ASP.NET Core API POST参数始终为null

我看过以下内容:

Asp.net Core Post参数始终为null

asp.net webapi 2 post参数始终为null

web-api POST正文对象始终为null

Web Api参数始终为null

我的终点:

[HttpPost]
[Route("/getter/validatecookie")]
public async Task GetRankings([FromBody] string cookie)
{
    int world = 5;
    ApiGetter getter = new ApiGetter(_config, cookie);
    if (!await IsValidCookie(getter, world))
    {
        return BadRequest("Invalid CotG Session");
    }
    HttpContext.Session.SetString("cotgCookie", cookie);
    return Ok();
}

我的请求:

$http.post(ENDPOINTS["Validate Cookie"],  cookie , {'Content-Type': 'application/json'});

cookie我从用户输入发送的字符串在哪里.

请求使用适当的数据发布到端点.但是,我的字符串始终为null.我已经尝试删除[FromBody]标记,并=在发布的数据前添加一个没有运气.我还尝试使用上述所有组合添加和删除不同的内容类型.

我正在做这个具体行动的原因很长,对这个问题无关紧要.

无论我做什么,为什么我的参数总是为null？

编辑:我也尝试过使用 {cookie: cookie}

Edit2:请求:

Request URL:http://localhost:54093/getter/validatecookie
Request Method:POST
Status Code:400 Bad Request
Remote Address:[::1]:54093

响应标题

Content-Type:text/plain; charset=utf-8
Date:Mon, 23 Jan 2017 03:12:54 GMT
Server:Kestrel
Transfer-Encoding:chunked
X-Powered-By:ASP.NET
X-SourceFiles:=?UTF-8?B?QzpcVXNlcnNcRG91Z2xhc2cxNGJcRG9jdW1lbnRzXFByb2dyYW1taW5nXENvdEdcQ290RyBBcHBcc3JjXENvdEdcZ2V0dGVyXHZhbGlkYXRlY29va2ll?=

请求标题

POST /getter/validatecookie HTTP/1.1
Host: localhost:54093
Connection: keep-alive
Content-Length: 221
Accept: application/json, text/plain, */*
Origin: http://localhost:54093
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36
Content-Type: application/json;charset=UTF-8
Referer: http://localhost:54093/
Accept-Encoding: gzip, deflate, br
Accept-Language: en-US,en;q=0.8

请求有效负载

=sec_session_id=[redacted]; _ga=[redacted]; AWSELB=[redacted]

Shaun Luttin.. 38

问题是,Content-Type是application/json,而请求负载实际上是text/plain.这将导致415 Unsupported Media Type HTTP错误.

您至少有两个选项可以对齐当前Content-Type和实际内容.

使用application/json

保留Content-Typeas application/json并确保请求有效负载是有效的JSON.例如,将您的请求有效负载设为:

{
    "cookie": "=sec_session_id=[redacted]; _ga=[redacted]; AWSELB=[redacted]"
} 

然后,操作签名需要接受与JSON对象具有相同形状的对象.

public class CookieWrapper
{
    public string Cookie { get; set; }
}

而不是CookieWrapper类,或者你可以接受动态,或者Dictionary像cookie["cookie"]端点一样访问它

public IActionResult GetRankings([FromBody] CookieWrapper cookie)

public IActionResult GetRankings([FromBody] dynamic cookie)

public IActionResult GetRankings([FromBody] Dictionary cookie)

使用text/plain

另一种方法是将您更改Content-Type为text/plain并向项目中添加纯文本输入格式化程序.为此,请创建以下类.

public class TextPlainInputFormatter : TextInputFormatter
{
    public TextPlainInputFormatter()
    {
        SupportedMediaTypes.Add("text/plain");
        SupportedEncodings.Add(UTF8EncodingWithoutBOM);
        SupportedEncodings.Add(UTF16EncodingLittleEndian);
    }

    protected override bool CanReadType(Type type)
    {
        return type == typeof(string);
    }

    public override async Task ReadRequestBodyAsync(
        InputFormatterContext context, 
        Encoding encoding)
    {
        string data = null;
        using (var streamReader = context.ReaderFactory(
            context.HttpContext.Request.Body, 
            encoding))
        {
            data = await streamReader.ReadToEndAsync();
        }

        return InputFormatterResult.Success(data);
    }
}

并配置Mvc使用它.

services.AddMvc(options =>
{
    options.InputFormatters.Add(new TextPlainInputFormatter());
});

也可以看看

https://github.com/aspnet/Mvc/issues/5137

1> Shaun Luttin..：

---

问题是,Content-Type是application/json,而请求负载实际上是text/plain.这将导致415 Unsupported Media Type HTTP错误.

您至少有两个选项可以对齐当前Content-Type和实际内容.

使用application/json

保留Content-Typeas application/json并确保请求有效负载是有效的JSON.例如,将您的请求有效负载设为:

{
    "cookie": "=sec_session_id=[redacted]; _ga=[redacted]; AWSELB=[redacted]"
} 

然后,操作签名需要接受与JSON对象具有相同形状的对象.

public class CookieWrapper
{
    public string Cookie { get; set; }
}

而不是CookieWrapper类,或者你可以接受动态,或者Dictionary像cookie["cookie"]端点一样访问它

public IActionResult GetRankings([FromBody] CookieWrapper cookie)

public IActionResult GetRankings([FromBody] dynamic cookie)

public IActionResult GetRankings([FromBody] Dictionary cookie)

使用text/plain

另一种方法是将您更改Content-Type为text/plain并向项目中添加纯文本输入格式化程序.为此,请创建以下类.

public class TextPlainInputFormatter : TextInputFormatter
{
    public TextPlainInputFormatter()
    {
        SupportedMediaTypes.Add("text/plain");
        SupportedEncodings.Add(UTF8EncodingWithoutBOM);
        SupportedEncodings.Add(UTF16EncodingLittleEndian);
    }

    protected override bool CanReadType(Type type)
    {
        return type == typeof(string);
    }

    public override async Task ReadRequestBodyAsync(
        InputFormatterContext context, 
        Encoding encoding)
    {
        string data = null;
        using (var streamReader = context.ReaderFactory(
            context.HttpContext.Request.Body, 
            encoding))
        {
            data = await streamReader.ReadToEndAsync();
        }

        return InputFormatterResult.Success(data);
    }
}

并配置Mvc使用它.

services.AddMvc(options =>
{
    options.InputFormatters.Add(new TextPlainInputFormatter());
});

也可以看看

https://github.com/aspnet/Mvc/issues/5137

---

得到它... ASP.NET Core不支持`text/plain`作为`Content-Type`开箱即用.

---

这应该不是答案.你可以在.Net Core中轻松发送一个字符串而不需要这些jiggery pokery.请参阅下面的答案

2> statler..：

---

Shaun Luttin的答案有效,但它遗漏了一条重要的信息.无法识别字符串的原因是因为它不是JSON字符串.

做这个;

var payload=JSON.stringify("=sec_session_id=[redacted]; _ga=[redacted]; AWSELB=[redacted]");

然后你可以按原样离开控制器;

$.ajax({
    url: http://localhost:54093/getter/validatecookie,
    type: 'POST',
    contentType: 'application/json',
    data: payload
});

令我尴尬的是,这让我想出了多长时间.我真的希望它可以帮助别人!