c#API“解析值时遇到意外字符:S.路径"，第0行，位置0"； [英] c# API "Unexpected character encountered while parsing value: S. Path '', line 0, position 0"

问题描述

我使用c#编码的多个API，效果很好.我想使用一个接收匿名对象的对象(我不想创建一个类).尝试反序列化对象时遇到问题.

I use multiple API coded in c# that works well. I want to use one receiving an anonymous object (I don't want to create a Class). I have a problem when I try to deserialize the object.

我有一个遵循此方案的API，当使用json_dumps函数从python调用它时，它可以很好地工作.但是，当我尝试使用JSON.stringify(来自a甚至是POSTMAN时，我有一个400错误的请求.

I have an API following this scheme, it works well when it's called from python using the json_dumps function. But when I try with JSON.stringify (from an a or even POSTMAN, I have a 400 bad request.

这是我的代码，我已经尝试了很多事情:

Here is my code, I have tried a lot of things :

[WebInvoke(Method = "POST", UriTemplate = "myUrl")]
[OperationContract]
public Message myMethod(object objectSentByUser)
{

    var perso = JsonConvert.DeserializeObject<dynamic>(objectSentByUser.ToString());

JsonConvert.DeserializeObject<dynamic>等待一个字符串，我尝试过:

JsonConvert.DeserializeObject<dynamic> waits for a string, I tried:

-在myMethod的参数中将objectSentByUser指定为字符串 这样做的时候，我什至没有输入方法就得到了400(我尝试发送JSON，添加引号，发送字符串等...)

-to specify objectSentByUser as a string in the argument of myMethod When I do so, I've got a 400 without even entering the method (I tried to send a JSON, to add quotes, to send a string etc...)

-使用(string)objectSentByUser进行投射，不起作用

-to cast with (string)objectSentByUser, it doesn't work

-使用toString()方法，这将导致下一个错误: 解析值时遇到意外字符:S.路径"，第0行，位置0 这是很正常的，因为objectSentByUser.toString()返回"System.Object" (但是为什么在与python json_dump一起使用时能起作用?)

-to use the toString() method, which leads to the next error: Unexpected character encountered while parsing value: S. Path '', line 0, position 0 which is quite normal because objectSentByUser.toString() returns "System.Object" (but why does it work when used with python json_dump?)

此代码在通过python函数json_dump调用时有效，该函数返回这样的对象:

This code works when called with python function json_dump that returns an object like this:

"{\\" key1 \\:\\" value1 \\，...}"

"{\\"key1\\":\\"value1\\",...}"

我从邮递员发送了一个经典的POST，其中application/json为contentType，并且正文中包含有效的JSON(已在另一个关于stackoverflow的讨论中找到的网站上进行了验证)

From Postman I send a classic POST with application/json as contentType and a valid JSON in the body (verified on a website found in an another discussion on stackoverflow)

非常感谢您的帮助

再见

推荐答案

如果用户向您的操作发送了有效的json字符串，则不接受对象作为参数，而是接受字符串(即，因为您的用户发送了你一个).

If the user sends a valid json string to your action, then don't accept an object as a parameter, but rather a string (i.e. because your user sends you one).

如果在对象上调用ToString()，则可能不是Json格式.

If you call ToString() on an object, chances are, it's not in a Json format.

尝试接受一个字符串并将其反序列化:

Try accepting a string and deserializing that:

[WebInvoke(Method = "POST", UriTemplate = "myUrl")]
[OperationContract]
public Message myMethod(string jsonSentByUser)
{

    var perso = JsonConvert.DeserializeObject<dynamic>(jsonSentByUser);

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