asp.net core webapi处理Post请求中的request payload

request payload的Content-Type实际上是text/plain的，如果请求的 Content-Type 为 application/json，这将导致415 Unsupported Media Type HTTP error。

有两个解决方法

1使用  application/json

Content-Type采用application/json并确保 request payload是有效的json格式，比如

  {
     "cookie": "value"
 } 

Then the action signature needs to accept an object with the same shape as the JSON object.

创建实体作为接收参数

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

 ...

 public IActionResult GetRankings([FromBody] CookieWrapper c)

或者使用dynamic、Dictionary

 public IActionResult GetRankings([FromBody] dynamic c) 

 public IActionResult GetRankings([FromBody] Dictionary<string, string> c) 

2使用 text/plain

客户端请求使用 Content-Type ： text/plain，服务端添加TextPlainInputFormatter

 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<InputFormatterResult> 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);
     }
 }

并在Startup.cs配置mvc

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

翻译自https://stackoverflow.com/questions/41798814/asp-net-core-api-post-parameter-is-always-null

作者：B.it

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