为什么在期望POST主体中的数据时需要FromBody属性 [英] Why do I need FromBody Attribute when expecting data in POST body

问题描述

我可以将数据发送到服务器，但仅限于使用FromBody-Attribute时。

I can send my data to the server but ONLY when I use the FromBody-Attribute.

为什么不使用帖子自动从主体读取json数据？

Why is the json data not automatically read from the Body using a Post?

后端网络API

[HttpPost]
public async Task<IActionResult> Post([FromBody]CreateSchoolyearRequestDTO dto)
{

}

前端angularjs

this.createSchoolyear = function (schoolyear) {
  var path = "/api/schoolyears";
  return $http({
      url: path,
      method: "POST",
      data:  schoolyear,
      contentType: "application/json"
  }).then(function (response) {
      return response;
  });
};

推荐答案

因为某些事情是POST请求，所以没有明确规则如何转移参数。 POST请求仍然可以包含URL中编码的查询参数。方法参数应该是简单类型（字符串，整数等）的查询参数。

Just because something is a POST request, there is no clear rule how arguments are being transferred. A POST request can still contain query parameters encoded in the URL. A method parameter is expected to be a query parameter for "simple" types (strings, ints, etc.).

复杂类型通常应该是POST表单对象。标准的ASP.NET POST请求是表单提交，例如登录时。这些请求中的参数通常编码为 application / x-www-form-urlencoded ，基本上是一串键/值对。对于复杂的参数类型，例如表单视图模型对象，这被假定为默认值。

Complex types are usually expected to be POST form objects. The standard ASP.NET POST request is a form submit, e.g. when logging in. The parameters in those request are usually encoded as application/x-www-form-urlencoded, basically a string of key/value pairs. For complex parameter types, e.g. form view model objects, this is assumed the default.

对于所有其他非默认情况，您需要明确方法参数的来源，方式如何在请求中转移。为此，有许多不同的属性：

For all other non-default situations, you need to be explicit where a method parameter comes from, how it is being transferred in the request. For that purpose, there are a number of different attributes:

• FromBodyAttribute - For来自请求正文的参数


• FromFormAttribute - 对于来自单个表单数据字段的参数


• FromHeaderAttribute - 对于来自HTTP标头字段的参数


• FromQueryAttribute - 对于来自URL中编码的查询参数的参数


• FromRouteAttribute - 对于来自路径数据的参数


• FromServicesAttribute - 对于应在方法级注入服务的参数

• FromBodyAttribute – For parameters that come from the request body
• FromFormAttribute – For parameters that come from a single form data field
• FromHeaderAttribute – For parameters that come from a HTTP header field
• FromQueryAttribute – For parameters that come from a query argument encoded in the URL
• FromRouteAttribute – For parameters that come from the route data
• FromServicesAttribute – For parameters for which services should be injected at method-level

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