BitmapSource 類別

定義

代表特定大小與解析度之像素的單一且固定的集合。Represents a single, constant set of pixels at a certain size and resolution.

public ref class BitmapSource abstract : System::Windows::Media::ImageSource
[System.Windows.Localizability(System.Windows.LocalizationCategory.None, Readability=System.Windows.Readability.Unreadable)]
public abstract class BitmapSource : System.Windows.Media.ImageSource
type BitmapSource = class
    inherit ImageSource
    interface DUCE.IResource
Public MustInherit Class BitmapSource
Inherits ImageSource
繼承
衍生
屬性

範例

下列程式碼範例示範如何建立 BitmapSource,並將它當做 Image 控制項的來源使用。The following code example demonstrates how to create a BitmapSource and use it as the source of an Image control.

// Define parameters used to create the BitmapSource.
PixelFormat pf = PixelFormats.Bgr32;
int width = 200;
int height = 200;
int rawStride = (width * pf.BitsPerPixel + 7) / 8;
byte[] rawImage = new byte[rawStride * height];

// Initialize the image with data.
Random value = new Random();
value.NextBytes(rawImage);

// Create a BitmapSource.
BitmapSource bitmap = BitmapSource.Create(width, height,
    96, 96, pf, null,
    rawImage, rawStride);

// Create an image element;
Image myImage = new Image();
myImage.Width = 200;
// Set image source.
myImage.Source = bitmap;
' Define parameters used to create the BitmapSource.
Dim pf As PixelFormat = PixelFormats.Bgr32
Dim width As Integer = 200
Dim height As Integer = 200
Dim rawStride As Integer = CType((width * pf.BitsPerPixel + 7) / 8, Integer)
Dim rawImage(rawStride * height) As Byte

' Initialize the image with data.
Dim value As New Random()
value.NextBytes(rawImage)

' Create a BitmapSource.
Dim bitmap As BitmapSource = BitmapSource.Create(width, height, 96, 96, pf, Nothing, rawImage, rawStride)

' Create an image element;
Dim myImage As New Image()
myImage.Width = 200
' Set image source.
myImage.Source = bitmap

下列程式碼範例會使用 BitmapSource 的衍生類別(BitmapImage),從影像檔案建立點陣圖,並使用它做為 Image 控制項的來源。The following code example uses a BitmapSource derived class, BitmapImage, to create a bitmap from an image file and use it as the source of an Image control.

// Create the image element.
Image simpleImage = new Image();    
simpleImage.Width = 200;
simpleImage.Margin = new Thickness(5);

// Create source.
BitmapImage bi = new BitmapImage();
// BitmapImage.UriSource must be in a BeginInit/EndInit block.
bi.BeginInit();
bi.UriSource = new Uri(@"/sampleImages/cherries_larger.jpg",UriKind.RelativeOrAbsolute);
bi.EndInit();
// Set the image source.
simpleImage.Source = bi;
' Create the image element.
Dim simpleImage As New Image()
simpleImage.Width = 200
simpleImage.Margin = New Thickness(5)

' Create source.
Dim bi As New BitmapImage()
' BitmapImage.UriSource must be in a BeginInit/EndInit block.
bi.BeginInit()
bi.UriSource = New Uri("/sampleImages/cherries_larger.jpg", UriKind.RelativeOrAbsolute)
bi.EndInit()
' Set the image source.
simpleImage.Source = bi

備註

BitmapSourceWindows Presentation Foundation (WPF)Windows Presentation Foundation (WPF) 影像管線的基本建立區塊,在概念上代表特定大小和解析度的一組固定圖元。BitmapSource is the basic building block of the Windows Presentation Foundation (WPF)Windows Presentation Foundation (WPF) imaging pipeline, conceptually representing a single, constant set of pixels at a certain size and resolution. BitmapSource 可以是影像檔案中的單一框架,而此檔案是由解碼器提供,也可能是在本身的 BitmapSource 上運作的轉換結果。A BitmapSource could be a single frame in an image file that a decoder provides, or it could be the result of a transform that operates on a BitmapSource of its own. BitmapSource 不是用來代表多框架影像或動畫。BitmapSource is not used to represent a multi-frame image or an animation.

