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?

Answer 1

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.