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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Calling base class method in a System.Xml.XmlNode-derived custom class fails; invokes own method instead, resulting in infinite recursion","articleBody":"The documented syntax for invoking a base-class method from a PS custom class is  \r\n`([\u003cbase-class\u003e] $this).\u003cmethod\u003e()`, but that doesn't seem to work, as discovered in [this SO question](https://stackoverflow.com/q/49259408/45375).\r\n\r\nInstead, the derived class' method itself is invoked, resulting in infinite recursion.\r\n\r\n**Update**: The problem appears to be specific to `[System.Xml.XmlNode]`-derived classes; see [@daxian-dbw's comment below](https://github.com/PowerShell/PowerShell/issues/6386#issuecomment-372869624).\r\n\r\nA reflection-based workaround can be found in [this answer](https://stackoverflow.com/a/49265123/45375).\r\n\r\nSteps to reproduce\r\n------------------\r\n\r\n```powershell\r\nclass child : System.Xml.XmlDocument {\r\n  [void] LoadXml([string]$content) {\r\n    Write-Host 'Inside overridden LoadXml.'\r\n    # Try to call the base type's .LoadXml() method.\r\n    ([System.Xml.XmlDocument] $this).LoadXml($content)\r\n  }\r\n}\r\n\r\n[child]::new().LoadXml('\u003cfoo\u003ebar\u003c/foo\u003e')\r\n```\r\n\r\nExpected behavior\r\n-----------------\r\n\r\n```none\r\nInside overridden LoadXml.\r\n```\r\n\r\nThe message should print once, and the XML string should be loaded into the instance via the call to the base-class method.\r\n\r\nActual behavior\r\n---------------\r\n\r\n```none\r\nInside overridden LoadXml.\r\nInside overridden LoadXml.\r\n...\r\n```\r\n\r\nThe method keeps calling itself and eventually runs into a call-depth overflow.\r\n\r\n\r\nEnvironment data\r\n----------------\r\n\r\n\u003c!-- provide the output of $PSVersionTable --\u003e\r\n\r\n```powershell\r\nPowerShell Core v6.0.1 on macOS 10.13.3\r\nPowerShell Core v6.0.1 on Ubuntu 16.04.3 LTS\r\nPowerShell Core v6.0.1 on Microsoft Windows 10 Pro (64-bit; v10.0.15063)\r\nWindows PowerShell v5.1.15063.674 on Microsoft Windows 10 Pro (64-bit; v10.0.15063)\r\n```\r\n","author":{"url":"https://github.com/mklement0","@type":"Person","name":"mklement0"},"datePublished":"2018-03-13T20:32:33.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/6386/PowerShell/issues/6386"}