"Cannot find the requested data item, such as a data key or value. " Hogy oldjam meg?

Microsoft.Speech (Speech SDK 11)

"

_rec.SetInputToDefaultAudioDevice(); // <---- "Cannot find the requested data item, such as a data key or value."

"

"

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

using Microsoft.Speech.Recognition;

namespace AI

{

public partial class Form1 : Form

{

SpeechRecognitionEngine _rec = new SpeechRecognitionEngine();

public Form1()

{

InitializeComponent();

}

private void Form1_Load(object sender, EventArgs e)

{

Choices ch = new Choices();

ch.Add(new string[] { "Hello, Hi, Help" });

GrammarBuilder gb = new GrammarBuilder();

gb.Append(ch);

Grammar grammar = new Grammar(gb);

try

{

_rec.LoadGrammarAsync(grammar);

_rec.SetInputToDefaultAudioDevice(); // <---- "Cannot find the requested data item, such as a data key or value."

_rec.SpeechRecognized += _rec_SpeechRecognized;

}

catch (Exception ex)

{

richTextBox1.Text = (richTextBox1.Text + "\n" + ex.Message);

}

}

private void _rec_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)

{

richTextBox1.Text = (richTextBox1.Text + "\n" + e.Result.Text);

}

private void Button1_Click(object sender, EventArgs e)

{

this.Close();

}

}

}