How to convert Quoted-Print String

Question

I\'m working on French String in .NET Decoding a Mail body , I receive \"Chasn=C3=A9 sur illet\" I would like to get \"Chasné sur illet\" and i don\'t find any solution ave

Answer 1

From : https://stackoverflow.com/a/36803911/6403521 My solution :

    [TestMethod]
    public void TestMethod1()
    {

        Assert.AreEqual("La Bouichère", quotedprintable("La Bouich=C3=A8re", "utf-8"));
        Assert.AreEqual("Chasné sur illet", quotedprintable("Chasn=C3=A9 sur illet", "utf-8"));
        Assert.AreEqual("é è", quotedprintable("=C3=A9 =C3=A8", "utf-8"));
    }
    private string quotedprintable(string pStrIn, string encoding)
    {
        String strOut = pStrIn.Replace("=\r\n", "");
        // Find the first =
        int position = strOut.IndexOf("=");
        while (position != -1)
        { 
            // String before the =
            string leftpart = strOut.Substring(0, position);
            // get the QuotedPrintable String in a ArrayList
            System.Collections.ArrayList hex = new System.Collections.ArrayList();
            // The first Part
            hex.Add(strOut.Substring(1 + position, 2));
            // Look for the next parts
            while (position + 3 < strOut.Length && strOut.Substring(position + 3, 1) == "=")
            {
                position = position + 3;
                hex.Add(strOut.Substring(1 + position, 2));
            }
            // In the hex Array, we have two items 
            // Convert using the GetEncoding Function
            byte[] bytes = new byte[hex.Count];
            for (int i = 0; i < hex.Count; i++)
            {
                bytes[i] = System.Convert.ToByte(new string(((string)hex[i]).ToCharArray()), 16);
            }
            string equivalent = System.Text.Encoding.GetEncoding(encoding).GetString(bytes);
            // Part of the orignal String after the last QP Symbol
            string rightpart = strOut.Substring(position + 3);
            // Re build the String
            strOut = leftpart + equivalent + rightpart;
            // find the new QP Position
            position = leftpart.Length + equivalent.Length;
            if (rightpart.Length == 0)
            {
                position = -1;
            }
            else
            {
                position = strOut.IndexOf("=", position + 1);
            }
        }
        return strOut;
    }