LateBoundBitmapDecoder Class

Reference

Definition

Namespace:: System.Windows.Media.Imaging

Assembly:: PresentationCore.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Defines a decoder that requires delayed bitmap creation such as asynchronous image downloads.

public ref class LateBoundBitmapDecoder sealed : System::Windows::Media::Imaging::BitmapDecoder

public sealed class LateBoundBitmapDecoder : System.Windows.Media.Imaging.BitmapDecoder

type LateBoundBitmapDecoder = class
    inherit BitmapDecoder

Public NotInheritable Class LateBoundBitmapDecoder
Inherits BitmapDecoder

Inheritance: Object

DispatcherObject

BitmapDecoder
LateBoundBitmapDecoder

Remarks

A LateBoundBitmapDecoder is used when DelayCreation is specified. The Decoder property creates the necessary "real decoder" on an on-demand basis. All decoder properties return null while content is downloading.

A LateBoundBitmapDecoder can also be created when the system has an image that is being asynchronously downloaded locally. In this case, the decoder also returns null for properties until the image has been downloaded. The application can check the IsDownloading property or add a delegate for the DownloadCompleted event to monitor the download status. Furthermore, any frames obtained from a LateBoundBitmapDecoder while the image is downloading will return a width/height of 1,1 until the frames have finished downloading.

BitmapFrame objects that are returned by this class are frozen and are therefore immutable.

Properties

CodecInfo	Gets information that describes this codec.
ColorContexts	Gets a value that represents the color profile that is associated with a bitmap, if one is defined.
Decoder	Gets the underlying decoder that is associated with this late-bound decoder.
Dispatcher	Gets the Dispatcher this DispatcherObject is associated with. (Inherited from DispatcherObject)
Frames	Gets the content of an individual frame within a bitmap.
IsDownloading	Gets a value that indicates whether the decoder is currently downloading content.
Metadata	Gets an instance of BitmapMetadata that represents the global metadata associated with this bitmap, if metadata is defined. (Inherited from BitmapDecoder)
Palette	Gets the BitmapPalette that is associated with this decoder.
Preview	Gets a BitmapSource that represents the global preview of this bitmap, if one is defined.
Thumbnail	Gets a BitmapSource that represents the thumbnail of the bitmap, if one is defined.

Methods

CheckAccess()	Determines whether the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject)
CreateInPlaceBitmapMetadataWriter()	Creates an instance of InPlaceBitmapMetadataWriter, which can be used to update the metadata of a bitmap. (Inherited from BitmapDecoder)
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetType()	Gets the Type of the current instance. (Inherited from Object)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
ToString()	Converts the current value of a BitmapDecoder to a String. (Inherited from BitmapDecoder)
VerifyAccess()	Enforces that the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject)

Events

DownloadCompleted	Occurs when a BitmapDecoder has finished downloading bitmap content. (Inherited from BitmapDecoder)
DownloadFailed	Occurs when bitmap content failed to download. (Inherited from BitmapDecoder)
DownloadProgress	Occurs when a BitmapDecoder has made progress downloading bitmap content. (Inherited from BitmapDecoder)

Applies to

แชร์ผ่าน