将Console.Writeline（）语句的最终输出复制到文本文件和数组c＃

Question

I'm using VS2013 and I'm new to programming. In my program I have Console.Writeline statements like below. Frequency is a double variable that outputs a peak values of frequencies in real-time.

 if (Frequency > 328 && Frequency < 330)
 {                               
     Console.WriteLine(Frequency.ToString());
 }
 if (Frequency > 245 && Frequency < 247)
 {
     Console.WriteLine(Frequency.ToString());
 }
 if (Frequency > 195 && Frequency < 197)
 {
     Console.WriteLine(Frequency.ToString());
 }

Once I run the program, it outputs like this.

196.5654296875
246.9658203125
196.3984375
246.0322265625
196.5654296875
246.798828125
246.46484375
329.0322265625
329.0322265625
329.265625

I want to copy above whole final output numbers to a text file and to array also. But I don't have any idea how to do this. Please help me.

Answer 1

You can store it to a List<string> and have the same printed to a file like

 List<string> freq = new List<string>();

 if (Frequency > 328 && Frequency < 330)
 {                               
     Console.WriteLine(Frequency.ToString());
     freq.Add(Frequency.ToString());
 }

System.IO.File.WriteAllLines(@"D:\test\frequency_output.txt", freq.ToArray());

Answer 2

I would say the simplest way to do it, would be instantiate a writer that can write to file, and then call it's WriteLine() method similarlilly to console one, as such:

using (StreamWriter outfile = new StreamWriter("C:\numbers.txt"))
{
    if (Frequency > 328 && Frequency < 330)
    {                               
     Console.WriteLine(Frequency.ToString());
     outfile.WriteLine(Frequency.ToString());
    }
    if (Frequency > 245 && Frequency < 247)
    {
     Console.WriteLine(Frequency.ToString());
     outfile.WriteLine(Frequency.ToString());
    }
    if (Frequency > 195 && Frequency < 197)
    {
     Console.WriteLine(Frequency.ToString());
     outfile.WriteLine(Frequency.ToString());
    }   
}

You can find more on StreamWriter here: https://msdn.microsoft.com/pl-pl/library/System.IO.StreamWriter%28v=vs.110%29.aspx

This is not very effective of course, however it should you get started.

There is whole lot of material on working with files in C#, so you should not have problems with finding help there as well.