How can I convert emoji to hex in vb.net or C#? (I've included a working example in Javascript)

Hi experts!

I'm looking to convert input that contains emoji to show an image for the emoji based on the hex code. I've done this in Javascript using this source as a reference, though now I'm looking to do the same in C# or vb.net.

Here's what works in Javascript:
function displayEmoji(sInput) {
    var output = '';
    var chunks = sInput.split(/([\uD800-\uDBFF][\uDC00-\uDFFF])/);
    for (var i = 0, l = chunks.length; i < l; i++) {
        if (i % 2 == 0) {
            // Even-numbered chunks are plain text
            output = output + chunks[i];
        }
        else {
            // Odd-numbered chunks are surrogate pairs
            // We have TWO characters, but we want one codepoint; this is how you decode UTF-16
            var pair = chunks[i];
            var codepoint = (
                0x10000
                | ((pair.charCodeAt(0) - 0xD800) << 10)
                | (pair.charCodeAt(1) - 0xDC00)
            );
            var hex = codepoint.toString(16);  // now it's in hex
            output = output + "<img src=\"" + "https://abs.twimg.com/emoji/v1/72x72/" + hex + ".png\" style=\"height:1.5em; width:1.5em;\">";
        }
    }
    return output;
}

Open in new window


Can you show me how to do this in C# or Vb.net? You're help is greatly appreciated!
DrevoAsked:
Who is Participating?

Improve company productivity with a Business Account.Sign Up

x
 
louisfrConnect With a Mentor Commented:
Here is C# code to replace the surrogate pairs with an image:
string DisplayEmoji(string input)
{
    StringBuilder output = new StringBuilder();
    var enumerator = StringInfo.GetTextElementEnumerator(input);
    while(enumerator.MoveNext()){
        string chunk = enumerator.GetTextElement();
        if (char.IsSurrogatePair(chunk, 0))
            output.Append("<img src=\"" + "https://abs.twimg.com/emoji/v1/72x72/" + char.ConvertToUtf32(chunk, 0).ToString("x") + ".png\" style=\"height:1.5em; width:1.5em;\">");
        else
            output.Append(chunk);
    }
    return output.ToString();
}

Open in new window

1
 
DrevoAuthor Commented:
This is perfect! You made my day! Thanks.
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.