Example #1 (From Lee Holmes’ Powershell cookbook)

“Compile C# code on the fly”

$code =@' 
using System.Management.Automation; 
 
[Cmdlet("Write", "InputObject")] 
public class MyWriteInputObjectCmdlet : Cmdlet 
{ 
    [Parameter] 
    public string Parameter1; 
 
    [Parameter(Mandatory = true, ValueFromPipeline=true)] 
    public string InputObject; 
 
    protected override void ProcessRecord() 
    { 
        if (Parameter1 != null) 
                WriteObject(Parameter1 +  ":" +  InputObject); 
            else 
                WriteObject(InputObject); 
    } 
} 
'@


Add-Type -TypeDefinition $code  -OutputAssembly .\ExampleModule.dll 

Import-Module .\ExampleModule.dll

Example #2 (From Lee Holmes’ Powershell cookbook)
Showing how static functions are available directly

$source = @"
public class BasicTest
{
public static int Add(int a, int b)
{
return (a + b);
}

public int Multiply(int a, int b)
{
return (a * b);
}
}
"@

 Add-Type -TypeDefinition $source

[BasicTest]::Add(4, 3)

$basicTestObject = New-Object BasicTest 
$basicTestObject.Multiply(5, 2)

Example #3
Access .Net function to move mouse, in order to prevent screensaver from kicking in.

Function Move-Mouse {

param($minutes = 60)

for ($i = 0; $i -lt $minutes; $i++) {
  Start-Sleep -Seconds 60
  $Pos = [System.Windows.Forms.Cursor]::Position
[System.Windows.Forms.Cursor]::Position = New-Object System.Drawing.Point((($Pos.X) + 1) , $Pos.Y)

}
}