Question

How to check if an array of bytes is a valid UTF-8 string in C#

Answer 1

using System;
using System.Text;

public class Program
{
    static bool IsValidUTF8(byte[] s) {
        var encoding = new UTF8Encoding(false, true);
        
        try {
            encoding.GetCharCount(s);
        }
        catch (DecoderFallbackException) {
            return false;
        }
            
        return true;
    }
        
    public static void Main(string[] args)
    {
        byte[] arr1 = Encoding.UTF8.GetBytes("Hello, 世界");
        byte[] arr2 = { 0xa3, 0xed, 0xfd };

        Console.WriteLine(IsValidUTF8(arr1));
        Console.WriteLine(IsValidUTF8(arr2));
    }
}


/*
run:

True
False

*/

 

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