I came across a Powershell hash table article and it used .Get_Item() and .Set_Item().
Two questions:
1) What's the mechanism that allows syntax of .Get_Item() and .Set_Item() to work?
2) What Powershell command (if any) can one run to "discover" extra properties and methods that's not listed by Get-Member?
Example program:
$h = @{}
$h | get-member
$h | get-member -static
$h.add("copper", 29)
$h["copper"]
$h.item("copper")
$h.get_item("copper")
and the output shows Item() but neither Get_Item() nor Set_Item():
TypeName: System.Collections.Hashtable
Name MemberType Definition
---- ---------- ----------
Add Method System.Void Add(System.Object key, System.Object value)
Clear Method System.Void Clear()
Clone Method System.Object Clone()
Contains Method bool Contains(System.Object key)
ContainsKey Method bool ContainsKey(System.Object key)
ContainsValue Method bool ContainsValue(System.Object value)
CopyTo Method System.Void CopyTo(array array, int arrayIndex)
Equals Method bool Equals(System.Object obj)
GetEnumerator Method System.Collections.IDictionaryEnumerator GetEnumerator()
GetHashCode Method int GetHashCode()
GetObjectData Method System.Void GetObjectData(System.Runtime.Serialization.Serializatio...
GetType Method type GetType()
OnDeserialization Method System.Void OnDeserialization(System.Object sender)
Remove Method System.Void Remove(System.Object key)
ToString Method string ToString()
Item ParameterizedProperty System.Object Item(System.Object key) {get;set;}
Count Property System.Int32 Count {get;}
IsFixedSize Property System.Boolean IsFixedSize {get;}
IsReadOnly Property System.Boolean IsReadOnly {get;}
IsSynchronized Property System.Boolean IsSynchronized {get;}
Keys Property System.Collections.ICollection Keys {get;}
SyncRoot Property System.Object SyncRoot {get;}
Values Property System.Collections.ICollection Values {get;}
TypeName: System.Collections.Hashtable
Name MemberType Definition
---- ---------- ----------
Equals Method static bool Equals(System.Object objA, System.Object objB)
ReferenceEquals Method static bool ReferenceEquals(System.Object objA, System.Object objB)
Synchronized Method static hashtable Synchronized(hashtable table)
29
29
29
The get_ and set_ methods for any object will not be shown without specifying the -force parameter of the Get-Member cmdlet https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.utility/get-member:
-Force
Adds the intrinsic members (PSBase, PSAdapted, PSObject, PSTypeNames) and the compiler-generated get_ and set_ methods to the display. By default, Get-Member gets these properties in all views other than "Base" and "Adapted," but it does not display them