使用 System.Net.WebClient.DownloadFile 下載文件時顯示已損壞

Question

我將一個文件上傳到雲，它給了我直接下載鏈接。

通過單擊此鏈接下載它可以正常工作，但是當我嘗試通過 Powershell 上的System.Net.WebClient.DownloadFile下載它時，它會下載文件，但是當我打開它時，它說文件已損壞且無法讀取。

那是代碼：

$WebClient = New-Object System.Net.WebClient
$WebClient.DownloadFile("https://xxxxxx.com/xxxxx/xxx.exe","C:\Users\user\Desktop\xxx.exe")

有什么解決辦法嗎？

Answer 1

奇怪，這個邏輯對我有用。

您可以嘗試添加$WebClient.Dispose()嗎？

或其他PowerShell下載方法如：

$uri = "https://xxxxxx.com/xxxxx/xxx.exe"
$path = "C:\Users\user\Desktop\xxx.exe"

Invoke-WebRequest -Uri $uri -OutFile $path

Answer 2

使用 PowerShell 下載文件的 3 種方法

<#
# 1. Invoke-WebRequest

The first and most obvious option is the Invoke-WebRequest cmdlet. It is built
into PowerShell and can be used in the following method:
#>

$url = "http://mirror.internode.on.net/pub/test/10meg.test"
$output = "$PSScriptRoot\10meg.test"
$start_time = Get-Date
Invoke-WebRequest -Uri $url -OutFile $output
Write-Output "Time taken: $((Get-Date).Subtract($start_time).Seconds) second(s)"

<#
2. System.Net.WebClient

A common .NET class used for downloading files is the System.Net.WebClient class.
#>

$url = "http://mirror.internode.on.net/pub/test/10meg.test"
$output = "$PSScriptRoot\10meg.test"
$start_time = Get-Date
$wc = New-Object System.Net.WebClient
$wc.DownloadFile($url, $output)

# OR

(New-Object System.Net.WebClient).DownloadFile($url, $output)
Write-Output "Time taken: $((Get-Date).Subtract($start_time).Seconds) second(s)"

<#
3. Start-BitsTransfer

If you haven't heard of BITS before, check this out. BITS is primarily designed
for asynchronous file downloads, but works perfectly fine synchronously too
(assuming you have BITS enabled).
#>

$url = "http://mirror.internode.on.net/pub/test/10meg.test"
$output = "$PSScriptRoot\10meg.test"
$start_time = Get-Date
Import-Module BitsTransfer
Start-BitsTransfer -Source $url -Destination $output

# Or

Start-BitsTransfer -Source $url -Destination $output -Asynchronous
Write-Output "Time taken: $((Get-Date).Subtract($start_time).Seconds) second(s)"

這是我個人每天使用的，來自通過我的個人資料導入的個人模塊中的 function。

$webclient = New-Object System.Net.WebClient
$url       = 'https://download.microsoft.com/download/B/A/4/BA4A7E71-2906-4B2D-A0E1-80CF16844F5F/dotNetFx45_Full_setup.exe'

$filename = [System.IO.Path]::GetFileName($url)
$file     = "$TechToolsUNC\$filename"

$webclient.DownloadFile($url,$file)
Start-Process $file -Wait

Answer 3

我推測他與 powershell 無關，而是您的機器或網絡上的其他因素，很可能是防病毒代理等。