TransformedBitmap.BeginInit 方法

定义

命名空间:

System.Windows.Media.Imaging

程序集:

PresentationCore.dll

用信号通知 TransformedBitmap 初始化开始。

public:
 virtual void BeginInit();

public void BeginInit ();

abstract member BeginInit : unit -> unit
override this.BeginInit : unit -> unit

Public Sub BeginInit ()

实现

BeginInit()

例外

InvalidOperationException

TransformedBitmap 当前正被初始化。 已调用 BeginInit()。

- 或 -

TransformedBitmap 已初始化。

示例

以下示例演示如何使用 BeginInit 和 EndInit 方法使用一组属性初始化 TransformedBitmap 。

// Create the new BitmapSource that will be used to scale the size of the source.
TransformedBitmap myRotatedBitmapSource = new TransformedBitmap();

// BitmapSource objects like TransformedBitmap can only have their properties
// changed within a BeginInit/EndInit block.
myRotatedBitmapSource.BeginInit();

// Use the BitmapSource object defined above as the source for this BitmapSource.
// This creates a "chain" of BitmapSource objects which essentially inherit from each other.
myRotatedBitmapSource.Source = myBitmapImage;

// Flip the source 90 degrees.
myRotatedBitmapSource.Transform = new RotateTransform(90);
myRotatedBitmapSource.EndInit();

' Create the new BitmapSource that will be used to scale the size of the source.
Dim myRotatedBitmapSource As New TransformedBitmap()

' BitmapSource objects like TransformedBitmap can only have their properties
' changed within a BeginInit/EndInit block.
myRotatedBitmapSource.BeginInit()

' Use the BitmapSource object defined above as the source for this BitmapSource.
' This creates a "chain" of BitmapSource objects which essentially inherit from each other.
myRotatedBitmapSource.Source = myBitmapImage

' Flip the source 90 degrees.
myRotatedBitmapSource.Transform = New RotateTransform(90)
myRotatedBitmapSource.EndInit()

注解

属性初始化必须在 和 EndInit 调用之间BeginInit完成。 TransformedBitmap初始化 后，将忽略属性更改。

另请参阅

• EndInit()
• ISupportInitialize