I am running a build, and I would like to be able to view the progress as it happens. But I would also like to save the output if the build has an error.
I know I can use Process.UseShellExecute = false, and RedirectStandardOutput, but that's only part of the story.
How can I do this?
Maybe like this?
class Tee
{
private readonly string m_programPath;
private readonly string m_logPath;
private TextWriter m_writer;
public Tee(string programPath, string logPath)
{
m_programPath = programPath;
m_logPath = logPath;
}
public void Run()
{
using (m_writer = new StreamWriter(m_logPath))
{
var process =
new Process
{
StartInfo =
new ProcessStartInfo(m_programPath)
{ RedirectStandardOutput = true, UseShellExecute = false }
};
process.OutputDataReceived += OutputDataReceived;
process.Start();
process.BeginOutputReadLine();
process.WaitForExit();
}
}
private void OutputDataReceived(object sender, DataReceivedEventArgs e)
{
Console.WriteLine(e.Data);
m_writer.WriteLine(e.Data);
}
}
Update
As Greg mentions in the comments below, MSBuild can write out to a log file while also outputting to console out of the box.
MSBuild [options] /filelogger /fileloggerparameters:LogFile=MSBuildLog.txt
Try the following simple C# program. It will take the redirected STDIN (Console.In) and write it to one or more files and STDOUT (Console.Out).
using System;
using System.Collections.Generic;
using System.IO;
namespace RedirectToFile
{
class Program
{
static void Main(string[] args)
{
var buffer = new char[100];
var outputs = new List<TextWriter>();
foreach (var file in args)
outputs.Add(new StreamWriter(file));
outputs.Add(Console.Out);
int bytesRead;
do
{
bytesRead = Console.In.ReadBlock(buffer, 0, buffer.Length);
outputs.ForEach(o => o.Write(buffer, 0, bytesRead));
} while (bytesRead == buffer.Length);
outputs.ForEach(o => o.Close());
}
}
}
I use it to redirect the output from an MSBuild batch file to disk whilst still outputting to the console window.
Usage: MSBuild [options] | RedirectToFile.exe MSBuildLog.txt
ReadBlock() isn't required to always return the whole buffer full. You should check for bytesRead > 0 instead.
msbuild.exe /logger option, msdn.microsoft.com/en-us/library/ms171470.aspx
MSBuild [options] /filelogger /fileloggerparameters:LogFile=MSBuildLog.txtthis answer should help you Redirect Standard Output Efficiently in .NET
PS I am never sure if linking to another answer on SO is an answer or a comment
