Check if a string is not NULL or EMPTY

Question

In below code  I need to check if version string is not empty then append its value to the request variable   if   string   IsNullOrEmpty  version          request           version     How to check not in if condition

User · Answer

I would define  Version as a string to start with    string  Version   and if it s a param you can use the code posted by Samselvaprabu or if you would rather not present your users with an error you can do something like  while  -not  version         version   Read-Host  Enter the version ya fool      request           version

User · Answer

if    variablename    Write-Host  variable is null     I hope this simple answer will is resolve the question  Source

User · Answer

As in many other programming and scripting languages you can do so by adding   in front of the condition  if    string   IsNullOrEmpty  version          request           version

User · Answer

If the variable is a parameter then you could use advanced function parameter binding like below to validate not null or empty     CmdletBinding    Param        parameter mandatory  true        ValidateNotNullOrEmpty         string  Version

User · Answer

if  -not   string   IsNullOrEmpty  version           request           version     You can also use   as an alternative to -not

User · Answer

You don t necessarily have to use the  string    prefix  This works in the same way   if   version         request           version     A variable that is null or empty string evaluates to false

[powershell] Check if a string is not NULL or EMPTY

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