Windows Presentation Foundation (WPF)Windows Presentation Foundation (WPF) 原本就支援 點陣圖 (BMP)bitmap (BMP)圖形交換格式 (GIF)Graphics Interchange Format (GIF)JPEG 格式 (JPEG)Joint Photographics Experts Group (JPEG)Portable Network Graphics (PNG)Portable Network Graphics (PNG)標記的影像檔案格式 (TIFF)Tagged Image File Format (TIFF) 映射的壓縮和解壓縮。natively supports compression and decompression of 點陣圖 (BMP)bitmap (BMP), 圖形交換格式 (GIF)Graphics Interchange Format (GIF), JPEG 格式 (JPEG)Joint Photographics Experts Group (JPEG), Portable Network Graphics (PNG)Portable Network Graphics (PNG), and 標記的影像檔案格式 (TIFF)Tagged Image File Format (TIFF) images.

對於點陣圖解碼案例,BitmapSource 會根據使用者系統上已安裝的編解碼器,使用自動編解碼器探索。For bitmap decoding scenarios, BitmapSource uses automatic codec discovery, based on the installed codecs on the user's system.

影像的最大高度和寬度是 2 ^ 16 圖元,每個通道32位 * 4 個通道。The maximum height and width of an image is 2^16 pixels at 32 bits per channel * 4 channels. BitmapSource 的大小上限為 2 ^ 32 個位元組(64 gb),而最大影像大小為四個 gigapixels。The maximum size of a BitmapSource is 2^32 bytes (64 gigabytes) and the maximum image size is four gigapixels. 影像大小下限為1x1。The minimum image size is 1x1.

建構函式

BitmapSource()

初始化 BitmapSource 類別的新執行個體。Initializes a new instance of the BitmapSource class.

屬性

CanFreeze

取得值,指出是否可以將物件設為不可修改。Gets a value that indicates whether the object can be made unmodifiable.

(繼承來源 Freezable)
DependencyObjectType

取得包裝此執行個體之 CLRCLR 型別的 DependencyObjectTypeGets the DependencyObjectType that wraps the CLRCLR type of this instance.

(繼承來源 DependencyObject)
Dispatcher

取得與這個 Dispatcher 關聯的 DispatcherObjectGets the Dispatcher this DispatcherObject is associated with.

(繼承來源 DispatcherObject)
DpiX

取得影像的水平 DPI (每英吋的點數)dots per inch (dpi)Gets the horizontal DPI (每英吋的點數)dots per inch (dpi) of the image.

DpiY

取得影像的垂直 DPI (每英吋的點數)dots per inch (dpi)Gets the vertical DPI (每英吋的點數)dots per inch (dpi) of the image.

Format

取得點陣圖資料的原生 PixelFormatGets the native PixelFormat of the bitmap data.

HasAnimatedProperties

取得值,這個值表示是否有一個或多個 AnimationClock 物件與這個物件的任何一個相依性屬性相關聯。Gets a value that indicates whether one or more AnimationClock objects is associated with any of this object's dependency properties.

(繼承來源 Animatable)
Height

取得來源點陣圖的高度,裝置獨立單位 (每單位 1/96 英吋)device-independent units (1/96th inch per unit)Gets the height of the source bitmap in 裝置獨立單位 (每單位 1/96 英吋)device-independent units (1/96th inch per unit).

IsDownloading

取得值,這個值表示目前是否正在下載 BitmapSource 內容。Gets a value that indicates whether the BitmapSource content is currently downloading.

IsFrozen

取得值,該值表示物件目前是否可修改。Gets a value that indicates whether the object is currently modifiable.

