using svn diff command in code

Question

Hi i have a problem using svn command in code behind :

public void SvnDiff(int rev1, int rev2)
        {
            try
            {
                var p = new Process();
                p.StartInfo.UseShellExecute = false;
                p.StartInfo.RedirectStandardOutput = true;
                p.StartInfo.FileName = "svn";
                string arg = string.Format("diff -r {0}:{1} --summarize --xml > SvnDiff.xml", rev1, rev2);
                Console.WriteLine(arg);
                p.StartInfo.Arguments = arg;
                p.Start();
                p.WaitForExit();
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }
        }

When i use this command in cmd, it's working fine. svn diff -r 2882:2888 --summarize --xml > SvnDiff.xml

but when i run my method i got this message: svn: E020024: Error resolving case of '>'

What can i do right now to solve this ? Thanks for any advice

Answer 1

You can read all text and then write to the file as @Scott suggested, but it can be problematic if the output is too large.

You can instead write as the output is generated. Create a local StreamWriter for the file, and a method to write whenever new output data is available:

StreamWriter redirectStream = new StreamWriter("SvnDiff.xml")

void Redirect(object Sender, DataReceivedEventArgs e)
{
  if ((e.Data != null)&&(redirectStream != null))
    redirectStream.WriteLine(e.Data);
}

and when you start the process:

p.OutputDataReceived += new DataReceivedEventHandler(Redirect); // handler here to redirect
p.Start();
p.BeginOutputReadLine();
p.WaitForExit();

redirectStream.Flush();
redirectStream.Close();

Answer 2

The > SvnDiff.xml part of your command line aren't arguments being passed to SVN. They're redirecting standard output. To do that, take a look at the documentation:

Since you already have RedirectStandardOutput set properly, you just need to take advantage of it. Simply put

string output = p.StandardOutput.ReadToEnd();

in front of your p.WaitForExit(); line.

Then, just use File.WriteAllText("SvnDiff.xml", output);

Answer 3

Try with this....

var p = new Process();
p.StartInfo.UseShellExecute = false;
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.FileName = "cmd.exe";
string arg = string.Format("/K svn diff -r {0}:{1} --summarize --xml > SvnDiff.xml", rev1, rev2);
Console.WriteLine(arg);
p.StartInfo.Arguments = arg;
p.Start();
p.WaitForExit();

if it works then change /K with /C

Answer 4

Thanks for answers, I use StandardOutput and it work :)

var p = new Process();
                p.StartInfo.UseShellExecute = false;
                p.StartInfo.RedirectStandardOutput = true;
                p.StartInfo.FileName = "svn";
                p.StartInfo.Arguments = string.Format("diff -r {0}:{1} --summarize --xml", rev1, rev2);
                p.Start();
                string output = p.StandardOutput.ReadToEnd();
                p.WaitForExit();
                File.WriteAllText("SvnDiff.xml", output);

Thanks for all of you.