What is the use of `default` keyword in C#?
What is the use of default keyword in C#? Is it introduced in C# 3.0 ?
启动命令窗口并在内部运行命令
原标题：Start command windows and run commands inside
I need to start the command window with some arguments and run more commands inside.
For example, launch a test.cmd and run mkdir.
I can launch the test.cmd with processstartinfo , but i am not sure how to run further commands. Can I pass further arguments to the test.cmd process?
How do I go about this?
Unable to add comments to answer... SO writing here.
Andrea, This is what I was looking for. However the above code doesnt work for me.
I am launching a test.cmd which is new command environment (like razzle build environment) and I need to run further commands.
psi.FileName = @"c: est.cmd";
psi.Arguments = @"arg0 arg1 arg2";
psi.RedirectStandardInput = true;
psi.RedirectStandardOutput = true;
psi.CreateNoWindow = true;
psi.UseShellExecute = false;
Process p = new Process();
p.StartInfo = psi;
p.Start();
p.StandardInput.WriteLine(@"dir>c:
esults.txt");
p.StandardInput.WriteLine(@"dir>c:
esults2.txt");
最佳回答
You can send further commands to cmd.exe using the process standard input. You have to redirect it, in this way:
var startInfo = new ProcessStartInfo
{
FileName = "cmd.exe",
RedirectStandardInput = true,
RedirectStandardOutput = true,
UseShellExecute = false,
CreateNoWindow = true
};
var process = new Process {StartInfo = startInfo};
process.Start();
process.StandardInput.WriteLine(@"dir>c:
esults.txt");
process.StandardInput.WriteLine(@"dir>c:
esults2.txt");
process.StandardInput.WriteLine("exit");
process.WaitForExit();
Remember to write "exit" as your last command, otherwise the cmd process doesn t terminate correctly...
问题回答
The /c parameter to cmd.
ProcessStartInfo start = new ProcessStartInfo("cmd.exe", "/c pause");
Process.Start(start);
(pause is just an example of what you can run)
But for creating a directory you can do that and most other file operations from c# directly
System.IO.Directory.CreateDirectory(@"c:fooar");
Start a cmd from c# is useful only if you have some big bat-file that you don t want to replicate in c#.
What are you trying to achieve? Do you actually need to open a command window, or do you need to simply make a directory, for example?
mkdir is a windows executable - you can start this program in the same way you start cmd - there s no need to start a command window process first.
You could also create a batch file containing all the commands you want to run, then simply start it using the Process and ProcessStartInfo classes you re already using.
How come this doesn t work?
var startInfo = new ProcessStartInfo
{
FileName = "cmd.exe",
RedirectStandardInput = true,
RedirectStandardOutput = true,
UseShellExecute = false,
CreateNoWindow = false
};
var process = new Process { StartInfo = startInfo };
process.Start();
process.StandardInput.WriteLine(@" dir");
process.WaitForExit();
here is a code example of F#, that does not work at all for some reason, it is in F#:
open System
open System.Diagnostics
let runProc filename args startDir : seq * seq =
let timer = Stopwatch.StartNew()
let procStartInfo =
ProcessStartInfo(
RedirectStandardOutput = true,
RedirectStandardError = true,
UseShellExecute = false,
FileName = filename,
Arguments = args
)
match startDir with | Some d -> procStartInfo.WorkingDirectory <- d | _ -> ()
let outputs = System.Collections.Generic.List()
let errors = System.Collections.Generic.List()
let outputHandler f (_sender:obj) (args:DataReceivedEventArgs) = f args.Data
use p = new Process(StartInfo = procStartInfo)
p.OutputDataReceived.AddHandler(DataReceivedEventHandler (outputHandler outputs.Add))
p.ErrorDataReceived.AddHandler(DataReceivedEventHandler (outputHandler errors.Add))
let started =
try
p.Start()
with | ex ->
ex.Data.Add("filename", filename)
reraise()
if not started then
failwithf "Failed to start process %s" filename
printfn "Started %s with pid %i" p.ProcessName p.Id
p.BeginOutputReadLine()
p.BeginErrorReadLine()
p.WaitForExit()
timer.Stop()
printfn "Finished %s after %A milliseconds" filename timer.ElapsedMilliseconds
let cleanOut l = l |> Seq.filter (fun o -> String.IsNullOrEmpty o |> not)
cleanOut outputs,cleanOut errors
i do not know what the problem is with this, but a function may not be called. that is all I am guessing the problem is.
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