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using System;
using System.IO;

public class SingletonStreamWriter
{
    private static readonly Lazy<SingletonStreamWriter> instance = new Lazy<SingletonStreamWriter>(() => new SingletonStreamWriter());

    private StreamWriter streamWriter;

    // Private constructor to prevent external instantiation
    private SingletonStreamWriter()
    {
        // Initialize the stream writer here (replace "filePath" with your desired file path).
        // The "true" parameter indicates that the StreamWriter should append to the file if it exists.
        streamWriter = new StreamWriter("filePath", true);
    }

    // Public property to access the Singleton instance
    public static SingletonStreamWriter Instance => instance.Value;

    // Write function to write data to the stream
    public void Write(string data)
    {
        // Check if the stream writer has been disposed (closed) before writing
        if (streamWriter != null)
        {
            streamWriter.WriteLine(data);
            // You may also consider calling streamWriter.Flush() here if you want to flush the data immediately.
        }
    }

    // Close function to close the stream writer
    public void Close()
    {
        // Dispose the stream writer to close the file and release resources
        streamWriter?.Dispose();
        streamWriter = null;
    }
}