Powershell: Adding element to hashtable failed

Question

PS C:\Users\Hind> $b=@{}
PS C:\Users\Hind> $b+={k="a";v="b"}
A hash table can only be added to another hash table.
At line:1 char:1
+ $b+={k="a";v="b"}
+ ~~~~~~~~~~~~~~~~~
+ CategoryInfo          : InvalidOperation: (:) [], RuntimeException
+ FullyQualifiedErrorId : AddHashTableToNonHashTable

Why did it fail? How can I add one element to a hashtable successfully?

Matt · Accepted Answer · 2016-02-06 17:49:37Z

5

Correction, this fails because you are missing the @ character in front of @{k="a";b="b"}

PS C:\Users\Hind> $b=@{}
PS C:\Users\Hind> $b+=@{k="a";v="b"}

@{} is declaring a new hash table. {} is a script block. They are not the same.

edited Feb 6, 2016 at 17:49

Matt

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answered Feb 6, 2016 at 2:37

Daniel Lesser

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5 Comments

Hind Forsum Over a year ago

So, can I append one hashtable to another? Any syntax like this? I'm not sure if Powershell supports any kind of operator overloading?

Daniel Lesser Over a year ago

{} is just a closure in PowerShell without @{} and so the operands are of different types if @ is omitted.

Hind Forsum Over a year ago

i tried : D:\> $myhash=@{k1="va1";k2="val2"} PS D:\> $myhash+={k3="val3"} A hash table can only be added to another hash table. Still doesn't work?

Daniel Lesser Over a year ago

$myhash+=@{k3="val3"}

Daniel Lesser Over a year ago

@{} = declaring a new hash table. {} is a script block. They aren't the same.

bonm014 · Accepted Answer · 2017-07-04 09:59:03Z

3

Initialising the hashtable should be with round bracket instead of curly brackets

$b=@()
$b+=@{k="a";v="b"}

answered Jul 4, 2017 at 9:59

bonm014

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