十六进制字符串到unicode（中文或其他语言）C＃

Question

I can use UTF8 to convert But when I test Unicode, some characters will be lost, whether I have set errors

Please give me some advice

Chinese = "对我很有帮助" Lost display: "?我很有帮?"

 static void Main(string[] args)
        {
            String hex2 = "F95B1162885F09672E5EA9522100";
            String temp3 = Trans2(hex2);
            Console.WriteLine(temp3);
            Console.ReadLine();
        }
        public static string Trans(String input)
        {
            string temp1 = ConvertHexToString(input, System.Text.Encoding.UTF8);
            return temp1;

        }


        private static string ConvertHexToString(String hexInput, System.Text.Encoding encoding)
        {
            int numberChars = hexInput.Length;
            byte[] bytes = new byte[numberChars / 2];
            for (int i = 0; i < numberChars; i += 2)
            {
                bytes[i / 2] = Convert.ToByte(hexInput.Substring(i, 2), 16);
            }
            return encoding.GetString(bytes);
        }

Answer 1

I have tested your code but can't replicate your issue. It looks all fine on my environment. However, I do agree @grek40 about console encoding, or look into the font used in your console - is it capable to display these characters?

My test code is below, on a GUI application, probably you can try it out:

private static string ConvertHexToString(String hexInput, System.Text.Encoding encoding) {
    int numberChars = hexInput.Length;
    byte[] bytes = new byte[numberChars / 2];
    for (int i = 0; i < numberChars; i += 2) {
        bytes[i / 2] = Convert.ToByte(hexInput.Substring(i, 2), 16);
    }
    return encoding.GetString(bytes);
}

private static string ConvertStringToHex(String strInput, System.Text.Encoding encoding) {
    return BitConverter.ToString(encoding.GetBytes(strInput)).Replace("-", String.Empty);
}

private void button1_Click(object sender, EventArgs e) {
    string strTest = "对我很有帮助!";
    Debug.Print(strTest);

    string hex;

    hex = ConvertStringToHex(strTest, Encoding.UTF8);
    Debug.Print(hex);
    Debug.Print(ConvertHexToString(hex, Encoding.UTF8));

    hex = ConvertStringToHex(strTest, Encoding.Unicode);
    Debug.Print(hex);
    Debug.Print(ConvertHexToString(hex, Encoding.Unicode));

    Debug.Print(ConvertHexToString("F95B1162885F09672E5EA9522100", Encoding.Unicode));
}

The result is as follows:

对我很有帮助!
E5AFB9E68891E5BE88E69C89E5B8AEE58AA921
对我很有帮助!
F95B1162885F09672E5EA9522100
对我很有帮助!
对我很有帮助!

Apparently your hex string in sample code is in Unicode format.

PS: If your input is read from file, you need to think about if the file is encoded in big/small endian and whether BOM is used.