unicode - Return code point of characters in C#

Question

How can I return the Unicode Code Point of a character? For example, if the input is "A", then the output should be "U+0041". Ideally, a solution should take care of surrogate pairs.

With code point I mean the actual code point according to Unicode, which is different from code unit (UTF8 has 8-bit code units, UTF16 has 16-bit code units and UTF32 has 32-bit code units, in the latter case the value is equal to the code point, after taking endianness into account).

Answer 1

The following code writes the codepoints of a string input to the console:

string input = "uD834uDD61";

for (var i = 0; i < input.Length; i += char.IsSurrogatePair(input, i) ? 2 : 1)
{
    var codepoint = char.ConvertToUtf32(input, i);

    Console.WriteLine("U+{0:X4}", codepoint);
}

Output:

U+1D161

Since strings in .NET are UTF-16 encoded, the char values that make up the string need to be converted to UTF-32 first.