CachedBitmap(BitmapSource, BitmapCreateOptions, BitmapCacheOption) 建構函式

定義

命名空間:

System.Windows.Media.Imaging

組件:

PresentationCore.dll

初始化已指定來源、點陣圖建立選項和點陣圖快取選項之 CachedBitmap 的新執行個體。

public:
 CachedBitmap(System::Windows::Media::Imaging::BitmapSource ^ source, System::Windows::Media::Imaging::BitmapCreateOptions createOptions, System::Windows::Media::Imaging::BitmapCacheOption cacheOption);

public CachedBitmap (System.Windows.Media.Imaging.BitmapSource source, System.Windows.Media.Imaging.BitmapCreateOptions createOptions, System.Windows.Media.Imaging.BitmapCacheOption cacheOption);

new System.Windows.Media.Imaging.CachedBitmap : System.Windows.Media.Imaging.BitmapSource * System.Windows.Media.Imaging.BitmapCreateOptions * System.Windows.Media.Imaging.BitmapCacheOption -> System.Windows.Media.Imaging.CachedBitmap

Public Sub New (source As BitmapSource, createOptions As BitmapCreateOptions, cacheOption As BitmapCacheOption)

參數

source

BitmapSource

正在快取的來源點陣圖。

createOptions

BitmapCreateOptions

點陣圖影像的初始化選項。

cacheOption

BitmapCacheOption

指定如何將點陣圖快取到記憶體。

例外狀況

ArgumentNullException

於 source 為 null 時發生。

範例

下列程式碼範例示範如何在程式碼中建立和使用 CachedBitmap 。

CachedBitmap cachedSource = new CachedBitmap(
    scaledSource, 
    BitmapCreateOptions.None,
    BitmapCacheOption.OnLoad);


// Create a new BitmapSource using a different format than the original one.
FormatConvertedBitmap newFormatSource = new FormatConvertedBitmap();
newFormatSource.BeginInit();
newFormatSource.Source = cachedSource;
newFormatSource.DestinationFormat = PixelFormats.Gray32Float;
newFormatSource.EndInit();

Dim cachedSource As New CachedBitmap(scaledSource, BitmapCreateOptions.None, BitmapCacheOption.OnLoad)
' Create a new BitmapSource using a different format than the original one.
Dim newFormatSource As New FormatConvertedBitmap()
newFormatSource.BeginInit()
newFormatSource.Source = cachedSource
newFormatSource.DestinationFormat = PixelFormats.Gray32Float
newFormatSource.EndInit()

另請參閱

• BitmapSource