WPF 解決Image控件讀取高分辨率圖檔并縮放占用記憶體過大

需求:讀取高分辨率圖檔顯示到寬度為200的Image控件上

核心代碼:

private BitmapImage ReadImageFiletToBinary(string fileName)

{

using (var stream = new FileStream(fileName, FileMode.Open))

var bitmapImage = new BitmapImage();

bitmapImage.BeginInit();

bitmapImage.CacheOption = BitmapCacheOption.OnLoad;

int streamLen = (int)stream.Length;

byte[] imageData = new byte[stream.Length];

stream.Read(imageData, 0, streamLen);

bitmapImage.StreamSource = new MemoryStream(imageData, 0, streamLen);

bitmapImage.DecodePixelWidth = 200; //設定解碼後圖像的寬度，圖像變小，解析變快

bitmapImage.EndInit();

return bitmapImage;

}

這樣占用的記憶體很低,原本直接讀取10幾張圖需要占用150M記憶體,現在隻需不到5M