(繼承來源 Freezable)
IsSealed

取得值,這個值表示此執行個體目前是否已密封 (唯讀)。Gets a value that indicates whether this instance is currently sealed (read-only).

(繼承來源 DependencyObject)
Metadata

取得與這個點陣圖影像相關聯的中繼資料 (Metadata)。Gets the metadata that is associated with this bitmap image.

Palette

取得點陣圖的色板 (如果有指定的話)。Gets the color palette of the bitmap, if one is specified.

PixelHeight

取得點陣圖的高度 (以像素為單位)。Gets the height of the bitmap in pixels.

PixelWidth

取得點陣圖的寬度 (以像素為單位)。Gets the width of the bitmap in pixels.

Width

取得點陣圖的寬度,裝置獨立單位 (每單位 1/96 英吋)device-independent units (1/96th inch per unit)Gets the width of the bitmap in 裝置獨立單位 (每單位 1/96 英吋)device-independent units (1/96th inch per unit).

方法

ApplyAnimationClock(DependencyProperty, AnimationClock)

AnimationClock 套用至指定的 DependencyPropertyApplies an AnimationClock to the specified DependencyProperty. 如果屬性已有動畫效果,即使用 SnapshotAndReplace 遞移式行為。If the property is already animated, the SnapshotAndReplace handoff behavior is used.

(繼承來源 Animatable)
ApplyAnimationClock(DependencyProperty, AnimationClock, HandoffBehavior)

AnimationClock 套用至指定的 DependencyPropertyApplies an AnimationClock to the specified DependencyProperty. 如果已建立屬性的動畫,則會使用指定的 HandoffBehaviorIf the property is already animated, the specified HandoffBehavior is used.

(繼承來源 Animatable)
BeginAnimation(DependencyProperty, AnimationTimeline)

將動畫套用至指定的 DependencyPropertyApplies an animation to the specified DependencyProperty. 呈現下一個畫面格後,就會啟動動畫。The animation is started when the next frame is rendered. 如果指定的屬性已有動畫效果,即使用 SnapshotAndReplace 遞移式行為。If the specified property is already animated, the SnapshotAndReplace handoff behavior is used.

(繼承來源 Animatable)
BeginAnimation(DependencyProperty, AnimationTimeline, HandoffBehavior)

將動畫套用至指定的 DependencyPropertyApplies an animation to the specified DependencyProperty. 呈現下一個畫面格後,就會啟動動畫。The animation is started when the next frame is rendered. 如果已建立指定之屬性的動畫,則會使用指定的 HandoffBehaviorIf the specified property is already animated, the specified HandoffBehavior is used.

(繼承來源 Animatable)
CheckAccess()

判斷呼叫的執行是否可以存取這個 DispatcherObjectDetermines whether the calling thread has access to this DispatcherObject.

(繼承來源 DispatcherObject)
CheckIfSiteOfOrigin()

檢查點陣圖來源內容是否來自已知的來源網站。Checks whether the bitmap source content is from a known site of origin. 這個方法可用來確定像素複製作業是安全的。This method is used to make sure that pixel copying operations are safe.

ClearValue(DependencyProperty)

清除屬性的區域數值。Clears the local value of a property. 要清除的屬性是由 DependencyProperty 識別項所指定。The property to be cleared is specified by a DependencyProperty identifier.

(繼承來源 DependencyObject)
ClearValue(DependencyPropertyKey)

清除唯讀屬性的區域數值。Clears the local value of a read-only property. 要清除的屬性是由 DependencyPropertyKey 所指定。The property to be cleared is specified by a DependencyPropertyKey.

(繼承來源 DependencyObject)
Clone()

建立這個 BitmapSource 的可修改複製品,深層複製這個物件的值。Creates a modifiable clone of this BitmapSource, making deep copies of this object's values. 當複製相依性屬性時,這個方法會複製資源參考和資料繫結 (但可能無法再解析),但不會複製動畫或它們目前的值。When copying dependency properties, this method copies resource references and data bindings (but they might no longer resolve) but not animations or their current values.

