PowerShell 中有一些運算子可讓您將命令包裝至下一行。 如果您想要將表達式分成多行,邏輯運算子-and和-or是很好的運算符。 PowerShell if($null-ne$user-and$user.Department-eq'Finance'-and$user.Title-match'Senior'-and$user.HomeDrive-notlike'\\server\*') {# Do Something} ...
当-match 结果为 False,或者 -notmatch 结果为 True 或输入为集合时,不会覆盖 $Matches 自动变量。 因此,如果尚未设置变量,它将包含以前设置的值,或 $null。 在调用其中一个运算符后引用 $Matches 时,请考虑使用条件语句验证当前运算符调用是否设置了变量。 示例: PowerShell 复制 if ("<version>1.0.0</ve...
It returnsTrueif the variable is equal to$nullandFalseif the variable is not equal to$null. $str-eq$null Output: False We can use any of the methods above and easily determine whether a string variable is not null or empty in PowerShell....
Calling the function at the beginning, or outside of a pipeline, executes the process block once. Within a pipeline, the process block executes once for each input object that reaches the function. If the pipeline input that reaches the function is empty, the process block does not execute....
[ValidateNotNull] [ValidateNotNullOrEmpty] [ValidateNotNullOrWhiteSpace] [ValidatePattern] [ValidateRange] [ValidateScript] [ValidateSet] [ValidateTrustedData] [ValidateUserDrive] [version] [void] [WildcardPattern] [wmi] (Windows-only) [wmiclass] (Windows-only) [wmisearcher] (Windows-only) [X50...
$EnumTypes is an empty array to hold the dynamically created types. $IntegralTypes is an array that contains the valid underlying types for an enumeration. PowerShell Copy $EnumTypes = @() $IntegralTypes = @( 'byte', 'sbyte', 'short', 'ushort', 'int', 'uint', 'long', 'ulong' ...
It isn’t what you expect. Because of the type inference methods used in PowerShell the array with the single $null or empty field are being converted to false when the comparison is on the left, and converted to true when there are two $nulls in the array. This works all the way, ...
minutes." # -le for lesser or equal, -ge for greater or equal if ( ($BacklogSum -ge 0) -and ($BacklogSum -le $maxInputBacklog) -and ` # is not null and is under the threshold ($WatermarkAvg -ge 0) -and ($WatermarkAvg -le $maxWatermark) -and ` # is not null and is ...
LessOrEqual Like Match NotContains NotCount NotEndsWith NotHasField NotIn NotLike NotMatch NotNull NotStartsWith NotWithinPath Null NullOrEmpty TypeOf SetOf StartsWith Subset Version WithinPath Badges Baselines Baseline specs Baseline scopes Conventions Using conventions Defining conventions Begin Proce...
Provide an argument that is not null or empty, and then try the command again. CannotConnect,PSSessionStateBroken Cant access a fileshare through a remote PS Session Cant make work with variable in Get-ADuser command to get UPN Cant return string for msExchMailboxGUID Cant use dfsutil in ...