Powershell - Compare two XML documents.

Compare-XmlDocs.ps1

function Compare-XmlDocs($actual, $expected) {
    if ($actual.Name -ne $expected.Name) {
        throw "Actual name not same as expected: actual=" + $actual.Name
    }
    ##attributes...
    
    if ($actual.Attributes.Count -ne $expected.Attributes.Count) {
        throw "attribute mismatch for actual=" + $actual.Name
    }
    for ($i=0;$i -lt $expected.Attributes.Count; $i =$i+1) {
        if ($expected.Attributes[$i].Name -ne $actual.Attributes[$i].Name) {
            throw "attribute name mismatch for actual=" + $actual.Name
        }
        if ($expected.Attributes[$i].Value -ne $actual.Attributes[$i].Value) {
            throw "attribute value mismatch for actual=" + $actual.Name
        }
    }
    
    ##children
    if ($expected.ChildNodes.Count -ne $actual.ChildNodes.Count)  {
        throw "child node mismatch. for actual=" + $actual.Name
    }
        
    for ($i=0;$i -lt $expected.ChildNodes.Count; $i =$i+1) {
        if (-not $actual.ChildNodes[$i]) {
            throw "actual missing child nodes. for actual=" + $actual.Name
        }
        Compare-XmlDocs $actual.ChildNodes[$i] $expected.ChildNodes[$i]
    }
    
    if ($expected.InnerText) {
        if ($expected.InnerText -ne $actual.InnerText) {
           throw "inner text mismatch for actual=" + $actual.Name
        }
    }
    elseif ($actual.InnerText) {
        throw "actual has inner text but expected does not for actual=" + $actual.Name
    }
}

Very useful - thanks for posting! - but in line 28 did you really mean to have the parameters in reverse? i.e., Compare-XmlDocs $actual.ChildNodes[$i] $expected.ChildNodes[$i]

They don't match up with the order of parameters for the function

Fixed. Thanks!!

This is very useful for comparing two files with the same structure, have you ever written anything which can compare two XML files with both changes in attributes and structure i.e. nodes added/removed.