Html 变量上的Null参数

我正在尝试使用PowerShell运行MySQL脚本，并将输出转换为HTML文件或通过电子邮件发送输出。 但是，存储输出的变量有问题

代码运行得很好，因为我能够输出结果，但它无法移动到HTML或电子邮件

#The dataset must be created before it can be used in the script:
$dataSet = New-Object System.Data.DataSet 

#MYSQL query
$command = $myconnection.CreateCommand()
$command.CommandText = "
SELECT ID, Date_Close, Time_Close FROM systemcontrol.database_close
WHERE Date_Close >= CONCAT(YEAR(NOW()), '-', MONTH(NOW()), '-01')
AND Database_Close_ID = 1
ORDER BY Date_Close DESC
";

Write-Host "4B - Sales Reports Month End Database"

$reader = $command.ExecuteReader()
#The data reader will now contain the results from the database query.

#Processing the Contents of a Data Reader
#The contents of a data reader is processes row by row:
while ($reader.Read()) {
  #And then field by field:
  for ($i= 0; $i -lt $reader.FieldCount; $i++) {
    Write-Output $reader.GetValue($i).ToString() 
  }
}

ConvertTo-Html -Body "$reader" -Title "4B - Sales Reports Month End Database" | Out-File C:\************.HTML

Send-MailMessage -From " Daily Check <server@company.com>" -To "Admin <admin@admin>" -Subject "Daily Check: Server Times" -Body "$reader" -Priority High -Dno onSuccess, onFailure -SmtpServer 1.xx.xx.xx

$myconnection.Close()

这就是我得到的错误：

无法验证参数“Body”上的参数。参数为null或为空。请提供一个不为null或空的参数，然后重试该命令

它似乎无法识别$reader变量。这里哪里出错了？

您正在向-body参数传递一个SqlDataReader对象，该参数需要字符串[]。只需在$result数组中收集while循环中的值，并将其传递给主体：

#The dataset must be created before it can be used in the script:
$dataSet = New-Object System.Data.DataSet 

#MYSQL query
$command = $myconnection.CreateCommand()
$command.CommandText = "
SELECT ID, Date_Close, Time_Close FROM systemcontrol.database_close
WHERE Date_Close >= CONCAT(YEAR(NOW()), '-', MONTH(NOW()), '-01')
AND Database_Close_ID = 1
ORDER BY Date_Close DESC
";

Write-Host "4B - Sales Reports Month End Database"

$reader = $command.ExecuteReader()
#The data reader will now contain the results from the database query.

$result = @()

#Processing the Contents of a Data Reader
#The contents of a data reader is processes row by row:
while ($reader.Read()) {
  #And then field by field:
  for ($i= 0; $i -lt $reader.FieldCount; $i++) {
    $value = $reader.GetValue($i).ToString() 
    Write-Output $value
    $result += $value
  }
}

ConvertTo-Html -Body $result -Title "4B - Sales Reports Month End Database" | Out-File C:\************.HTML

Send-MailMessage -From " Daily Check <server@company.com>" -To "Admin <admin@admin>" -Subject "Daily Check: Server Times" -Body "$reader" -Priority High -Dno onSuccess, onFailure -SmtpServer 1.xx.xx.xx

$myconnection.Close()