check if string is encoded in UTF-8

Question

I want to check the encoding in a string with C#.

Is there any possible way?

I was trying with StreamReader but I don't have path.

foreach (string um in userMasterList)
{
    counter++;
    TextInfo textInfo = new CultureInfo("en-US", false).TextInfo;
    string finalName = null;

    if (!string.IsNullOrEmpty(um))
    {
        //string str =  StreamReader.CurrentEncoding.ToString();
        string Name = um.Trim();
        //StreamReader sr = new StreamReader(Name);
        // MessageBox.Show(sr.CurrentEncoding.ToString());
        if (!Regex.IsMatch(Name, "^[a-zA-Z0-9]*$"))
        {
            finalName = GreekToLower(Name);
            finalName = textInfo.ToTitleCase(finalName);
        }
        else
        {
            finalName = textInfo.ToTitleCase(Name.ToLower());
        }
        finalList.Add(finalName);
    }
    else
    {
        finalList.Add("-");
    }
}

Answer 1

My Code:

public static bool IsOnlyUTF8(string value)
{
    byte[] bytes = value.ToCharArray()
                        .Select(c => (byte)c)
                        .ToArray();
    string decodedString = System.Text.Encoding.UTF8.GetString(bytes);

    return value.Equals(decodedString);
}

Answer 2

Not sure whether this will answer your question:

 public static bool CheckEncoding(string value, Encoding encoding)
 {
     bool retCode;
     var charArray = value.ToCharArray();
     byte[] bytes = new byte[charArray.Length];
     for (int i = 0; i < charArray.Length; i++)
     {
         bytes[i] = (byte)charArray[i];
     }
     retCode = string.Equals(encoding.GetString(bytes, 0, bytes.Length), value, StringComparison.InvariantCulture);
     return retCode;
}

Calling Code:

CheckEncoding("Prüfung", Encoding.ASCII); //false