C# 使用BitmapFrame快速获取图像尺寸和分辨率

public void getImg(string filename, out Size JpgSize, out float Wpx, out float Hpx)
{
		try
		{
			Uri url = new Uri(filename);
			BitmapFrame bi = BitmapFrame.Create(url, BitmapCreateOptions.IgnoreColorProfile, BitmapCacheOption.OnDemand);
			int w = bi.PixelHeight;
			int h = bi.PixelWidth;
			JpgSize = new Size(w, h);
			Wpx = (float)bi.DpiX;//分辨率
			Hpx = (float)bi.DpiY;//分辨率
		}
		catch
		{
			JpgSize = new Size(0, 0);
			Wpx = 0; Hpx = 0;
		}
 }