IconBitmapDecoder 构造函数

定义

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

初始化 IconBitmapDecoder 类的新实例。

重载

IconBitmapDecoder(Stream, BitmapCreateOptions, BitmapCacheOption)

IconBitmapDecoder使用指定的createOptions和 cacheOption。

public:
 IconBitmapDecoder(System::IO::Stream ^ bitmapStream, System::Windows::Media::Imaging::BitmapCreateOptions createOptions, System::Windows::Media::Imaging::BitmapCacheOption cacheOption);
[System.Security.SecurityCritical]
public IconBitmapDecoder(System.IO.Stream bitmapStream, System.Windows.Media.Imaging.BitmapCreateOptions createOptions, System.Windows.Media.Imaging.BitmapCacheOption cacheOption);
public IconBitmapDecoder(System.IO.Stream bitmapStream, System.Windows.Media.Imaging.BitmapCreateOptions createOptions, System.Windows.Media.Imaging.BitmapCacheOption cacheOption);
[<System.Security.SecurityCritical>]
new System.Windows.Media.Imaging.IconBitmapDecoder : System.IO.Stream * System.Windows.Media.Imaging.BitmapCreateOptions * System.Windows.Media.Imaging.BitmapCacheOption -> System.Windows.Media.Imaging.IconBitmapDecoder
new System.Windows.Media.Imaging.IconBitmapDecoder : System.IO.Stream * System.Windows.Media.Imaging.BitmapCreateOptions * System.Windows.Media.Imaging.BitmapCacheOption -> System.Windows.Media.Imaging.IconBitmapDecoder
Public Sub New (bitmapStream As Stream, createOptions As BitmapCreateOptions, cacheOption As BitmapCacheOption)

参数

bitmapStream
Stream

要解码的位图流。

createOptions
BitmapCreateOptions

位图图像的初始化选项。

cacheOption
BitmapCacheOption

用于位图图像的缓存方法。

属性
SecurityCriticalAttribute

例外

ArgumentNullException

值为 bitmapStreamnull.

FileFormatException

不是 bitmapStream 图标编码的图像。

示例

下面的代码示例演示如何创建文件流中的实例并使用 GifBitmapDecoder 实例。


// Open a Stream and decode a GIF image
Stream^ imageStreamSource = gcnew FileStream("tulipfarm.gif", FileMode::Open, FileAccess::Read, FileShare::Read);
GifBitmapDecoder^ decoder = gcnew GifBitmapDecoder(imageStreamSource, BitmapCreateOptions::PreservePixelFormat, BitmapCacheOption::Default);
BitmapSource^ bitmapSource = decoder->Frames[0];

// Draw the Image
Image^ myImage = gcnew Image();
myImage->Source = bitmapSource;
myImage->Stretch = Stretch::None;
myImage->Margin = System::Windows::Thickness(20);


// Open a Stream and decode a GIF image
Stream imageStreamSource = new FileStream("tulipfarm.gif", FileMode.Open, FileAccess.Read, FileShare.Read);
GifBitmapDecoder decoder = new GifBitmapDecoder(imageStreamSource, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
BitmapSource bitmapSource = decoder.Frames[0];

// Draw the Image
Image myImage = new Image();
myImage.Source = bitmapSource;
myImage.Stretch = Stretch.None;
myImage.Margin = new Thickness(20);

' Open a Stream and decode a GIF image
Dim imageStreamSource As New FileStream("tulipfarm.gif", FileMode.Open, FileAccess.Read, FileShare.Read)
Dim decoder As New GifBitmapDecoder(imageStreamSource, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default)
Dim bitmapSource As BitmapSource = decoder.Frames(0)

' Draw the Image
Dim myImage As New Image()
myImage.Source = bitmapSource
myImage.Stretch = Stretch.None
myImage.Margin = New Thickness(20)

注解

OnLoad如果要在创建位图后关闭bitmapStream缓存选项，请使用缓存选项。 默认 OnDemand 缓存选项将保留对流的访问，直到需要位图并由垃圾回收器处理清理。

适用于

IconBitmapDecoder(Uri, BitmapCreateOptions, BitmapCacheOption)

IconBitmapDecoder用指定的UricreateOptions和 cacheOption。

public:
 IconBitmapDecoder(Uri ^ bitmapUri, System::Windows::Media::Imaging::BitmapCreateOptions createOptions, System::Windows::Media::Imaging::BitmapCacheOption cacheOption);
[System.Security.SecurityCritical]
public IconBitmapDecoder(Uri bitmapUri, System.Windows.Media.Imaging.BitmapCreateOptions createOptions, System.Windows.Media.Imaging.BitmapCacheOption cacheOption);
public IconBitmapDecoder(Uri bitmapUri, System.Windows.Media.Imaging.BitmapCreateOptions createOptions, System.Windows.Media.Imaging.BitmapCacheOption cacheOption);
[<System.Security.SecurityCritical>]
new System.Windows.Media.Imaging.IconBitmapDecoder : Uri * System.Windows.Media.Imaging.BitmapCreateOptions * System.Windows.Media.Imaging.BitmapCacheOption -> System.Windows.Media.Imaging.IconBitmapDecoder
new System.Windows.Media.Imaging.IconBitmapDecoder : Uri * System.Windows.Media.Imaging.BitmapCreateOptions * System.Windows.Media.Imaging.BitmapCacheOption -> System.Windows.Media.Imaging.IconBitmapDecoder
Public Sub New (bitmapUri As Uri, createOptions As BitmapCreateOptions, cacheOption As BitmapCacheOption)

参数

bitmapUri
Uri

用于 Uri 标识要解码的位图。

createOptions
BitmapCreateOptions

位图图像的初始化选项。

cacheOption
BitmapCacheOption

用于位图图像的缓存方法。

属性
SecurityCriticalAttribute

例外

ArgumentNullException

值为 bitmapUrinull.

FileFormatException

不是 bitmapUri 图标编码的图像。

示例

下面的代码示例演示如何创建一个实例并使用 GifBitmapDecoder a.Uri


// Open a Uri and decode a GIF image
System::Uri^ myUri = gcnew System::Uri("tulipfarm.gif", UriKind::RelativeOrAbsolute);
GifBitmapDecoder^ decoder2 = gcnew GifBitmapDecoder(myUri, BitmapCreateOptions::PreservePixelFormat, BitmapCacheOption::Default);
BitmapSource^ bitmapSource2 = decoder2->Frames[0];

// Draw the Image
Image^ myImage2 = gcnew Image();
myImage2->Source = bitmapSource2;
myImage2->Stretch = Stretch::None;
myImage2->Margin = System::Windows::Thickness(20);


// Open a Uri and decode a GIF image
Uri myUri = new Uri("tulipfarm.gif", UriKind.RelativeOrAbsolute);
GifBitmapDecoder decoder2 = new GifBitmapDecoder(myUri, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
BitmapSource bitmapSource2 = decoder2.Frames[0];

// Draw the Image
Image myImage2 = new Image();
myImage2.Source = bitmapSource2;
myImage2.Stretch = Stretch.None;
myImage2.Margin = new Thickness(20);

' Open a Uri and decode a GIF image
Dim myUri As New Uri("tulipfarm.gif", UriKind.RelativeOrAbsolute)
Dim decoder2 As New GifBitmapDecoder(myUri, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default)
Dim bitmapSource2 As BitmapSource = decoder2.Frames(0)

' Draw the Image
Dim myImage2 As New Image()
myImage2.Source = bitmapSource2
myImage2.Stretch = Stretch.None
myImage2.Margin = New Thickness(20)

适用于