Fix for the problem reported in https://gist.github.com/3002649

repro-xmlschemaset-memoryleak-fixed.ps1

function cleanup() {
	write-host "Cleaning up..."
	remove-item $schemaFile
	break
}

trap {
	cleanup
}


$TEST_SCHEMA = @'
<schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="urn:x">
	<element name="a" type="string"/>
	<element name="b" type="string"/>
	<element name="c" type="string"/>
	<element name="d" type="string"/>
	<element name="e" type="string"/>
	<element name="f" type="string"/>
	<element name="A" type="x:string"/>
	<element name="B" type="string"/>
	<element name="C" type="string"/>
	<element name="D" type="string"/>
	<element name="E" type="y:string"/>
	<element name="F" type="string"/>
</schema>
'@

Add-Type -ReferencedAssemblies System.Xml -TypeDefinition @" 
using System;
using System.Collections.Generic;
using System.IO;
using System.Xml;
using System.Xml.Schema;
 
public class XsdValidator
{
    private List<ValidationEventArgs> _errors = new List<ValidationEventArgs>();

    public IEnumerable<ValidationEventArgs> Validate(string schemaFileName)
    {
    	XmlSchemaSet schemaSet = new XmlSchemaSet();
	schemaSet.ValidationEventHandler += ValidationCallBack;
	using (XmlReader reader = XmlReader.Create(schemaFileName)) {
		schemaSet.Add(null, reader);
	}
	schemaSet.Compile();
        return _errors;
    }

    private void ValidationCallBack(object sender, ValidationEventArgs e)
    {            
        _errors.Add(e);
    }
} 
"@ 

$schemaFileName = [System.IO.Path]::GetTempFileName()

$TEST_SCHEMA > $schemaFileName

$count = 0

$N = 10000

1..$N |% {

	try {
		$validator = new-object -typename XsdValidator
		$validator.Validate($schemaFileName) |% {
			$a = $_
			$e = $a.Exception
			$GLOBAL:count += 1
			write-host "#$GLOBAL:count ${schemaFileName}: $($a.Severity) in $($e.SourceUri) at line $($e.LineNumber) column $($e.LinePosition): $($e.Message)"
		}
	} catch {
		write-host "$($schemaFileName): Exception: $_"
	}
}

write-host