网络API POST主体对象总是空 [英] web-api POST body object always null

问题描述

我还在学习网络的API，如果我的问题听起来很愚蠢，所以原谅我。

I'm still learning web-api, so pardon me if my question sounds stupid.

我有这在我的StudentController

I have this in my StudentController

public HttpResponseMessage PostStudent([FromBody]Models.Student student)
        {
            if (DBManager.createStudent(student) != null)
                return Request.CreateResponse(HttpStatusCode.Created, student);
            else
                return Request.CreateResponse(HttpStatusCode.BadRequest, student);
        }

为了测试是否这是工作，我使用谷歌Chrome浏览器的扩展名邮差构建HTTP POST请求来测试它。

In order to test if this is working, I'm using Google Chrome's extension "Postman" to construct the HTTP POST request to test it out.

这是我的原POST请求：

This is my raw POST request:

POST /api/Student HTTP/1.1
Host: localhost:1118
Content-Type: application/json
Cache-Control: no-cache

{"student": [{"name":"John Doe", "age":18, "country":"United States of America"}]}

学生应该是一个对象，但是当我调试应用程序，该API接收了学生对象，但内容始终是NULL。

"student" is supposed to be an object, but when I debug the application, the api receives the student object but the content is always NULL.

推荐答案

FromBody是在一个陌生属性输入POST值需要在一个特定的格式对参数为非空，当它不是原始类型。 （这里的学生）

FromBody is a strange attribute in that the input POST values need to be in a specific format for the parameter to be non-null, when it is not a primitive type. (student here)

1. 尝试与您的要求{名：李四，时代：18日，国：美利坚合众国} 作为JSON 。


2. 删除FromBody属性，并尝试解决方案。它应该工作的非原始类型。 （学生）


3. 随着FromBody属性的另一种选择是发送值 =值格式，而不是的key = value 格式。这将意味着你的核心价值学生应该是一个空字符串...

1. Try your request with {"name":"John Doe", "age":18, "country":"United States of America"} as the json.
2. Remove the FromBody attribute and try the solution. It should work for non-primitive types. (student)
3. With the FromBody attribute, the other option is to send the values in =Value format, rather than key=value format. This would mean your key value of student should be an empty string...

还有其他选项，以写为学生类的自定义模型绑定，并与您的自定义属性粘结剂的参数。

There are also other options to write a custom model binder for the student class and attribute the parameter with your custom binder.

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