : CompositionObject
  public sealed class ParticleBehaviors : CompositionObject
  public sealed class ParticleColorBehavior : ParticleBaseBehavior
  public struct ParticleColorBinding
  public sealed class ParticleColorBindingCollection : CompositionObject, IIterable<IKeyValuePair<float, ParticleColorBinding>>, IMap<float, ParticleColorBinding>
  public enum ParticleEmitFrom
  public sealed class ParticleEmitterVisual : ContainerVisual
  public sealed class ParticleGenerator : CompositionObject
  public enum ParticleInputSource
  public enum ParticleReferenceFrame
  public sealed class ParticleScalarBehavior : ParticleBaseBehavior
  public struct ParticleScalarBinding
  public sealed class ParticleScalarBindingCollection : CompositionObject, IIterable<IKeyValuePair<float, ParticleScalarBinding>>, IMap<float, ParticleScalarBinding>
  public enum ParticleSortMode
  public sealed class ParticleVector2Behavior : ParticleBaseBehavior
  public struct ParticleVector2Binding
  public sealed class ParticleVector2BindingCollection : CompositionObject, IIterable<IKeyValuePair<float, ParticleVector2Binding>>, IMap<float, ParticleVector2Binding>
  public sealed class ParticleVector3Behavior : ParticleBaseBehavior
  public struct ParticleVector3Binding
  public sealed class ParticleVector3BindingCollection : CompositionObject, IIterable<IKeyValuePair<float, ParticleVector3Binding>>, IMap<float, ParticleVector3Binding>
  public sealed class ParticleVector4Behavior : ParticleBaseBehavior
  public struct ParticleVector4Binding
  public sealed class ParticleVector4BindingCollection : CompositionObject, IIterable<IKeyValuePair<float, ParticleVector4Binding>>, IMap<float, ParticleVector4Binding>
}
namespace Windows.UI.Input {
  public sealed class CrossSlidingEventArgs {
    uint ContactCount { get; }
 }
  public sealed class DraggingEventArgs {
    uint ContactCount { get; }
  }
  public sealed class GestureRecognizer {
    uint HoldMaxContactCount { get; set; }
    uint HoldMinContactCount { get; set; }
    float HoldRadius { get; set; }
    TimeSpan HoldStartDelay { get; set; }
    uint TapMaxContactCount { get; set; }
    uint TapMinContactCount { get; set; }
    uint TranslationMaxContactCount { get; set; }
    uint TranslationMinContactCount { get; set; }
  }
  public sealed class HoldingEventArgs {
    uint ContactCount { get; }
    uint CurrentContactCount { get; }
  }
  public sealed class ManipulationCompletedEventArgs {
    uint ContactCount { get; }
    uint CurrentContactCount { get; }
  }
  public sealed class ManipulationInertiaStartingEventArgs {
    uint ContactCount { get; }
  }
  public sealed class ManipulationStartedEventArgs {
    uint ContactCount { get; }
  }
  public sealed class ManipulationUpdatedEventArgs {
    uint ContactCount { get; }
    uint CurrentContactCount { get; }
  }
  public sealed class RightTappedEventArgs {
    uint ContactCount { get; }
  }
  public sealed class SystemButtonEventController : AttachableInputObject
  public sealed class SystemFunctionButtonEventArgs
  public sealed class SystemFunctionLockChangedEventArgs
  public sealed class SystemFunctionLockIndicatorChangedEventArgs
  public sealed class TappedEventArgs {
    uint ContactCount { get; }
  }
}
namespace Windows.UI.Input.Inking {
  public sealed class InkModelerAttributes {
    bool UseVelocityBasedPressure { get; set; }
  }
}
namespace Windows.UI.Text {
  public enum RichEditMathMode
  public sealed class RichEditTextDocument : ITextDocument {
    void GetMath(out string value);
    void SetMath(string value);
    void SetMathMode(RichEditMathMode mode);
  }
}
namespace Windows.UI.ViewManagement {
  public sealed class ApplicationView {
    bool CriticalInputMismatch { get; set; }
    ScreenCaptureDisabledBehavior ScreenCaptureDisabledBehavior { get; set; }
    bool TemporaryInputMismatch { get; set; }
    void ApplyApplicationUserModelID(string value);
  }
  public enum ScreenCaptureDisabledBehavior
  public sealed class UISettings {
    event TypedEventHandler<UISettings, UISettingsAnimationsEnabledChangedEventArgs> AnimationsEnabledChanged;
    event TypedEventHandler<UISettings, UISettingsMessageDurationChangedEventArgs> MessageDurationChanged;
  }
  public sealed class UISettingsAnimationsEnabledChangedEventArgs
  public sealed class UISettingsMessageDurationChangedEventArgs
}
namespace Windows.UI.ViewManagement.Core {
  public sealed class CoreInputView {
    event TypedEventHandler<CoreInputView, CoreInputViewHidingEventArgs> PrimaryViewHiding;
    event TypedEventHandler<CoreInputView, CoreInputViewShowingEventArgs> PrimaryViewShowing;
  }
  public sealed class CoreInputViewHidingEventArgs
  public enum CoreInputViewKind {
    Symbols = 4,
  }
  public sealed class CoreInputViewShowingEventArgs
  public sealed class UISettingsController
}
namespace Windows.UI.Xaml.Controls {
  public class HandwritingView : Control {
    UIElement HostUIElement { get; set; }
    public static DependencyProperty HostUIElementProperty { get; }
    CoreInputDeviceTypes InputDeviceTypes { get; set; }
    bool IsSwitchToKeyboardButtonVisible { get; set; }
    public static DependencyProperty IsSwitchToKeyboardButtonVisibleProperty { get; }
    double MinimumColorDifference { get; set; }
    public static DependencyProperty MinimumColorDifferenceProperty { get; }
    bool PreventAutomaticDismissal { get; set; }
    public static DependencyProperty PreventAutomaticDismissalProperty { get; }
    bool ShouldInjectEnterKey { get; set; }
    public static DependencyProperty ShouldInjectEnterKeyProperty { get; }
    event TypedEventHandler<HandwritingView, HandwritingViewCandidatesChangedEventArgs> CandidatesChanged;
    event TypedEventHandler<HandwritingView, HandwritingViewContentSizeChangingEventArgs> ContentSizeChanging;
    void SelectCandidate(uint index);
    void SetTrayDisplayMode(HandwritingViewTrayDisplayMode displayMode);
  }
  public sealed class HandwritingViewCandidatesChangedEventArgs
  public sealed class HandwritingViewContentSizeChangingEventArgs
  public enum HandwritingViewTrayDisplayMode
}
namespace Windows.UI.Xaml.Core.Direct {
  public enum XamlEventIndex {
    HandwritingView_ContentSizeChanging = 321,
  }
  public enum XamlPropertyIndex {
    HandwritingView_HostUIElement = 2395,
    HandwritingView_IsSwitchToKeyboardButtonVisible = 2393,
    HandwritingView_MinimumColorDifference = 2396,
    HandwritingView_PreventAutomaticDismissal = 2397,
    HandwritingView_ShouldInjectEnterKey = 2398,
  }
}

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Source: Windows 10 SDK Preview Build 18970 available now!