From URI to Image in .NET

Question

I\'ve a URI like this one data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBzdGFuZGFsb25lPSJubyI/PjwhRE9DVFlQRSBzdmcgUFVCTElDI ..... on my web client and what I\

Answer 1

Just remove the beginning portion of the string "data:image/svg+xml;base64," everything after the comma is the actual base64 image, and you can save that image in .NET like this:

var bytes = Convert.FromBase64String(base64string);
using (var img = new FileStream(filePath, FileMode.Create))
{
    img.Write(bytes ,0, bytes.Length);
    img.Flush();
}

To help further clarify:

    class Program
    {
        static void Main(string[] args)
        {
            string b64 = "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";
            ImageFromBase64(b64);
        }

        public static  void ImageFromBase64(string base64Img)
        {
            var bytes = Convert.FromBase64String(base64Img);
            using (var img = new FileStream(@"result.svg", FileMode.Create))
            {
                img.Write(bytes, 0, bytes.Length);
                img.Flush();
            }
        }
    }

and the resulting result.svg:

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" id="Layer_1" x="0px" y="0px" viewBox="5.0 -10.0 100.0 135.0" enable-background="new 0 0 100 100" xml:space="preserve" height="100px" width="100px">
<path id="path1983_3_" d="M50.1,4.9v7.4c0,0,0,0-0.2,0c-0.1,0-0.4,0.2-0.4,0.4c0,0.2,0,5.1,0,5.3c0,0.2-0.2,0.2-0.2,0.4  c0,0.2,0,4.6,0,4.8s-0.2,0.2-0.2,0.4c0,0.2,0,1.7,0,1.7l-1.3,3.6c0,0-0.5,0-0.7,0c-0.2,0-0.4,0.2-0.4,0.4c0,0.2,0,0.9,0,0.9  s-0.4,0-0.5,0s-0.4,0.2-0.4,0.4c0,0.2,0,5.1,0,5.1s-0.4,0-0.5,0c-0.2,0-0.4,0.2-0.4,0.4c0,0.2,0,6,0,6.2c0,0.3-0.6,0.4-0.6,0.6  c0,0.2,0,30,0,30s-0.7,0-0.9,0c-0.2,0-0.4,0.2-0.4,0.4c0,0.2,0,6.6,0,6.6s-1.8,0-2,0c-0.2,0-0.4,0.2-0.4,0.4c0,0.2,0,9.9,0,9.9  s-2.6,0-2.8,0s-0.4,0.2-0.4,0.4c0,0.2,0,4.5,0,4.5h25.9c0,0,0-4.3,0-4.5c0-0.2-0.2-0.4-0.4-0.4c-0.2,0-2.8,0-2.8,0s0-9.7,0-9.9  c0-0.2-0.2-0.4-0.4-0.4c-0.2,0-2,0-2,0s0-6.4,0-6.6c0-0.2-0.2-0.4-0.4-0.4c-0.2,0-0.9,0-0.9,0s0-29.8,0-30c0-0.2-0.6-0.3-0.6-0.6  c0-0.3,0-6.1,0-6.2c0-0.2-0.2-0.4-0.4-0.4c-0.2,0-0.5,0-0.5,0s0-5,0-5.1c0-0.2-0.2-0.4-0.4-0.4c-0.2,0-0.6,0-0.6,0s0-0.7,0-0.9  c0-0.2-0.2-0.4-0.4-0.4c-0.2,0-0.7,0-0.7,0l-1.3-3.6c0,0,0-1.5,0-1.7c0-0.2-0.2-0.2-0.2-0.4s0-4.6,0-4.8c0-0.2-0.2-0.2-0.2-0.4  c0-0.2,0-5.1,0-5.3c0-0.2-0.2-0.4-0.4-0.4s-0.2,0-0.2,0V4.9h-0.4h-0.1H50.1z"/>
<text x="0.0" y="117.5" font-size="5.0" font-weight="bold" font-family="Helvetica Neue, Helvetica, Arial-Unicode, Arial, Sans-serif" fill="#000000">Created by Lazar Nikolic</text><text x="0.0" y="122.5" font-size="5.0" font-weight="bold" font-family="Helvetica Neue, Helvetica, Arial-Unicode, Arial, Sans-serif" fill="#000000">from the Noun Project</text></svg>

If you want a png you can use Inkscape.

Here is a link to a tutorial: http://www.31a2ba2a-b718-11dc-8314-0800200c9a66.com/2012/09/how-to-convert-svg-data-to-png-image.html