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Loading C# DLL with powershell, [System.Type]::GetType returns null

I have a simple DotNet DLL like this

namespace ClassLibrary1
{
public class Class1
{
public static void Test()
{
Process.Start("CMD.exe", "/C calc");
}
}
}


When I try to load this DLL with powershell

$Path = "c:\test\ClassLibrary1.dll";
$Namespace = "ClassLibrary1";
$ClassName = "Class1";
$Method = "Test";
$Arguments = $null

$Full_Path = [System.IO.Path]::GetFullPath($Path);
$AssemblyName = [System.Reflection.AssemblyName]::GetAssemblyName($Full_Path)
$Full_Class_Name = "$Namespace.$ClassName"
$Type_Name = "$Full_Class_Name, $($AssemblyName.FullName)"
$Type = [System.Type]::GetType($Type_Name)

$MethodInfo = $Type.GetMethod($Method)
$MethodInfo.Invoke($null, $Arguments)


It does not work, because [System.Type]::GetType($Type_Name) returned $null

[System.Type]::GetType($Type_Name)

$null

Any ideas?

[System.Type]::GetType

LoadFile

1 Answer
1

Use Add-Type -Path to load your assembly.

Add-Type -Path

After loading, to get a reference to that assembly's [ClassLibrary1.Class1] type as a [Type] for reflection via a string variable, simply cast the latter to [Type].

[ClassLibrary1.Class1]

[Type]

[Type]

The following fixed, annotated version of your code demonstrates the approach:

# Compile the C# source code to assembly .ClassLibrary1.dll
Add-Type -TypeDefinition @'
namespace ClassLibrary1
{
public class Class1
{
public static void Test()
{
System.Diagnostics.Process.Start("CMD.exe", "/C calc");
}
}
}
'@ -OutputAssembly .ClassLibrary1.dll


# Define the path to the assembly. Do NOT use "\" as the path separator.
# PowerShell doesn't use "" as the escape character.
$Path = ".ClassLibrary1.dll"
$Namespace = "ClassLibrary1"
$ClassName = "Class1"
$Method = "Test"
$Arguments = $null

# Load the assembly by its filesystem path, using the Add-Type cmdlet.
# Use of relative paths works.
Add-Type -Path $Path

$Full_Class_Name = "$Namespace.$ClassName"

# To get type [ClassLibrary1.Class1] by its full name as a string,
# simply cast to [type]
$Type = [type] $Full_Class_Name

$MethodInfo = $Type.GetMethod($Method)
$MethodInfo.Invoke($null, $Arguments)


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