C＃

 public class ValuesController : ApiController { // POST api/values [HttpPost] // added attribute public IHttpActionResult Post([FromBody] string filterName) // added FromBody as this is how you are sending the data { return new JsonResult(filterName, new JsonSerializerSettings(), Encoding.UTF8, this); } 

JavaScript的

 $.ajax( { url: "/api/Values/", // be consistent and case the route the same as the ApiController type: "POST", dataType: 'json', data: "=Dirty Deeds", // add an = sign success: function (result) { console.log(result); }, error: function (xhr, status, p3, p4) { var err = "Error " + " " + status + " " + p3; if (xhr.responseText && xhr.responseText[0] == "{") err = JSON.parse(xhr.responseText).message; console.log(err); } }); 

说明

因为您只发送一个值，所以在它前面添加=符号，因此它将被视为表单编码。 如果要明确这是您正在对ajax调用执行的操作，还可以添加内容类型。

 contentType: 'application/x-www-form-urlencoded' 

或者，您也可以通过URL发送内容或将内容包装在服务器上的对象以及ajax调用中并对其进行字符串化。

 public class Filter { public string FilterName {get;set;} } public class ValuesController : ApiController { // POST api/values [HttpPost] // added attribute public IHttpActionResult Post([FromBody] Filter filter) // added FromBody as this is how you are sending the data { return new JsonResult(filter.FilterName, new JsonSerializerSettings(), Encoding.UTF8, this); } 

JavaScript的

 $.ajax( { url: "/api/Values/", // be consistent and case the route the same as the ApiController type: "POST", dataType: 'json', contentType: 'application/json', data: JSON.stringify({FilterName: "Dirty Deeds"}), // send as json success: function (result) { console.log(result); }, error: function (xhr, status, p3, p4) { var err = "Error " + " " + status + " " + p3; if (xhr.responseText && xhr.responseText[0] == "{") err = JSON.parse(xhr.responseText).message; console.log(err); } }); 

将[FromBody]添加到API方法签名，如public IHttpActionResult Post([FromBody]string filterName)并用引号包装ajax数据参数： data: '"' + bodyContent + '"' 。

不是很直观，但它确实有效。

将[HttpPost]属性添加到控制器中的方法

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