C# 在 .Net 2.0 中读取 PNG 图像文件
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Reading a PNG image file in .Net 2.0
提问by Roy Tang
I'm using C# in .Net 2.0, and I want to read in a PNG image file and check for the first row and first column that has non-transparent pixels.
我在 .Net 2.0 中使用 C#，我想读取一个 PNG 图像文件并检查具有非透明像素的第一行和第一列。
What assembly and/or class should I use?
我应该使用什么程序集和/或类？
采纳答案by Pavel Chuchuva
回答by Roy Tang
Of course I googled already and found the PngBitmapDecoder class, but it doesn't seem to be available in .Net 2.0?
当然，我已经用谷歌搜索并找到了 PngBitmapDecoder 类，但它似乎在 .Net 2.0 中不可用？
http://msdn.microsoft.com/en-us/library/system.windows.media.imaging.pngbitmapdecoder.aspx
http://msdn.microsoft.com/en-us/library/system.windows.media.imaging.pngbitmapdecoder.aspx
The above link mentions it's in the PresentationCore assembly which I don't seem to have included with .Net 2.0
上面的链接提到它在 PresentationCore 程序集中，我似乎没有包含在 .Net 2.0 中
回答by ArekBulski
Well, Bitmap class can read a PNG file and access pixels. Can it see transparent pixels? PNG supports transparency while BMP does not. But still, it works.
好吧，Bitmap 类可以读取 PNG 文件并访问像素。它可以看到透明像素吗？PNG 支持透明度，而 BMP 不支持。但是，它仍然有效。
Bitmap bitmap = new Bitmap("icn_loading_animated3a.png");
pictureBox1.Image = bitmap;
Color pixel5by10 = bitmap.GetPixel(5, 10);
Code above read my little picture and then read a transparent pixel. Color class has RGBA values, and the pixel I read was in recognized as transparent.
上面的代码读取我的小图片，然后读取一个透明像素。颜色类具有 RGBA 值，我读取的像素被识别为透明。
