Web API C# 中的 POST 请求

Question

I'm new in working with ASP.net. I have problem with POST request. Perhaps my code is wrong, I don't find where !

Postman sends me the error message when I try a post request :

"ExceptionType":"System.Net.Http.UnsupportedMediaTypeException","StackTrace":" à System.Net.Http.HttpContentExtensions.ReadAsAsync[T](HttpContent content, Type type, IEnumerable 1 formatters, IFormatterLogger formatterLogger, CancellationToken cancellationToken)\\r\\n à System.Web.Http.ModelBinding.FormatterParameterBinding.ReadContentAsync(HttpRequestMessage request, Type type, IEnumerable 1 formatters, IFormatterLogger formatterLogger, CancellationToken cancellationToken)"}

Here is my code :

// POST: api/Boooks
[Route("~/api/PostCreate")]
public IHttpActionResult Post([FromBody] Books books)
{
    if (!ModelState.IsValid)
        return BadRequest("Invalid data.");

Answer 1

If you left it at default, then you will probably find that you need to set the application content type in post man as part of your headers info.

By Default I think asp.net core expects the content type to be of application/json. and your post man call is most likely sending it as text/html.

See your headers sent, make the changes and see the results.

Answer 2

Check your request headers in Postman!

You should not have to change anything in the c# code, it should accept JSON by default.