C# 连接到SharePoint时解决Shell问题

任何人都可以在此提供帮助：

Add-Type –Path "C:\Users\chauda31\SharePointDLL\Microsoft.SharePoint.Client.dll"
Add-Type –Path "C:\Users\chauda31\SharePointDLL\Microsoft.SharePoint.Client.Runtime.dll"


#Mysite URL
$site = 'https://triasdasdadcaplc.sharepoint.com/sites/ServadfficeDeliveryDashboard/'

#Admin User Principal Name
$admin = 'arvind.chaudhary@cedsfsfcxznt.com'

#Get Password as secure String
$password = Read-Host 'Enter Password' -AsSecureString

#Get the Client Context and Bind the Site Collection
$context = New-Object Microsoft.SharePoint.Client.ClientContext($site)

#Authenticate
$credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($admin , $password)
$context.Credentials = $credentials

$list = $context.Web.Lists.GetByTitle('Daily Status')
$context.Load($list)
#$list.Description = "CSOM PowerShell - Did it!!!"
$list.Update()
$context.ExecuteQuery()

错误：

新对象：找不到类型 [Microsoft.SharePoint.Client.SharePointOnlineCredentials]：验证 已加载包含此类型的程序集。在 C:\Users\chauda31\OneDrive-Centrica\Documents\SharePointPS.ps1:18 字符：16 + ... edentials=新对象Microsoft.SharePoint.Client.SharePointOnlineCr。。。 + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +CategoryInfo:InvalidType:（：）[New Object]，pArgumentException +FullyQualifiedErrorId:TypeNotFound，Microsoft.PowerShell.Commands.NewObjectCommand

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任何人都可以在此提供帮助。加载程序集时似乎存在问题。你能检查一下这两个dll的路径是否正确吗？是的，我检查过了，dll是否正确。你试过用不同的方式加载它们吗？像使用

[System.Reflection.Assembly]：：LoadFile

。你可以看看博客，也许你可以更接近解决方案。