将正文中的 json 数据发布到 Web api [英] Post json data in body to web api

问题描述

为什么我总是从 body 得到 null 值?我使用 fiddler 没有问题，但邮递员失败了.

I get always null value from body why ? I have no problem with using fiddler but postman is fail.

我有一个这样的 web api:

I have a web api like that:

    [Route("api/account/GetToken/")]
    [System.Web.Http.HttpPost]
    public HttpResponseBody GetToken([FromBody] string value)
    {
        string result = value;
    }

我的邮递员数据:

和标题:

推荐答案

WebAPI 正在按预期工作，因为您告诉它您正在发送此 json 对象:

WebAPI is working as expected because you're telling it that you're sending this json object:

{ "username":"admin", "password":"admin" }

然后您要求它将其反序列化为 string 这是不可能的，因为它不是有效的 JSON 字符串.

Then you're asking it to deserialize it as a string which is impossible since it's not a valid JSON string.

解决方案 1:

如果您想接收 value 中的实际 JSON，则为:

If you want to receive the actual JSON as in the value of value will be:

value = "{ "username":"admin", "password":"admin" }"

那么你需要在邮递员中设置请求正文的字符串是:

then the string you need to set the body of the request in postman to is:

"{ "username":"admin", "password":"admin" }"

解决方案 2(我假设这就是您想要的):

Solution 2 (I'm assuming this is what you want):

创建一个匹配 JSON 的 C# 对象，以便 WebAPI 可以正确反序列化它.

Create a C# object that matches the JSON so that WebAPI can deserialize it properly.

首先创建一个与您的 JSON 匹配的类:

First create a class that matches your JSON:

public class Credentials
{
    [JsonProperty("username")]
    public string Username { get; set; }

    [JsonProperty("password")]
    public string Password { get; set; }
}

然后在你的方法中使用这个:

Then in your method use this:

[Route("api/account/GetToken/")]
[System.Web.Http.HttpPost]
public HttpResponseBody GetToken([FromBody] Credentials credentials)
{
    string username = credentials.Username;
    string password = credentials.Password;
}

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