How do I call New-Object for a constructor which takes a single array parameter?

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This approach to using new-object should work:

$cert = new-object System.Security.Cryptography.X509Certificates.X509Certificate `
      -ArgumentList @(,$bytes)

The trick is that PowerShell is expecting an array of constructor arguments. When there is only one argument and it is an array, it can confuse PowerShell’s overload resolution algorithm. The code above helps it out by putting the byte array in an array with just that one element.

Update: in PowerShell >= v5 you can call the constructor directly like so:

$cert = [System.Security.Cryptography.X509Certificates.X509Certificate]::new($bytes)

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