I declare an ArrayList using:
[System.Collections.ArrayList]$arr = @("foo", "bar", "some", "string")
..Then verify its type:
$arr.GetType()
But inserting a new value, using Insert() returns an error:
$arr.Insert("anotherstring")
Cannot find an overload for "Insert" and the argument count: "1".
What does this error message mean? What is the correct format when using this method?
Is there a better way to append items to the ArrayList?
I guess what you're looking for is to add an element.
$arr.Add("anotherstring")
The error you're getting with insert is because this method inserts an element in a given position of the array. It takes two arguments: position and element. Since you pass only one argument, it raises an error.
$arr | Get-Member does not display the Add method. Do you know why?
Get-Member -InputObject $arr would get you what you are looking for.You have to define the index of the element you're inserting, in other words the place where it will be placed.
$arr.Insert(1,"anotherstring")
After that your array will be like this
@("foo", "anotherstring", "bar", "some", "string")
New element of the array has index of 1
You can see the arguments expected like this, running the method without parentheses:
[Collections.ArrayList]$arr = echo foo bar some string
$arr.Insert
OverloadDefinitions
-------------------
void Insert(int index, System.Object value)
void IList.Insert(int index, System.Object value)
