[英]How to free image cache/memory in Windows Phone 8?
在我的Windows Phone 8應用程序中,我有一個帶有LongListSelector
的頁面,該頁面綁定到1000個對象的列表,這些對象具有base64string
的屬性。 現在要顯示圖像,我編寫了此轉換器以將bas64string
轉換為stream
。
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if (!value.ToString().Contains("http://"))
{
string str = value.ToString();
byte[] bytes = Converter.FromBase64String(str);
using (MemoryStream stream = new MemoryStream(bytes))
{
stream.Seek(0, SeekOrigin.Begin);
BitmapImage image = new BitmapImage();
image.SetSource(stream);
bytes = null;
var memoryusage = string.Format("Memory: {0} bytes",
DeviceExtendedProperties.GetValue("ApplicationCurrentMemoryUsage"));
Debug.WriteLine(memoryusage);
return image;
}
}
else
{
return null;
}
}
這是記憶的用法:
Memory: 92549120 bytes Memory: 92946432 bytes Memory: 92946432 bytes Memory: 92946432 bytes Memory: 92946432 bytes Memory: 93192192 bytes Memory: 93192192 bytes Memory: 96079872 bytes Memory: 100700160 bytes Memory: 100700160 bytes Memory: 109568000 bytes Memory: 111734784 bytes Memory: 142852096 bytes Memory: 143056896 bytes Memory: 143056896 bytes Memory: 143261696 bytes Memory: 140791808 bytes Memory: 141103104 bytes Memory: 141529088 bytes Memory: 142151680 bytes Memory: 146784256 bytes Memory: 146784256 bytes Memory: 155066368 bytes Memory: 156368896 bytes
當內存等於或可能大於此156368896字節的某個字節時,應用程序將由於EngineExecutionException
崩潰。 一旦我得到“ OutOfMemoryException”:
image.SetSource(stream);
顯然,這是一個內存問題。 我需要清除圖像緩存,但是如何清除? 我在此答案中看到了鏈接https://stackoverflow.com/a/12267163/1949475 ,但是我無法使用它。
注意:並非所有圖像都同時顯示,在我返回並再次返回頁面后,應用程序會占用大量內存,從而更改了要在LongListSelector中顯示的數據。
在轉換器類中進行設置很重要
BitmapImage image = new BitmapImage();
image.DecodePixelType = DecodePixelType.Logical;
image.CreateOptions = BitmapCreateOptions.BackgroundCreation;
image.CreateOptions = BitmapCreateOptions.DelayCreation;
image.DecodePixelWidth = 56;
image.DecodePixelHeight = 100;
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