CachedBitmap(BitmapSource, BitmapCreateOptions, BitmapCacheOption) 构造函数

定义

命名空间:
System.Windows.Media.Imaging
程序集:
PresentationCore.dll

初始化具有指定源、位图创建选项和位图缓存选项的新实例 CachedBitmap 。

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)

参数

source
BitmapSource

正在缓存的源位图。

createOptions
BitmapCreateOptions

位图图像的初始化选项。

cacheOption
BitmapCacheOption

指定位图如何缓存到内存中。

例外

ArgumentNullException

当 source 为 null.

示例

下面的代码示例演示如何创建和使用代码中的代码 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()

适用于

另请参阅