BitmapImage集合内存管理 [英] BitmapImage Collection Memory Management

问题描述

让我们创建一个:

Hi,

Let''s create a:

ObservableCollection<BitmapImage> BitmapsLists = new ObservableCollection<BitmapImage>();

然后让我们用一些随机图像填充它:

Then let''s fill it with some random Images:

foreach (string item in Directory.GetFiles("Some Folder"))
{
    BitmapImage BitImage = new BitmapImage();
    BitImage.BeginInit();
    BitImage.CacheOption = BitmapCacheOption.None;
    BitImage.UriSource = new Uri(item);
    BitImage.EndInit();
    BitImage.Freeze();
    BitmapsLists.Add(BitImage);
}

直到这之前检查内存消耗，我们几乎不会注意到10Mb，也许更少..
(我目前正在处理50个约500 Kb的信号).

之后，让我们将位图与画布上的某些ImageSource(控件)链接起来.

Checking the memory consuption till this we will notice hardly 10Mb, maybe less..
(I am currently dealing with 50 Jpgs around 500Kb each).

After this let''s link out Bitmaps with some ImageSources of Image(controls) on a Canvas.

foreach (BitmapImage item in BitmapsLists)
{
    Image myImage = new Image();
    myImage.source = item;
    // Then add it to Canvas Children setting Left and Top Property and calling the add function.
}

您会注意到，完成此操作后，我们将消耗大约500Mb的内存.

很好..

现在，让我们清除所有ImageSource:

You will notice that when this finishes we will have around 500Mb of memory consumption.

Fine..

Now let''s clear all of our ImageSources:

foreach (Image item in Canvas.Children)
{
    item.source = null;
}

好..
现在，让我们清理孩子并使用
强制重新渲染 -> InvalidateVisual(); //就像我记得的那样..

Good..
Now let''s clear our Children and force a ReRendering with
--> InvalidateVisual(); // Not Needed as i recall..

Canvas.Children.Clear;
InvalidateVisual();

好吧，现在为什么我仍然有500MB的RAM被占用..?

我没有更多的引用，并且BitmapImages仅位于集合中..
什么都没画...！

*代码块上的代码可能有一些错误，这台电脑上没有编译器..

///更新1:

阅读以下内容后，也可以尝试StreamSource: http ://stackoverflow.com/questions/1684489/how-do-you-make-sure-wpf-releases-large-bitmapsource-from-memory [

Ok now why i still have 500MB of RAM still Being occupied..?

I have no more References and the BitmapImages are only laying into the Collection..
Nothing is being drawed...!

*Code on codeblocks may have some mistakes no compiler on this pc..

/// Update 1:

Just tryed also the StreamSource after reading this : http://stackoverflow.com/questions/1684489/how-do-you-make-sure-wpf-releases-large-bitmapsource-from-memory[^]

Still no luck..!

推荐答案

我找到了..
我将发布解决方案l8
---------------------------------

即使您将BitmapCacheOption设置为任何值，仅仅因为您使用Uri作为源创建BitmapImage并不意味着它是在同时创建的..

当您将BitmapImage用作Image之类的控件中的Source时，它将被加载到内存中.

另外，我发现立即加载位图的唯一方法是将其StreamSource设置为Stream BUT，但要小心设置"source.CacheOption = BitmapCacheOption.OnLoad;"

示例如下:

I found it..
I''ll post the solution l8
---------------------------------

Just Because you create a BitmapImage using a Uri as source doesn''t mean that it it being created at the same time even if you set the BitmapCacheOption to whatever value..

The BitmapImage is gonna get Loaded into memory when you use it as Source in a Control like Image.

Additionally the only way i''ve found to load the Bitmap instantly is to set its StreamSource to a Stream BUT be carefull to also set the "source.CacheOption = BitmapCacheOption.OnLoad;"

The example is this:

var source = new BitmapImage();
using(Stream stream = ...)
{
  source.BeginInit();
  source.StreamSource = stream;
  source.CacheOption = BitmapCacheOption.OnLoad;
  source.EndInit();
}

学分归Ray Burns所有
来自 http://stackoverflow.com/questions /1684489/how-do-you-make-sure-wpf-releases-large-bitmapsource-from-memory [

And the credits go to Ray Burns
from http://stackoverflow.com/questions/1684489/how-do-you-make-sure-wpf-releases-large-bitmapsource-from-memory[^].

尝试一下

Try this

GC.Collect();

GC.Collect方法 [

GC.Collect Method [^]

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