IconBitmapDecoder 建構函式

定義

命名空間:

System.Windows.Media.Imaging

組件:

PresentationCore.dll

初始化 IconBitmapDecoder 類別的新執行個體。

多載

名稱	Description
IconBitmapDecoder(Stream, BitmapCreateOptions, BitmapCacheOption)	從指定的檔案串流初始化該類別的新實例IconBitmapDecoder，並指定createOptionscacheOption為 。
IconBitmapDecoder(Uri, BitmapCreateOptions, BitmapCacheOption)	初始化該類別的新實例IconBitmapDecoder，來自指定的 Uri，並指定createOptionscacheOption為 。

IconBitmapDecoder(Stream, BitmapCreateOptions, BitmapCacheOption)

從指定的檔案串流初始化該類別的新實例IconBitmapDecoder，並指定createOptionscacheOption為 。

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);

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)

參數

bitmapStream

Stream

要解碼的點陣圖串流。

createOptions

BitmapCreateOptions

點陣圖影像的初始化選項。

cacheOption

BitmapCacheOption

用於點陣圖影像的快取方法。

例外狀況

ArgumentNullException

bitmapStream 值是 null。

FileFormatException

這 bitmapStream 不是圖示編碼的影像。

範例

以下程式碼範例示範如何從檔案串流建立並使用 a GifBitmapDecoder 實例。

// 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)

備註

如果你想在點陣圖建立後關閉，OnLoad可以使用bitmapStream快取選項。 預設 OnDemand 快取選項保留對串流的存取權，直到需要位圖，且垃圾回收器負責清理。

IconBitmapDecoder(Uri, BitmapCreateOptions, BitmapCacheOption)

初始化該類別的新實例IconBitmapDecoder，來自指定的 Uri，並指定createOptionscacheOption為 。

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);

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)

參數

bitmapUri

Uri

那 Uri 個用來識別要解碼的位圖。

createOptions

BitmapCreateOptions

點陣圖影像的初始化選項。

cacheOption

BitmapCacheOption

用於點陣圖影像的快取方法。

例外狀況

ArgumentNullException

bitmapUri 值是 null。

FileFormatException

這 bitmapUri 不是圖示編碼的影像。

範例

以下程式碼範例示範如何從 中建立 的實例並使用 a GifBitmapDecoderUri。

// 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)