TidyManaged encoding can not support GBK or GB2312

[garysun90]

if I input chinese characters,it will output ???.

  using (Document doc = Document.FromString("已完成，请查看"))
        {
            doc.ShowWarnings = false;
            doc.Quiet = true;
            doc.OutputXhtml = true;
            doc.CleanAndRepair();
            parsed = doc.Save();
            Console.WriteLine(parsed);
        }

[garysun90]

I have got a solution. modify save function and CleanAndRepair which in Document class.
///

/// Parses input markup, and executes configured cleanup and repair operations.
///

public void CleanAndRepair()
{
if (fromString)
{
EncodingType tempEnc = this.InputCharacterEncoding;
this.InputCharacterEncoding = EncodingType.Big5;
PInvoke.tidyParseString(this.handle, this.htmlString);
this.InputCharacterEncoding = tempEnc;
}
else
{
InputSource input = new InputSource(this.stream);
PInvoke.tidyParseSource(this.handle, ref input.TidyInputSource);
}
PInvoke.tidyCleanAndRepair(this.handle);
cleaned = true;
}

	/// <summary>
	/// Saves the processed markup to a string.
	/// </summary>
	/// <returns>A string containing the processed markup.</returns>
	public string Save()
	{
		if (!cleaned)
			throw new InvalidOperationException("CleanAndRepair() must be called before Save().");
		var tempEnc = this.CharacterEncoding;
		var tempBOM = this.OutputByteOrderMark;
		this.OutputCharacterEncoding = EncodingType.Utf8;
		this.OutputByteOrderMark = AutoBool.No;

		uint bufferLength = 1;
		byte[] htmlBytes;
		GCHandle handle = new GCHandle();
		do
		{
			// Buffer was too small - bufferLength should now be the required length, so try again...
			if (handle.IsAllocated) handle.Free();

			// this setting appears to be reset by libtidy after calling tidySaveString; we need to set it each time
			this.OutputCharacterEncoding = EncodingType.Big5;

			htmlBytes = new byte[bufferLength];
			handle = GCHandle.Alloc(htmlBytes, GCHandleType.Pinned);
		} while (PInvoke.tidySaveString(this.handle, handle.AddrOfPinnedObject(), ref bufferLength) == -12);

		handle.Free();

		this.OutputCharacterEncoding = tempEnc;
		this.OutputByteOrderMark = tempBOM;
		return Encoding.GetEncoding("GB2312").GetString(htmlBytes);
	}