[英]Powershell variable is assigned the result of a function AND the parameter I passed to the function
I'm running into this over and over in my script. 我在我的剧本中一遍又一遍地遇到这种情况。 I have this line of code:
我有这行代码:
$Errors = Get-DeploymentErrors $uniqueID
When this runs, $Errors is assigned the result of Get-DeploymentErrors and the value of $uniqueID. 运行时,会为$ Errors分配Get-DeploymentErrors的结果和$ uniqueID的值。 I just want $Errors to be assigned the result of Get-DeploymentErrors.
我只想为$ Errors分配Get-DeploymentErrors的结果。
Here is the Get-DeploymentErrors function: 以下是Get-DeploymentErrors函数:
Function Get-DeploymentErrors($uniqueID)
{
$Errors = @()
$conn = New-Object -TypeName System.Data.SqlClient.SqlConnection
$conn.ConnectionString = 'removed connection string'
$cmd = New-Object -TypeName System.Data.SqlClient.SqlCommand
$cmd.Connection = $conn
$cmd.CommandText = "removed sql statement"
$cmd.Parameters.AddWithValue("@uniqueID", $uniqueID)
$conn.Open()
$reader = $cmd.ExecuteReader()
if($reader.HasRows)
{
While ($reader.Read())
{
$error = New-Object -TypeName PSObject
$error | Add-Member -MemberType NoteProperty -Name StepID -Value $reader["StepID"]
$error | Add-Member -MemberType NoteProperty -Name DeploymentID -Value $reader["DeploymentID"]
$error | Add-Member -MemberType NoteProperty -Name MessageID -Value $reader["MessageID"]
$error | Add-Member -MemberType NoteProperty -Name Severity -Value $reader["Severity"]
$error | Add-Member -MemberType NoteProperty -Name Message -Value $reader["Message"]
$error | Add-Member -MemberType NoteProperty -Name StepName -Value $reader["StepName"]
$error | Add-Member -MemberType NoteProperty -Name CurrentStep -Value $reader["CurrentStep"]
$error | Add-Member -MemberType NoteProperty -Name TotalSteps -Value $reader["TotalSteps"]
$error | Add-Member -MemberType NoteProperty -Name CurrentTime -Value $reader["CurrentTime"]
$Errors += $error
}
}
return $Errors
}
$cmd.Parameters.AddWithValue()
echoes the added parameter, and PowerShell functions return the entire non-captured output on the success output stream , not just the argument of the return
keyword. $cmd.Parameters.AddWithValue()
回显添加的参数,PowerShell函数返回成功输出流上的整个非捕获输出,而不仅仅是return
关键字的参数。
Quoting from about_Return
(emphasis mine): 引自
about_Return
(强调我的):
SHORT DESCRIPTION
简短的介绍
Exits the current scope, which can be a function, script, or script block.退出当前范围,可以是函数,脚本或脚本块。
LONG DESCRIPTION
详细描述
The Return keyword exits a function, script, or script block.Return关键字退出函数,脚本或脚本块。 It can be used to exit a scope at a specific point, to return a value, or to indicate that the end of the scope has been reached.
它可用于退出特定点的范围,返回值或指示已达到范围的结尾。
Users who are familiar with languages like C or C# might want to use the Return keyword to make the logic of leaving a scope explicit.
熟悉C或C#等语言的用户可能希望使用Return关键字来制作明确保留范围的逻辑。
In Windows PowerShell, the results of each statement are returned as output, even without a statement that contains the Return keyword.
在Windows PowerShell中, 即使没有包含Return关键字的语句,每个语句的结果也会作为输出返回。 Languages like C or C# return only the value or values that are specified by the Return keyword.
C或C#等语言仅返回Return关键字指定的值。
Use any of the following methods to suppress the undesired output: 使用以下任一方法来抑制不需要的输出:
[void]$cmd.Parameters.AddWithValue("@uniqueID", $uniqueID)
$cmd.Parameters.AddWithValue("@uniqueID", $uniqueID) | Out-Null
$cmd.Parameters.AddWithValue("@uniqueID", $uniqueID) > $null
$param = $cmd.Parameters.AddWithValue("@uniqueID", $uniqueID)
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