Azure Automation Webhook无法在PowerShell中传递参数求助

在Azure自动化账户中部署了PowerShell脚本Runbook（测试过PowerShell 5.1和7.2版本），脚本参数定义如下：

#set arguments
param(
    [string]$Origin,
    [string]$title,
    [string]$Description
)

直接在Azure中执行脚本时可正常传入参数，但通过以下PowerShell脚本触发Runbook的Webhook并传递参数时，脚本无法解析参数：

# Define the parameters
$params = @{
    "ORIGIN" = "value1"
    "TITLE" = "value2"
    "DESCRIPTION" = "value3"
}

# Convert the parameters to a JSON string
$jsonParams = $params | ConvertTo-Json

try {
    # Invoke the webhook
    Invoke-RestMethod -Method Post -Uri $webhookUrl -Body $jsonParams -ContentType "application/json"
} catch {
    Write-Host "Error: $_"
}

Runbook日志显示Webhook已触发，输入内容如下：

{"WebhookName":"CreateItem","RequestBody":"{\r\n \"TITLE\": \"value2\",\r\n \"DESCRIPTION\": \"value3\",\r\n \"ORIGIN\": \"value1\"\r\n}","RequestHeader":{"Connection":"Keep-Alive","Host":"0117e8aa-9b60-4cb6-b844-2f558f86d135.webhook.we.azure-automation.net","User-Agent":"Mozilla/5.0","x-ms-request-id":"cdb71f35-c396-4f05-801a-b4cc155c146b"}}

但脚本输出参数时结果均为空：

Using as my the origin
Using as the title
Using the following description:

1. 修正参数大小写匹配问题 #

Azure自动化Runbook的参数名区分大小写，当前传递的参数是全大写（ORIGIN、TITLE、DESCRIPTION），但Runbook定义的参数是混合大小写（$Origin、$title、$Description），两者不匹配导致无法映射。

修改触发脚本中的参数名，与Runbook定义保持一致：

# Define the parameters (匹配Runbook的参数大小写)
$params = @{
    "Origin" = "value1"
    "title" = "value2"
    "Description" = "value3"
}

# Convert the parameters to a JSON string
$jsonParams = $params | ConvertTo-Json

try {
    # Invoke the webhook
    Invoke-RestMethod -Method Post -Uri $webhookUrl -Body $jsonParams -ContentType "application/json"
} catch {
    Write-Host "Error: $_"
}

2. 在Runbook中显式解析Webhook请求体 #

如果希望保持参数传递的灵活性，可在Runbook中直接读取Webhook的请求体并解析，不依赖自动参数映射。修改Runbook脚本如下：

# 读取并解析Webhook请求体
$webhookInput = $WebhookData.RequestBody | ConvertFrom-Json

# 提取参数
$Origin = $webhookInput.Origin
$title = $webhookInput.title
$Description = $webhookInput.Description

# 后续业务逻辑示例
Write-Output "Using $Origin as my the origin"
Write-Output "Using $title as the title"
Write-Output "Using the following description: $Description"

注意：$WebhookData变量仅在Webhook触发Runbook时存在，需确保Runbook已启用Webhook支持。

验证要点 #

• 确认Webhook请求体的JSON参数名与Runbook定义完全匹配（包括大小写）
• 在Runbook中临时输出$WebhookData的完整内容，排查输入是否正确接收
• 检查Runbook日志中的RequestBody字段，确认参数结构无误

内容的提问来源于stack exchange，提问作者vulkoek