Powershell: A lowly script kiddy with no idea what he's doing (was attempting a "Hello World" in C#

[Quiet-ndl]

Steps to reproduce

Was typing this

using System;
class Hello
{
static void Main() {
Console.WriteLine("My, Dick");
}
replace "System;" with command; and it will crash and yield the result

Last 200 Keys: Console.WriteLine("My, Dick");
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Expected behavior

Windows powershell displays text: "My Dick"

Actual behavior

ErRoR

Environment data

Exception:
System.NullReferenceException: Object reference not set to an instance of an object.
at System.Management.Automation.Language.Parser.UsingStatementRule(Token usingToken)
at System.Management.Automation.Language.Parser.UsingStatementsRule()
at System.Management.Automation.Language.Parser.ScriptBlockRule(Token lCurly, Boolean isFilter, StatementAst predefinedStatementAst)
at System.Management.Automation.Language.Parser.ParseTask(String fileName, String input, List1 tokenList, Boolean recursed, ParseMode parseMode) at System.Management.Automation.Language.Parser.Parse(String fileName, String input, List1 tokenList, ParseError[]& errors, ParseMode parseMode)
at System.Management.Automation.Language.Parser.ParseInput(String input, String fileName, Token[]& tokens, ParseError[]& errors)

[vexx32]

Probably shouldn't crash here, but PowerShell isn't expected to parse C# syntax regardless. No idea what you're trying to do, but the only way to run C# code in PowerShell is via Add-Type -TypeDefinition "<code in a string>"

[daxian-dbw]

The null reference exception is thrown from parser, which should be fixed. The parser should be able to take any text without crashing.

[SeeminglyScience]

Only repos in 5.1 for me.

But honestly... that's one of the few things I'd say maybe should be back ported. Parser throwing NRE is scary.

[Quiet-ndl]

Probably shouldn't crash here, but PowerShell isn't expected to parse C# syntax regardless. No idea what you're trying to do, but the only way to run C# code in PowerShell is via Add-Type -TypeDefinition "<code in a string>"

so how exactly would a "hello world" look in powershell?

[vexx32]

Write-Host 'Hello World'

Or, if you're especially lazy:

"Hello World"

[Quiet-ndl]

Write-Host 'Hello World'

Or, if you're especially lazy:

"Hello World"

whoah whoah. I mean specifically in c# my bad

[vexx32]

Oh, right, sorry!

C# in PowerShell will be pretty much 1:1 for standard c# (most of the time), just wrap it in some quotes to make it a string and pass it to Add-Type:

Add-Type -TypeDefinition @"
using System;
public class Hello
{
    public static void World() {
        Console.WriteLine("Hello World!");
    }
}
"@
# Call the created class method from PS.
[Hello]::World()

Note that you'll often need to make the class and at least one of the methods public to be able to access them in PS.

[Quiet-ndl]

Add-Type : Cannot add type. The type name 'Hello' already exists.
At line:1 char:1

• Add-Type -TypeDefinition @"
• ~~~~~~~
  
  
  
  • CategoryInfo : InvalidOperation: (Hello:String) [Add-Type], Exception
  
  
  • FullyQualifiedErrorId : TYPE_ALREADY_EXISTS,Microsoft.PowerShell.Commands.AddTypeCommand
    
    :(
  
  

[rkeithhill]

You can't define the same type name over and over in PowerShell. Change the class name to Hello2 or restart PowerShell.