Trying to deserialize Json object passed in body - json

Question

I'm kind of a fresher when it comes to doing API work especially with JSON.
Here's what my code looks like...
Endpoing:
[HttpPost("postWithBody")]
public async Task<IActionResult> PostWithBody (string param1, [FromBody] object requestBody)
{
var x = JsonSerializer.Deserialize<ParamModel>(requestBody); <-- Error cannot convert from 'object' to System.ReadOnlySpan<byte>
return ok(param1); <--this here just so it doesn't bark at me
}
SO in the above code, I'm erroring out on (RequestBody) with this error:
Error cannot convert from 'object' to System.ReadOnlySpan
public class ParamModel
{
public string PName {get;set;}
public string PValue {get;set;}
}
But essentially to finish the demo of what I'm trying to accomplish is, goal is to pass JSON value to this endpoint in the body that looks like this:
{
"Param1": "XXX",
"Param2": "111"
}
and my goal would be for CustomParams model class to have the
PName = Param1
PValue = "XXX"
and
PName = "Param2"
PValue = "111"
Is this the correct approach I'm taking?
Thank you.
EDIT: I guess I could do something like: [FromBody] ParamModel requestBody
and I did try it, when I pass JSON like this, it came as null in the endpoint:
{"test":"hey"}
But also, I probably would need to do something like this, since I want to have the option of passing multiple params.
public class ParamList
{
public List<ParamModel> data {get;set;}
}
and have that be [FromBody] ParamList requestBody

Answer 1

First of all I would suggest that you use the model in the action parameter and let the framework do the deserialisation for you:
public async Task<IActionResult> PostWithBody(
string param1, [FromBody] ParamModel requestBody)
Now you will be able to post JSON in that matches that object, something like this for example:
{
"PName": "test",
"PValue": "hey"
}
In your update, you say that you would like instead to use the ParamList object. In that case, you would need JSON that matches, something like this:
{
"data": [
{ "PName": "test1", "PValue": "hey1" },
{ "PName": "test2", "PValue": "hey2" }
]
}
Now in your action you can loop over the list like this:
foreach(var param in requestBody.data)
{
var paramName = param.PName;
var paramValue = param.PValue;
// etc.
}