需要使用带有C＃的asp.net将所有图像类型转换为JPEG [英] Need to convert all image types to JPEG using asp.net with C#

问题描述

大家好，







我目前的要求是我需要转换（* .tif ，* .png，*。位图和* .gif）图片类型在上传时需要使用带有C＃技术的asp.net转换为JPEG类型..







任何人都可以分享相关事宜的代码或链接。





请帮忙...





提前致谢，

Subbu

Hi All,



I my current requirement i need to convert (*.tif,*.png,*.bitmap and *.gif)pictures type while uploading need to convert to JPEG type using the asp.net with C# technologies..



Can any body share the code or links for the subjected matter.


Kindly help on this..


Thanks in advance,
Subbu

推荐答案

您无法在上传过程中转换它们。您必须让用户上传图像文件，然后您可以尝试将其加载到Bitmap对象中并以新格式重新保存图像。



I'ved使用类似于此的代码来执行您之前描述的内容：

You cannot convert them during the upload. You have to let the user upload the image file, then you can try to load it into a Bitmap object and resave the image in a new format.

I'ved used code similar to this to do what you're describing before:

public static class ImageExtensions
{

    public static byte[] ToByteArray(this Bitmap sourceImage, ImageFormat format)
    {
        if (sourceImage == null)
            return null;

        using (MemoryStream targetStream = new MemoryStream())
        {
            sourceImage.Save(targetStream, format);
            targetStream.Close();

            return targetStream.ToArray();
        }
    }

    public static Bitmap ToBitmap(this byte[] bytes)
    {
        if (bytes == null)
            return (Bitmap)null;

        using (MemoryStream targetStream = new MemoryStream(bytes))
        {
            return new Bitmap(targetStream);
        }
    }

}

您可以将Bitmap转换为任意字节数组你想要的图像格式。然后将数组转换回Bitmap是一件简单的事情。

You can convert a Bitmap to an array of bytes in any image format you want. Then it's a simple matter to convert the array back to a Bitmap.

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