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    <p>My first thought is when you are attaching this property to an object, you are attaching it to a specific instance of that object. When your variable losses the reference to that object, any knowledge of that new property is lost.</p> <p>My guess is the next time you get that item, you are creating a new FunctionInfo object with foo's properties (as stored in the function provider).</p> <p>When you call Get-Item or Get-ChildItem, it returns object references to the .NET types that represent the underlying items. Those items do not exist in memory indefinitely (imagine a FileInfo object for every file on every local drive and every mapped drive living in memory.. ouch). Since PowerShell is creating a new instance every time you call Get-Item, you are getting the basic FunctionInfo object.</p> <p>If you want to add a property to all items of a particular type, you can with PowerShell's extensible type system. You can create a custom .ps1xml file and load that into a PowerShell session that can add a property to every instance of a type. Some great examples on the PowerShell Team Blog are here -> <a href="http://blogs.msdn.com/powershell/archive/2008/09/06/hate-add-member-powershell-s-adaptive-type-system.aspx" rel="nofollow noreferrer">Hate Add-Member</a> and <a href="http://blogs.msdn.com/powershell/archive/2006/06/24/644987.aspx" rel="nofollow noreferrer">Leveraging the PowerShell Type Extensions to Get Documentation</a>.</p> <p>EDIT (addressing comment): I understand what you are trying to do, but the failure is due to the new property being "grafted" on to a PSObject wrapper that allows for the on-the-fly addition of properties. The new property is never really part of that FunctionInfo object that you are retrieving from the PSDrive. </p> <p>In addition, the function provider (the function: psdrive), does not have a mechanism for storing that additional property. It knows and works with FunctionInfo objects. When you ask for an item from the Function: PSDrive, the Function provider returns a FunctionInfo object. When you save a function to the Function: PSDrive, the provider can only store values for properties it knows how to handle. One could write a custom provider that would handle new properties from the PSObject wrapper, but that is not part of the default functionality in this provider.</p> <p>EDIT #2: Ok, this has been bugging me. <a href="http://blog.usepowershell.com/2009/02/adding-custom-properties-to-functions/" rel="nofollow noreferrer">I blogged about a workaround</a>.</p>
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    1. POHow do you add a property to a function object on the PowerShell PSDrive "function:"?
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    1. POHow do you add a property to a function object on the PowerShell PSDrive "function:"?
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    1. COI only want to attach properties to specific items not all of a type. I do agree about the temporary nature of the attachment. But I'm reassigning the object and saving it to the function: PSDrive where it remains. Other properties are preserved (with any changes), but the added ones are missing.
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    2. CO@Roy, I updated my answer to try to clarify.
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    3. COThanks for the clarification; that helps me understand the problem. And thanks for the workaround as well.
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