WPF Image动态加载图片终极办法

最新推荐文章于 2024-06-13 13:38:35 发布

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最新推荐文章于 2024-06-13 13:38:35 发布

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原文链接：http://www.cnblogs.com/leelike/archive/2012/03/27/2420149.html

本文介绍如何通过设置BitmapImage的DecodePixelWidth或DecodePixelHeight属性来减少WPF应用程序中的内存占用，确保图片按需加载并维持宽高比。

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//Createsource BitmapImagemyBitmapImage= new BitmapImage(); 
//BitmapImage.UriSourcemustbeinaBeginInit/EndInitblock 
myBitmapImage.BeginInit(); myBitmapImage.UriSource= new 
Uri(str,UriKind.Absolute); 
//Tosavesignificantapplicationmemory,settheDecodePixelWid

// Create source   
BitmapImage myBitmapImage = new BitmapImage();   
   
   
// BitmapImage.UriSource must be in a BeginInit/EndInit block   
myBitmapImage.BeginInit();   
myBitmapImage.UriSource = new Uri(str, UriKind.Absolute);   
   
   
// To save significant application memory, set the DecodePixelWidth or     
// DecodePixelHeight of the BitmapImage value of the image source to the desired    
// height or width of the rendered image. If you don't do this, the application will    
// cache the image as though it were rendered as its normal size rather then just    
// the size that is displayed.   
// Note: In order to preserve aspect ratio, set DecodePixelWidth   
// or DecodePixelHeight but not both.   
myBitmapImage.DecodePixelWidth = 2048;   
myBitmapImage.EndInit();   
//set image source   


Image img = new Image(); 
img.Source = myBitmapImage;

// Create source
BitmapImage myBitmapImage = new BitmapImage();


// BitmapImage.UriSource must be in a BeginInit/EndInit block
myBitmapImage.BeginInit();
myBitmapImage.UriSource = new Uri(str, UriKind.Absolute);


// To save significant application memory, set the DecodePixelWidth or
// DecodePixelHeight of the BitmapImage value of the image source to the desired
// height or width of the rendered image. If you don't do this, the application will
// cache the image as though it were rendered as its normal size rather then just
// the size that is displayed.
// Note: In order to preserve aspect ratio, set DecodePixelWidth
// or DecodePixelHeight but not both.
myBitmapImage.DecodePixelWidth = 2048;
myBitmapImage.EndInit();
//set image source

Image img = new Image();
img.Source = myBitmapImage;