PowerShell-枚举集合并更改集合 [英] PowerShell - Enumerating through a collection and change the collection
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问题描述
如何修复此脚本?
是的,我正在foreach循环中更改集合,这就是导致此错误的原因.
Yes, I´m changing the collection in the foreach loop and this is the reason for this error.
通过集合枚举时发生错误:集合已修改;枚举操作可能无法执行.在C:\ Users \ user \ Documents \ PowerShell \ ChangeAllListsV2.ps1:47 char:20+ foreach<<<<($ webLists中的$ list)+ CategoryInfo:InvalidOperation:(Microsoft.Share ... on + SPEnumerator:SPEnumerator)[],RuntimeException+ FullyQualifiedErrorId:BadEnumeration
#Script change in all lists the required field property "testfield" to false
#Part 0 - Configuration
$urlWebApp = "http://dev.sharepoint.com"
$countFound = 0
$countList = 0
$countFoundAndChange = 0
#Part 1 - PreScript
$snapin = Get-PSSnapin | Where-Object {$_.Name -eq "Microsoft.SharePoint.Powershell"}
if ($snapin -eq $null)
{
Write-Host "Loading SharePoint Powershell"
Add-PSSnapin Microsoft.SharePoint.Powershell
}
#Part 2 - Script
$webApp = Get-SPWebApplication $urlWebApp
#$webApp | fl
$webAppSites = $webApp.sites
foreach($site in $webAppSites)
{
Write-Host "***********************************************************************"
Write-Host "Found site: " $site -foreground blue
$siteAllWebs = $site.AllWebs
foreach($web in $siteAllWebs)
{
Write-Host "Found web: " $web -foreground blue
#$web | fl
$webLists = $web.Lists
foreach($list in $webLists)
{
$countList ++
Write-Host "Found list: " $list -foreground blue
#Change list property
$field = $Null
$field = $list.Fields["testfield"]
if($field){
Write-Host "Field found: " $list -foreground green
#Write-Host "in web: " $web -foreground green
$countFound ++
try{
if($field.Required)
{
#######################################################
$field.Required = $False
$field.Update()
#######################################################
$field = $Null
Write-Host "Done!: Change list: " $list -foreground green
$countFoundAndChange ++
}else{
Write-Host "Already!: Change list: " $list -foreground green
}
}
catch{
$field = $Null
Write-Host "Error!: Change list: " $list -foreground red
Write-Host "in web: " $web -foreground red
$_
}
}
}
}
}
Write-Host "Found lists: " $countList
Write-Host "Found lists with column [testfield]: " $countFound
Write-Host "Change lists with column [testfield]: " $countFoundAndChange
推荐答案
SPListCollection
倾向于在更新其属性(字段,事件接收器等)时修改集合.您可以使用for循环代替:
The SPListCollection
tends to modify the collection when updating its properties (fields, event receivers, etc.). You can use a for-loop instead:
for ($i = 0; $i -lt $webLists.Count; $i++)
{
$list = $web.Lists[$i];
# ...
}
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