Custom ASP.Net Core JSON model binder - asp.net-core

Question

My posted JSON object is this:
{{
"emails": [
{
"To": "info#gmail.com",
"Subject": "Subject",
"Body": "Body",
"ID": "d3d13242-6eff-4c57-b718-ef5ad49fe301"
},
{
"To": "hr#gmail.com",
"Subject": "Subject",
"Body": "Body",
"ID": "101edaf0-fcb4-48fc-9e9e-0d7492b591b0"
}
]
}}
By default ASP.NET model binder will not bind this JSON object and as you can see here I get always null when I send post request to the API:
[HttpPost, Route("Send")]
public async Task<IActionResult> Send(Email[] emails)
{
var toSave = from email in emails
select new EmailQueueItem
{
Html = true,
To = email.To,
Subject = email.Subject,
Body = email.Body
};
await Database.BulkInsert(toSave.ToArray());
return Ok();
}
emails property is always null. I would appreciate any help for creating custom model binder that handel this kind of JSON objects.

Answer 1

The issue is that you are actually sending an object containing one property named emails, not an array, to the controller
Option one:
The client object needs to contain just the array
[
{
"To": "info#gmail.com",
"Subject": "Subject",
"Body": "Body",
"ID": "d3d13242-6eff-4c57-b718-ef5ad49fe301"
},
{
"To": "hr#gmail.com",
"Subject": "Subject",
"Body": "Body",
"ID": "101edaf0-fcb4-48fc-9e9e-0d7492b591b0"
}
]
Then read the array from the request body
public async Task<IActionResult> Send([FromBody]Email[] emails)
Option 2:
When you define the array like this in the client
{
"emails":...
}
You need to match that object setup on the controller by defining a model which contains a property called emails
public class RequestModel
{
public Email[] emails { get; set; }
}
Then in the controller method, use the model and read it from the body
public async Task<IActionResult> Send([FromBody]RequestModel emails)