CloneCore(Freezable)

使這個執行個體成為指定之 BitmapSource 的深層複本。Makes this instance a deep copy of the specified BitmapSource. 當複製相依性屬性時,這個方法會複製資源參考和資料繫結 (但可能無法再解析),但不會複製動畫或它們目前的值。When copying dependency properties, this method copies resource references and data bindings (but they might no longer resolve) but not animations or their current values.

CloneCurrentValue()

建立這個 BitmapSource 物件的可修改複製品,製作這個物件目前值的深層複本。Creates a modifiable clone of this BitmapSource object, making deep copies of this object's current values. 不會複製資源參考、資料繫結和動畫,但是會複製其目前值。Resource references, data bindings, and animations are not copied, but their current values are.

CloneCurrentValueCore(Freezable)

使用目前的屬性值,讓這個執行個體成為指定之 BitmapSource 的可修改深層複本。Makes this instance a modifiable deep copy of the specified BitmapSource using current property values. 不會複製資源參考、資料繫結和動畫,但是會複製其目前值。Resource references, data bindings, and animations are not copied, but their current values are.

CoerceValue(DependencyProperty)

強制轉型所指定相依性屬性的值。Coerces the value of the specified dependency property. 完成方式是叫用存在於呼叫 DependencyObject 之相依性屬性的屬性中繼資料中所指定的任何 CoerceValueCallback 函式。This is accomplished by invoking any CoerceValueCallback function specified in property metadata for the dependency property as it exists on the calling DependencyObject.

(繼承來源 DependencyObject)
CopyPixels(Array, Int32, Int32)

將點陣圖像素資料複製到具有所指定步距 的像素陣列 (從指定的位移 (Offset) 開始)。Copies the bitmap pixel data into an array of pixels with the specified stride, starting at the specified offset.

CopyPixels(Int32Rect, Array, Int32, Int32)

將指定之矩形內的點陣圖像素資料,複製到具有所指定步距的像素陣列 (從指定的位移開始)。Copies the bitmap pixel data within the specified rectangle into an array of pixels that has the specified stride starting at the specified offset.

CopyPixels(Int32Rect, IntPtr, Int32, Int32)

複製指定矩形內的點陣圖像素資料。Copies the bitmap pixel data within the specified rectangle.

Create(Int32, Int32, Double, Double, PixelFormat, BitmapPalette, Array, Int32)

從像素陣列建立新的 BitmapSourceCreates a new BitmapSource from an array of pixels.

Create(Int32, Int32, Double, Double, PixelFormat, BitmapPalette, IntPtr, Int32, Int32)

從儲存在 Unmanaged 記憶體內的像素陣列,建立新的 BitmapSourceCreates a new BitmapSource from an array of pixels that are stored in unmanaged memory.

CreateInstance()

初始化 Freezable 類別的新執行個體。Initializes a new instance of the Freezable class.

(繼承來源 Freezable)
CreateInstanceCore()

在衍生類別中實作時,建立 Freezable 衍生類別的新執行個體。When implemented in a derived class, creates a new instance of the Freezable derived class.

(繼承來源 Freezable)
Equals(Object)

判斷提供的 DependencyObject 和目前的 DependencyObject 是否相等。Determines whether a provided DependencyObject is equivalent to the current DependencyObject.

(繼承來源 DependencyObject)
Freeze()

將目前的物件設為不可修改,並將其 IsFrozen 屬性設定為 trueMakes the current object unmodifiable and sets its IsFrozen property to true.

(繼承來源 Freezable)
FreezeCore(Boolean)

BitmapSource 的執行個體或衍生類別製作為不變的。Makes an instance of BitmapSource or a derived class immutable.

