Running Powershell script in c# -ConvertToJson error

Question

I would like to run power shell scripts in c#.

Using the tutorial on running powershell scripts in c# from CodeProject (http://www.codeproject.com/Articles/18229/How-to-run-PowerShell-scripts-from-C)

I am able to run 'most' ps scripts (they run perfect in PS), but the one I require, I receive an error when trying to use the -ConvertFrom-Json command.

Error in script : The term 'ConvertFrom-Json' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.

I am new to this so not sure if its out of date libraries or other dependencies that are needed to make it work?

Answer 1

Since ConvertFrom-Json was introduced in Powershell 3.0, ensure that the runspace that you are creating is also Powershell 3.0+. You can do this by executing $Host.Version in the context of your C# code and looking at the Version object returned. It should have a Major Version of 3 or 4.

If it is 3.0+, since ConvertFrom-Json is included via the module Microsoft.PowerShell.Utility, make sure that the module is loaded by doing Import-Module Microsoft.PowerShell.Utility before your ConvertFrom-Json. The module is probably getting loaded via your normal session initialization scripts, but when being executed from code, it may not be executing those.