我有用于Web API的 LoansController
I have this LoansController for a web api
[Route("api/[controller]")] [ApiController] public class LoansController : ControllerBase { // GET api/values [HttpGet] public ActionResult<IEnumerable<string>> Get() { return new string[] { "value1", "value2" }; } // POST api/loans [HttpPost] public void Post([FromBody] string value) { } }在PowerShell中,我可以致电
In PowerShell I can call
Invoke-WebRequest localhost:1113/api/loans -Body $postParams -Method Get,它工作正常(我得到 value1 和 value2 )
and it works fine (I get value1 and value2)
但是当我尝试
$postParams = "{'value':'123'}" Invoke-WebRequest localhost:1113/api/loans -Body $postParams -Method Post # -ContentType 'Application/json'我一直都在获得
Invoke-WebRequest:远程服务器返回错误:(400)错误的请求.
Invoke-WebRequest : The remote server returned an error: (400) Bad Request.
我在做什么错了?
我尝试添加 -ContentType'Application/json',但没有区别
I tried adding -ContentType 'Application/json' but it made no difference
我想念什么?
我也尝试了 Invoke-RestMethod ,但结果相同.
I also tried Invoke-RestMethod but with the same results..
接下来,我从 value 参数中删除了 [FromBody] ,但是 value 现在以 null 的形式出现>
Next I removed [FromBody] from the value param but value now comes in as null
推荐答案原因
这只是发生,因为您的操作方法期望HTTP请求的正文中出现简单的 string :
It just happens because your action method is expecting a plain string from HTTP request's Body:
[HttpPost] public void Post([FromBody] string value) { }这里的普通字符串是由用" 引用的一系列字符.换句话说,要表示字符串,在向此操作方法发送请求时,您需要在这些字符之前和之后加引号.
如果您确实希望将json字符串 {'value':'123'} 发送到服务器,则应使用以下有效负载:
If you do want to send the json string {'value':'123'} to server, you should use the following payload :
POST localhost:1113/api/loans HTTP/1.1 Content-Type: application/json "{'value':'123'}"注意:我们必须使用双引号字符串!没有"
如何修复
要发送纯字符串,只需使用以下 PowerShell 脚本: $postParams = "{'value':'123'}" $postParams = '"'+$postParams +'"' Invoke-WebRequest localhost:1113/api/loans -Body $postParams -Method Post -ContentType 'application/json'
或者,如果您想使用json发送有效载荷,则可以创建一个 DTO 来保存 value 属性:
public class Dto{ public string Value {get;set;} }并将您的操作方法更改为:
and change your action method to be :
[HttpPost] public void Post(Dto dto) { var value=dto.Value; }最后,您可以调用以下 PowerShell 脚本来发送请求:
Finally, you can invoke the following PowerShell scripts to send request :
$postParams = '{"value":"123"}' Invoke-WebRequest localhost:1113/api/loans -Body $postParams -Method Post -ContentType 'application/json'
这两种方法对我来说都完美无缺.
These two approaches both work flawlessly for me.
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(400)尝试将简单值发布到API时出现错误请求
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