Return the result while the process is running

Question

I have a program which start a batch process. This batch file is a consuming process and I want to return the result while the process is running. I try to use await and async but nothing works.

            result = String.Empty;
            ProcessStartInfo startinfo = new ProcessStartInfo();
            startinfo.FileName = RunText;
            startinfo.Arguments = "cmd";
            Process process = new Process();
            process.StartInfo = startinfo;
            process.StartInfo.UseShellExecute = false;
          
            process.StartInfo.RedirectStandardOutput = true;
            process.Start();
            
           
            while (!process.StandardOutput.EndOfStream)
            {
                result = process.StandardOutput.ReadLine();//I want to return the result  
                Console.WriteLine(result);
                    
            }

-This is my batch program. The output is 1 if there is a connection with another PC.

@echo off
:begin
for /F "tokens=*" %%L in ('netstat -n ^| find ":3389" ^| find "ESTABLISHED" /c') do (set "VAR=%%L")
echo %VAR%
goto begin

I am beginner with this topics(processes and multi-threading). Any help would be greatly appreciated.

Answer 1

Use handlers to achieve this:

public static void MyHandler(object process, DataReceivedEventArgs dataReceived)
{
    if (!String.IsNullOrEmpty(dataReceived.Data))
    {
        // do something you want here, for an example
        Console.WriteLine(dataReceived.Data);
    }
}

And in main method:

//...
process.StartInfo.RedirectStandardOutput = true;
process.OutputDataReceived += new DataReceivedEventHandler(MyHandler);
process.Start();