Postman插件将值[FromBody]传递给post方法时的空值

Null value when Pass values [FromBody] to post method by Postman plugin(Postman插件将值[FromBody]传递给post方法时的空值)

问题描述

我在 ASP.net Web API 中使用 api 控制器，我需要通过 [FromBody] 类型将值传递给 post 方法..

I use api controller in ASP.net web API and i need to pass value to post method by [FromBody] type..

 [HttpPost]
 public HttpResponseMessage Post( [FromBody]string name)
 {
     ....
 }

我使用 Postman 插件，但是当发送到 name 的 post 方法值始终为 null.. 遵循此图像:

i use Postman plugin but when send to post method value of name always is null.. follow this image:

在 Post 方法中:

and in Post methods :

为什么会这样?！

推荐答案

你不能使用 json 和 FromBody 绑定单个原始字符串，json 将传输一个对象，控制器将依次期望一个复杂对象(模型).如果您只想发送单个字符串，请使用 url 编码.

You can't bind a single primitive string using json and FromBody, json will transmit an object and the controller will expect an complex object (model) in turn. If you want to only send a single string then use url encoding.

在您的标题集上

Content-Type: application/x-www-form-urlencoded

POST 请求消息正文的正文应为 =saeed(基于您的测试值)，仅此而已.对于未知/变量字符串，您必须对值进行 URL 编码，这样您就不会意外地因输入字符而转义.

The body of the POST request message body should be =saeed (based on your test value) and nothing else. For unknown/variable strings you have to URL encode the value so that way you do not accidentally escape with an input character.

创建一个模型并使用它.

Create a model and use that instead.

消息正文值:{"name":"saeee"}

c#

public class CustomModel {
    public string Name {get;set;}
}

控制器方法

public HttpResponseMessage Post([FromBody]CustomModel model)

备用 2

使用 URI 而不是消息正文将原始字符串传递给您的帖子.

Alternate 2

Pass primitive strings to your post using the URI instead of the message body.

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