PowerShell中iCal.Net组件加载失败：如何定位并加载.dll文件

使用PowerShell结合iCal.Net包读取.ics文件时，执行以下操作后创建Calendar对象报错：

# install ical.net dependencies
Install-Package NodaTime -Force

# install ical.net package
Install-Package iCal.Net -Force

# variables
$icsfile = "C:\Users\Windows\Desktop\ical\caalendar.ical"
$icsurl = "https://url_to_download/basic.ics"

# download ics file
Invoke-WebRequest $icsurl -OutFile $icsfile

# create new calendar object
$calendar = New-Object Ical.Net.Calendar

报错信息：

New-Object : Cannot find type [Ical.Net.Calendar]: verify that the assembly containing this type is loaded.
At line:1 char:13
+ $calendar = New-Object Ical.Net.Calendar
+             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidType: (:) [New-Object], PSArgumentException
    + FullyQualifiedErrorId : TypeNotFound,Microsoft.PowerShell.Commands.NewObjectCommand

已安装iCal.Net包但未加载对应程序集，需定位并加载.dll文件。

1. 定位iCal.Net及依赖的.dll文件 #

Install-Package默认将包安装到当前用户的NuGet目录，可通过以下命令自动查找最新版本的.dll：

# 查找最新版Ical.Net.dll
$icalDll = Get-ChildItem -Path "$env:USERPROFILE\.nuget\packages\ical.net" -Recurse -Filter "Ical.Net.dll" | Sort-Object LastWriteTime -Descending | Select-Object -First 1 -ExpandProperty FullName

# 查找最新版NodaTime.dll（iCal.Net的依赖）
$nodaTimeDll = Get-ChildItem -Path "$env:USERPROFILE\.nuget\packages\nodatime" -Recurse -Filter "NodaTime.dll" | Sort-Object LastWriteTime -Descending | Select-Object -First 1 -ExpandProperty FullName

2. 加载程序集 #

找到路径后用Add-Type加载：

Add-Type -Path $nodaTimeDll
Add-Type -Path $icalDll

3. 完整修正后的脚本 #

# 安装依赖包
Install-Package NodaTime -Force
Install-Package iCal.Net -Force

# 查找并加载程序集
$icalDll = Get-ChildItem -Path "$env:USERPROFILE\.nuget\packages\ical.net" -Recurse -Filter "Ical.Net.dll" | Sort-Object LastWriteTime -Descending | Select-Object -First 1 -ExpandProperty FullName
$nodaTimeDll = Get-ChildItem -Path "$env:USERPROFILE\.nuget\packages\nodatime" -Recurse -Filter "NodaTime.dll" | Sort-Object LastWriteTime -Descending | Select-Object -First 1 -ExpandProperty FullName
Add-Type -Path $nodaTimeDll
Add-Type -Path $icalDll

# 下载ICS文件
$icsfile = "C:\Users\Windows\Desktop\ical\caalendar.ical"
$icsurl = "https://url_to_download/basic.ics"
Invoke-WebRequest $icsurl -OutFile $icsfile

# 读取并解析ICS文件（使用iCal.Net提供的静态方法更便捷）
$calendar = [Ical.Net.Calendar]::LoadFromFile($icsfile)

补充说明 #

• LoadFromFile是iCal.Net官方提供的静态方法，直接从文件加载解析日历，比手动创建Calendar对象更高效。
• 手动加载NodaTime.dll可避免PowerShell自动加载依赖时可能出现的版本不匹配问题。

内容的提问来源于stack exchange，提问作者aristosv