GetAnimationBaseValue(DependencyProperty)

傳回指定之 DependencyProperty 的非動畫實值。Returns the non-animated value of the specified DependencyProperty.

(繼承來源 Animatable)
GetAsFrozen()

使用基底 (非動畫) 屬性值,建立 Freezable 的凍結複本。Creates a frozen copy of the Freezable, using base (non-animated) property values. 因為複本已凍結,所以會以傳址方式複製任何凍結子物件。Because the copy is frozen, any frozen sub-objects are copied by reference.

(繼承來源 Freezable)
GetAsFrozenCore(Freezable)

使這個執行個體成為指定之 BitmapSource 物件的複製。Makes this instance a clone of the specified BitmapSource object.

GetCurrentValueAsFrozen()

使用目前屬性值,建立 Freezable 的凍結複本。Creates a frozen copy of the Freezable using current property values. 因為複本已凍結,所以會以傳址方式複製任何凍結子物件。Because the copy is frozen, any frozen sub-objects are copied by reference.

(繼承來源 Freezable)
GetCurrentValueAsFrozenCore(Freezable)

使這個執行個體成為所指定 BitmapSource 的凍結複製品。Makes this instance a frozen clone of the specified BitmapSource. 不會複製資源參考、資料繫結和動畫,但是會複製其目前值。Resource references, data bindings, and animations are not copied, but their current values are.

GetHashCode()

取得這個 DependencyObject 的雜湊碼。Gets a hash code for this DependencyObject.

(繼承來源 DependencyObject)
GetLocalValueEnumerator()

建立特定的列舉值,以判斷哪些相依性屬性在此 DependencyObject 上具有本機設定的值。Creates a specialized enumerator for determining which dependency properties have locally set values on this DependencyObject.

(繼承來源 DependencyObject)
GetType()

取得目前執行個體的 TypeGets the Type of the current instance.

(繼承來源 Object)
GetValue(DependencyProperty)

傳回 DependencyObject 的這個執行個體上之相依性屬性的目前有效值。Returns the current effective value of a dependency property on this instance of a DependencyObject.

(繼承來源 DependencyObject)
InvalidateProperty(DependencyProperty)

重新評估指定相依性屬性的有效值。Re-evaluates the effective value for the specified dependency property.

(繼承來源 DependencyObject)
MemberwiseClone()

建立目前 Object 的淺層複本 (Shallow Copy)。Creates a shallow copy of the current Object.

(繼承來源 Object)
OnChanged()

目前的 Freezable 物件遭到修改時進行呼叫。Called when the current Freezable object is modified.

(繼承來源 Freezable)
OnFreezablePropertyChanged(DependencyObject, DependencyObject)

確定已為剛剛設定的 DependencyObjectType 資料成員,建立適當的內容指標。Ensures that appropriate context pointers are established for a DependencyObjectType data member that has just been set.

(繼承來源 Freezable)
OnFreezablePropertyChanged(DependencyObject, DependencyObject, DependencyProperty)

這個成員支援 Windows Presentation Foundation (WPF)Windows Presentation Foundation (WPF) 基礎結構,但是您不可以從程式碼直接使用它。This member supports the Windows Presentation Foundation (WPF)Windows Presentation Foundation (WPF) infrastructure and is not intended to be used directly from your code.

(繼承來源 Freezable)
OnPropertyChanged(DependencyPropertyChangedEventArgs)

覆寫 OnPropertyChanged(DependencyPropertyChangedEventArgs)DependencyObject 實作也可以叫用任何 Changed 處理常式,以回應類型 Freezable 的變更相依性屬性。Overrides the DependencyObject implementation of OnPropertyChanged(DependencyPropertyChangedEventArgs) to also invoke any Changed handlers in response to a changing dependency property of type Freezable.

(繼承來源 Freezable)
ReadLocalValue(DependencyProperty)

傳回相依性屬性的區域值 (如果存在)。Returns the local value of a dependency property, if it exists.

