$str4=" "if($str4-match"^\s*$") {Write-Host"String is empty"}else{Write-Host"String is not empty"} 输出: String is empty
Powershell会给数据分配一个最佳的数据类型;如果一个整数超出了32位整数的上限([int32]::MaxValue),它就会分配一个64位整数的数据类型;如果碰到小数,会分配一个Double类型;如果是文本,Powershell会分配一个String类型;如果是日期或者时间,会被存储为一个Datetime对象。 这种类型自适应也称作“弱类型”,虽然使用起来...
$string="Hello World" The following example checks if a$stringvariable is null or not in PowerShell. It returns the first statement if the variable is not null or empty and the second statement if the variable is null or empty. if($string) {Write-Host"The variable is not null."}else...
if($PSBoundParameters.ContainsKey('Value') ){...} IsNotNullOrEmpty 如果值为字符串,则可以同时使用静态字符串函数来检查值为$null还是空字符串。 PowerShell if(-not[string]::IsNullOrEmpty($value) ){...} 当我知道值类型应该是字符串时,我经常使用此值。
If processNames Is Nothing Then Dim processes As Process() processes = Process.GetProcesses() End If '/ If process names are specified, write the processes to the '/ pipeline to display them or make them available to the next cmdlet. For Each name As String In processNames '...
我对PowerShell中的(if)命令有一个小问题 =是赋值,而不是相等运算符。 如果您希望给定的url中至少有2个点,请尝试 $url = Read-Host 'URL'if ( [regex]::matches($Url, '\.').Count -lt 2 ){ msg * "The url does not contain 2 dots (.)"} ...
Checking if a string is NULL or EMPTY is very common requirement in Powershell script. If we don’t do that we will end up with run time errors if we try to perform some operation on that string variable which is empty or null. So the question now is, how to check it?
If you type Get-SmallFiles without a value, the function assigns 100 to $size. If you provide a value, the function uses that value. Optionally, you can provide a brief help string that describes the default value of your parameter, by adding the PSDefaultValue attribute to the description ...
Get-ChildItem [[-Filter] <string>] -LiteralPath <string[]> [-Include <string[]>] [-Exclude <string[]>] [-Recurse] [-Depth <uint>] [-Force] [-Name] [<CommonParameters>]说明Get-ChildItem cmdlet 获取一个或多个指定位置中的项。 如果该项为容器,则此命令将获取容器内的各项(称为子项)。
Delete the msix blob if it's already there (#24353) (#24516) Add CodeQL scanning to APIScan build (#24303) (#24515) Update vpack pipeline (#24281) (#24514) Fix seed max value for Container Linux CI (#24510) (#24511) Bring preview.5 release fixes to release/v7.5 (#24379) (...