Transfering the content of a text-file using JSON - powershell

Question

I am trying to POST an associative array to a web-service.
I create the array and I use Invoke-RestMethod to POST it:
$LogData = #{
"MyProperty" = "bla bla";
"LogText" = "This is my Text."
}
Invoke-RestMethod -Method Post -Uri $URL -Body ( $LogData | ConvertTo-JSON -Compress ) -ContentType "application/json"
This is working fine.
Now I want the property LogText to be dynamical and not static like in the example above.
I want to take the content of a text-file and therefore I use the code as above, but with Get-Content:
$LogData = #{
"MyProperty" = "bla bla";
"LogText" = Get-Content -Path $LogFile
}
This does not work. The text does not seem to be a String. It seems to be an object. If I have a closer look using the command $LogData.LogText | ConvertTo-JSON, I get an output like:
I did try to use the following, but this did not change the situation:
Get-Content -Path $LogFile -Raw
( Get-Content -Path $LogFile -Raw ).ToString()
How can I solve this?
Thank you

Answer 1

Get-Content attaches some metadata to it's output, and ConvertTo-Json (in Windows PowerShell at least) serializes the attached metadata instead of treating the underlying string as just a string.
You can force ConvertTo-Json to treat them as strings by explicitly typing the containing array:
$LogData = #{
"MyProperty" = "bla bla";
"LogText" = [string[]]#( Get-Content -Path $LogFile )
}
For scalar string values, you can create a new string using "":
$LogData = #{
"MyProperty" = "bla bla";
"LogText" = "$( Get-Content -Path $LogFile -Raw )"
}

Answer 2

Using the following lines of code did the trick:
$LogData = #{
"MyProperty" = "bla bla";
"LogText" = "$( Get-Content -Path $LogFile -Raw )"
}
Invoke-RestMethod -Method Post -Uri $URL -Body ( $LogData | ConvertTo-JSON -Compress ) -ContentType "application/json; charset=utf-8"
Most important thing was adding charset=utf-8 to the ContentType. Without it the webservice did "sometimes" respond with "405 Method Not Allowed".