除上述方法外,还可以在PowerShell中使用IsNullOrEmpty静态方法。 使用-eq运算符检查字符串是否为null或empty -eq运算符用于比较两个值是否相等。您可以将字符串与一个空字符串进行比较,以检查它是否为空。 代码: $str1=""if($str1-eq"") {Write-Host"String is empty"}else{Write-Host"String is not empty"...
PS> $object = [PSCustomObject]@{Name='TestObject'} PS> $object.count $null 如果仍在使用 PowerShell 5.1,则可以在检查计数之前将对象包装在数组中,以获取准确的计数。PowerShell 复制 if ( @($array).count -gt 0 ) { "Array isn't empty" } 稳妥起见,请检查是否有 $null,然后再检查计数。Pow...
functionTest-MrParameterValidation{ [CmdletBinding()]param( [Parameter(Mandatory)] [string[]]$ComputerName)Write-Output$ComputerName} 也许你想为 ComputerName 参数指定一个默认值(如果未指定)。 问题在于,默认值不能与必需参数一起使用。 你需要将ValidateNotNullOrEmpty参数验证属性与默认值一起使用。
Class SoundNames : System.Management.Automation.IValidateSetValuesGenerator { [string[]] GetValidValues() { $SoundPaths = '/System/Library/Sounds/', '/Library/Sounds','~/Library/Sounds' $SoundNames = ForEach ($SoundPath in $SoundPaths) { If (Test-Path $SoundPath) { (Get-C...
[ValidateNotNullorEmpty()] [System.String]$ServerName, [System.String]$DomainName, [System.String]$CARootName, [System.String]$CAServerFQDN, [System.String]$CertSubject, [System.String]$SMBShare, [Parameter(Mandatory=$true)] [ValidateNotNullorEmpty()] [PsCredential]$Credential) Configuration ...
if (comboBox1.Text == "" || textBox1.Text == "") { MessageBox.Show("Please enter search criteria and term", "Error"); } listBox1.Items.Clear(); MessageBox windows are not part of an application's Form object and dealing with them is a basic UI test automation technique. After...
"System.Int64". Error: "Input string was not in a correct format "System.Object[]" "telnet" connection test to different servers on different ports "Unable to find a default server with Active Directory Web Services running" when calling a script with Import-module AD "Unable to process the...
How can I search a text file using Windows PowerShell? Filename : Test.txt Path : C:\Scripts\Test.txt Pattern : Hey, Scripting Guy! Want to see just the file name for each file containing the target string? Try this command:Copy ...
Test-Path C:\Scripts\Archive -pathType container What we’ve done here is tack on the –pathType parameter and assign the parameter the value container. That means that we want to know if the specified object (C:\Scripts\Archive) is a container: that is, is it capable of containing oth...
If we grab the count on $error, you will notice it has increased to one item. Dumping that object to the pipeline by accessing $error[0] just prints the error we already saw, right back at us.PS C:\> ThisCmdlet-DoesNotExist The term 'ThisCmdlet-DoesNotExist' is not recognized as the...