ASP.NET Core表单POST导致HTTP 415不受支持的媒体类型响应

Question

public class MyController : Controller
{
    [HttpPost]
    public async Task<IActionResult> Submit([FromBody] MyModel model)
    {
        //...
    }
}

POST /submit HTTP/1.1
Host: example.com:1337
Connection: keep-alive
Content-Length: 219
Pragma: no-cache
Cache-Control: no-cache
Origin: https://example.com:1337
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36
Content-Type: application/x-www-form-urlencoded
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Referer: https://example.com:1337/submit
Accept-Encoding: gzip, deflate, br
Accept-Language: en-US,en;q=0.8,nl;q=0.6

这以前适用于.NET 4.6上的ASP.NET MVC 5。

Answer 1

对于表单，请使用[FromForm]属性，而不是[FromBody]属性。

下面的控制器与ASP.NET Core 1.1一起工作：

public class MyController : Controller
{
    [HttpPost]
    public async Task<IActionResult> Submit([FromForm] MyModel model)
    {
        //...
    }
}

注意：如果您的控制器使用[ApiController]注释，则需要[FromXxx]。对于普通视图控制器，可以省略它。