Fetch, controller FromBody wrong-CodePudding

Im Fetching to change my Record and the value newInsert is in the fetch true but in the Controller its false.

Fetch:

fetch('api/Test/UpdateOrInsertType', {
            headers: { 'Content-Type': 'application/json' },
            method: 'POST',
            body: JSON.stringify({
                'newInsert': newInsert  //Console.log -> true
            })

Controller:

[HttpPost("UpdateOrInsertType")]
        public IActionResult UpdateOrInsertType([FromBody] bool newInsert) 
// Debugger newInsert -> false
        {
            try
            {
                return Ok(Test.UpdateOrInsertType(newInsert));
            }
            catch (Exception ex)
            {
                return Conflict(ex);
            }
        }

CodePudding user response：

Json doesn't work properly with primitive types. If you wont to use json.stringify you have to create a ViewModel

public class ViewModel
{
public bool NewInsert {get; set;}
}

and action

[HttpPost("UpdateOrInsertType")]
public IActionResult UpdateOrInsertType([FromBody] ViewModel model) 
{
bool newInsert=model.NewInsert

or you can remove { 'Content-Type': 'application/json' }

   fetch('api/Test/UpdateOrInsertType', {
   method: 'POST',
  body: { newInsert: newInsert } 
        })

and remove [FromBody]

[HttpPost("UpdateOrInsertType")]
 public IActionResult UpdateOrInsertType( bool newInsert)

CodePudding user response：

In this case you should not use JSON.stringify.

Simply pass the raw javascript object to fetch body:

fetch('api/Test/UpdateOrInsertType', {
            method: 'POST',
            body:
            {
                newInsert: newInsert
            }
        });

Now on server side it will be recognized as a bool property.