How to read PowerShell script stdout and stderr from C#
.net, c#, powershell, windows
Solution
PowerShell's `stdout` output to another exe is synthesized by taking objects and projecting a string view of them. PowerShell's native output is a stream of objects. If you want to a string version of those objects then use `Out-String`. However, from a C# perspective it is often more useful to deal directly with the objects that PowerShell outputs.
For `stderr`, you can read ErrorRecords from the `PowerShell.Streams.Error` property. If you want a human readable string for those as well, run them thru Out-String before outputting to your user.
Problem
I'm implementing a custom PowerShell host and I need to read stdout and stderr of the PowerShell script. Problem is that I do not get stdout when I convert object returned by invoking pipeline to string. However, when I add "out-string" cmdlet to the pipeline it works perfectly fine. Is there any way to fetch stdout and stderror without using "out-string"? ``` this.currentPowerShell.AddScript(cmd); Collection<PSObject> results = this.currentPowerShell.Invoke(); foreach (PSObject obj in results) { Console.WriteLine(obj.ToString()); } ``` When I use the code above I only get partial stdout.