本文实例为大家分享了c#实现上传下载图片的具体代码，供大家参考，具体内容如下
1.首先我们通过流来上传下载图片，所有操作只停留在流这一层
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memorystream ms; //左侧按钮 private void button1_click(object sender, eventargs e) { ms = new memorystream(); image bi =picturebox1.image; bi.save(ms, picturebox1.image.rawformat);//将图片存入流中 } //右侧按钮 private void button2_click(object sender, eventargs e) { image img = image.fromstream(ms, true); picturebox2.image = img; ms.close(); } |
分别点击左侧和右侧按钮，则将左侧图片加载到右侧：（picturebox的sizemode属性可以设置图片的填充方式）
2.通过将图片转化为流然后转化为字节；将字节转化为流，然后加载图片
图片转化为字节的代码：
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public static byte[] imgtobyte(image img, system.drawing.imaging.imageformat imgformat) { bitmap bmp = new bitmap(img); memorystream memstream = new memorystream(); bmp.save(memstream, imgformat); memstream.seek(0, seekorigin.begin); //及时定位流的开始位置 byte[] btimage = new byte[memstream.length]; memstream.read(btimage, 0, btimage.length); memstream.close(); return btimage; } |
字节转化为图片的代码：
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public static image bytetoimg(byte[] btimage) { memorystream memstream = new memorystream(); //stream memstream = null; memstream.write(btimage, 0, btimage.length); memstream.position = 0; memstream.seek(0, seekorigin.begin); //bitmap bmp = new bitmap(memstream, true); image img; try { img = image.fromstream(memstream, true); memstream.close(); //img = new bitmap(memstream); } catch (exception ex) { img = null; messagebox.show(ex + ""); } finally { memstream.close(); } return img;} |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/ClearLoveQ/article/details/81112994
