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();
}
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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;
}
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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;
}
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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