How to catch the json format result in C#?

Hello:
I want to use C# to save all the voice recognized text in a file, so I can edit it later.
I found to use Console.WriteLine to show the result, for all NON-English text, the words look like garbage, but using Debug.WriteLine the shown text is correct. So I write some code trying to show NON-English text in debug output window. The following is my code:

public static void DemoBytes(Model model)
{
// Demo byte buffer
VoskRecognizer rec = new(model, 16000.0f);
rec.SetMaxAlternatives(0);
rec.SetWords(true);
using (Stream source = File.OpenRead(UA_Wav_File1))
{
byte[] buffer = new byte[4096];
int bytesRead;
while ((bytesRead = source.Read(buffer, 0, buffer.Length)) > 0)
{
if (rec.AcceptWaveform(buffer, bytesRead))
{
Console.WriteLine(rec.Result());
string json_data = rec.Result().ToString();
if (json_data.Contains("["))
{
Debug.WriteLine(json_data);
Console.Beep();
}
}
else
{
Console.WriteLine(rec.PartialResult());
}
}
}
Console.WriteLine(rec.FinalResult());
}

But my code didn’t catch any Json format result. However, from console window, I can see quite a lot of text output, like the following:
{
"partial" : "????? ???? ?????? ????? ?? ?? ??? ??? ?????? ?????? ?? ??????? ????? ????? ?? ????? ?? ?????????? ???? ???????????"
}
{
"result" : [{
"conf" : 0.953055,
"end" : 287.400000,
"start" : 287.071523,
"word" : "?????"
}, {
"conf" : 0.936494,
"end" : 287.820000,
"start" : 287.400000,
"word" : "????"
}, {
"conf" : 0.399469,
"end" : 288.329795,
"start" : 287.878682,
"word" : "??????"
}, {
"conf" : 0.545751,
"end" : 288.780000,
"start" : 288.329795,
"word" : "?????"
}, {
"conf" : 0.982125,
"end" : 289.203750,
"start" : 288.810000,
"word" : "??"
}, {
"conf" : 0.633553,
"end" : 289.410117,
"start" : 289.230000,
"word" : "??"
}, {
"conf" : 0.240568,
"end" : 289.768037,
"start" : 289.533633,
"word" : "???"
}, {
"conf" : 0.177813,
"end" : 290.100000,
"start" : 289.770000,
"word" : "???"
}, {
"conf" : 0.939531,
"end" : 290.730293,
"start" : 290.490000,
"word" : "???"
}, {
"conf" : 0.681968,
"end" : 291.180000,
"start" : 290.939971,
"word" : "???"
}, {
"conf" : 0.992080,
"end" : 291.600000,
"start" : 291.180117,
"word" : "??????"
}, {
"conf" : 1.000000,
"end" : 292.200000,
"start" : 291.900000,
"word" : "??"
}, {
"conf" : 1.000000,
"end" : 292.710000,
"start" : 292.200000,
"word" : "???????"
}, {
"conf" : 0.868925,
"end" : 293.187158,
"start" : 292.770293,
"word" : "?????"
}, {
"conf" : 0.280664,
"end" : 293.519912,
"start" : 293.190000,
"word" : "?????"
}, {
"conf" : 0.253797,
"end" : 293.845635,
"start" : 293.558174,
"word" : "??"
}, {
"conf" : 0.510191,
"end" : 294.779912,
"start" : 294.565898,
"word" : "?"
}, {
"conf" : 0.502767,
"end" : 294.870000,
"start" : 294.779912,
"word" : "??"
}, {
"conf" : 0.430731,
"end" : 295.518984,
"start" : 294.870000,
"word" : "??????????"
}, {
"conf" : 0.758802,
"end" : 295.770000,
"start" : 295.519980,
"word" : "????"
}, {
"conf" : 0.526706,
"end" : 296.730000,
"start" : 296.248740,
"word" : "???????????"
}],
"text" : "????? ???? ?????? ????? ?? ?? ??? ??? ??? ??? ?????? ?? ??????? ????? ????? ?? ? ?? ?????????? ???? ???????????"
}
{
"partial" : ""
}

Let me know if I made any mistake, I simply want to catch those Json format rec.Result() in C#.
Please advise,
Thanks,