(繼承來源 DependencyObject)
ReadPreamble()

確定 Freezable 是從有效的執行緒進行存取。Ensures that the Freezable is being accessed from a valid thread. 如果 API 會讀取非相依性屬性的資料成員,則 Freezable 的繼承者必須在該 API 的開頭呼叫這個方法。Inheritors of Freezable must call this method at the beginning of any API that reads data members that are not dependency properties.

(繼承來源 Freezable)
SetCurrentValue(DependencyProperty, Object)

設定相依性屬性的值,而不需要變更其值來源。Sets the value of a dependency property without changing its value source.

(繼承來源 DependencyObject)
SetValue(DependencyProperty, Object)

設定相依性屬性的區域值 (由相依性屬性的識別碼所指定)。Sets the local value of a dependency property, specified by its dependency property identifier.

(繼承來源 DependencyObject)
SetValue(DependencyPropertyKey, Object)

設定唯讀相依性屬性的區域數值 (由相依性屬性的 DependencyPropertyKey 識別項所指定)。Sets the local value of a read-only dependency property, specified by the DependencyPropertyKey identifier of the dependency property.

(繼承來源 DependencyObject)
ShouldSerializeProperty(DependencyProperty)

傳回值,這個值表示序列化程序是否應該序列化所提供相依性屬性的值。Returns a value that indicates whether serialization processes should serialize the value for the provided dependency property.

(繼承來源 DependencyObject)
ToString()

根據目前的文化特性,建立這個物件的字串表示。Creates a string representation of this object based on the current culture.

(繼承來源 ImageSource)
ToString(IFormatProvider)

根據傳入的 IFormatProvider,建立這個物件的字串表示。Creates a string representation of this object based on the IFormatProvider passed in. 如果提供者為 null,則會使用 CurrentCultureIf the provider is null, the CurrentCulture is used.

(繼承來源 ImageSource)
VerifyAccess()

請強制執行可以存取這個 DispatcherObject 的呼叫執行緒。Enforces that the calling thread has access to this DispatcherObject.

(繼承來源 DispatcherObject)
WritePostscript()

引發 FreezableChanged 事件,並叫用其 OnChanged() 方法。Raises the Changed event for the Freezable and invokes its OnChanged() method. 在任何 API 修改未以相依性屬性儲存的類別成員之後,衍生自 Freezable 的類別應該在 API 的結尾呼叫這個方法。Classes that derive from Freezable should call this method at the end of any API that modifies class members that are not stored as dependency properties.

(繼承來源 Freezable)
WritePreamble()

確認 Freezable 未凍結,而且是從有效的執行緒內容進行存取。Verifies that the Freezable is not frozen and that it is being accessed from a valid threading context. 在任何 API 將資料寫入至非相依性屬性的資料成員之前,Freezable 繼承者應該在 API 的開頭呼叫這個方法。Freezable inheritors should call this method at the beginning of any API that writes to data members that are not dependency properties.

(繼承來源 Freezable)

事件

Changed

發生於 Freezable 或所含的物件遭到修改時。Occurs when the Freezable or an object it contains is modified.

(繼承來源 Freezable)
DecodeFailed

當影像因影像標頭損毀而無法載入時發生。Occurs when the image fails to load, due to a corrupt image header.

DownloadCompleted

點陣圖內容下載完成時發生。Occurs when the bitmap content has been completely downloaded.

DownloadFailed

無法下載點陣圖內容時發生。Occurs when the bitmap content failed to download.

DownloadProgress

點陣圖內容的下載進度變更時發生。Occurs when the download progress of the bitmap content has changed.

明確介面實作

IFormattable.ToString(String, IFormatProvider)

使用指定的格式,格式化目前執行個體的值。Formats the value of the current instance using the specified format.

(繼承來源 ImageSource)

適用於

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