Post received by FromBody causes serializable error

Question

Here\'s the basic setup, I have an asp.net core webapi controller (in c#) with a post function like so:

[HttpPost]
public ActionResult Post([Fr         


        

Answer 1

The serializable error is actually a parsing error from JSON.NET, but the problem actually has nothing to do with parsing JSON.

The real issue is that ASP.NET Core expects to parse a JSON body into an object/DTO. So you have two options you can use to fix the problem:

1. Make a simple DTO container object for your single parameter e.g.:

   public class SimpleObject { 
       public string Name { get; set; } 
   }
   

2. Instead of passing a full fledged JSON object in your request body, just use a simple string e.g: "My parameter string"

Answer 2

You need a body in which json data will be parsed.

[FromBody] string Name

can not work with following json

{
    "Name": "Foo"
}

It needs a class

public class MyClass 
{ 
    public string Name;
}

Then pass it as

([FromBody] MyClass obj)

Or if it is single value, use JSON like

{
    [
       "Foo",
       "Foo1"
    ]
}

Then pass it as

([FromBody] List<string> obj)