删除窗口的背景图片WPF [英] Deleting a window's background image WPF
问题描述
我有在WPF一个问题，即一个窗口不会释放它的背景图像文件的文件锁关闭之前，应用程序的其它部分后试图写入图像。
I'm having a problem in WPF where a window doesn't release it's file-lock on the background image file after closing, before another part of the application tries to write to the image.
因此，作为一个例子;说我有包括3个窗口，1菜单选择窗口，2人一个WPF应用程序。同时在Windows中创建一个的ImageBrush 使用的BitmapImage 为的ImageSource （中的相同的图片）。
So as an example; say I have a WPF app consisting of 3 windows, 1 "menu" selection window and 2 others. Both of the windows create an ImageBrush using a BitmapImage as the ImageSource (the same image).
窗口A有一个按钮，当pressed，通过复制他们每个人在作为原始文件的ImageSource 并创建一个新通过可用的背景图像周期的ImageBrush 并设置 Window.Background 新刷。
Window A has a button that when pressed, cycles through the available background images by copying them each over the file used as the original ImageSource and creating a new ImageBrush and setting the Window.Background to the new brush.
窗口B中只使用的ImageBrush 来绘制 Window.Background 。
Window B simply uses the ImageBrush to draw the Window.Background.
如果窗口A启动，背景切换，关闭，然后窗口B中推出，一切都很好。
If Window A is launched, backgrounds switched, closed and then Window B launched, everything is fine.
如果窗口B被启动，关闭，则窗口A启动并切换背景崩溃。尝试切换背景抛出 IOException异常，因为：
If Window B is launched, closed, then Window A is launched and backgrounds switched it crashes. Trying to switch the backgrounds throws an IOException because:
该进程无法访问文件C：\\ \\背景Background.png'。因为它正被另一个进程使用
"The process cannot access the file 'C:\Backgrounds\Background.png' because it is being used by another process."
因此窗口B中仍然必须以某种方式持有到它！？我试图做一个 GC.Collect的（）; GC.WaitForPendingFinalizers（）; ，看看是否能治愈的问题，但它没有。
So Window B must still be holding onto it somehow!? I have tried doing a GC.Collect(); GC.WaitForPendingFinalizers(); to see if that cures the problem but it doesn't.
推荐答案
托马斯给出的答案是正确的，效果很好，如果你有一个文件路径，不想缓存的位图，并且不希望使用XAML。
The answer Thomas gave is correct, and works well if you have a file path, don't want to cache the bitmap, and don't want to use XAML.
但是它也应该提到，BitmapImage的具有一个内置的方式来通过设置BitmapCacheOption立即加载位图：
However it should also be mentioned that BitmapImage has a built-in way to load the bitmap immediately by setting BitmapCacheOption:
BitmapImage img = new BitmapImage { CacheOption = BitmapCacheOption.OnLoad };
img.BeginInit();
img.UriSource = imageUrl;
img.EndInit();
或
<BitmapImage CacheOption="OnLoad" UriSource="..." />
这将立即载入位图，并明确关闭流，就像使用FileStream会，但有几个不同点：
This will load the bitmap immediately and explicitly close the stream, just as using a FileStream would, but with several differences:
- 将与任何开放的工作，如包：//乌里
- 可以直接从XAML使用
- 将位图中的位图缓存中，同一个URI，所以未来使用不会去磁盘。在您的特定应用，这可能是一件坏事，但对其他使用它可能是一个可取的特点。
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