【WEBAPI】关于WEBAPI无法获取数据的问题之一（Issues while making a POST to a Web API from JQuery）

I have a web api with the following POST Method

public HttpResponseMessage Post([FromBody]string package)

　　

I have a console app that uses the HttpCLient with no problems. When I try to make a call by means of jQuery, I get null on the package variable.

This is the code I have right now:

$.ajax({
url: 'http://localhost:8081/api/Package/',
type: 'POST',
data: JSON.stringify(message), 
contentType: "application/json;charset=utf-8",
success: function (data) {
alert(data.length);

},
error: function (xhr, ajaxOptions, thrownError) {
alert('Status: '+xhr.status+', Error Thrown: '+thrownError);

}
});

　　

直接采用上面的代码，无法获取数据，在参数前加个 "="，就可以映射到服务参数中去。如下代码

$.ajax({
url: 'http://localhost:8081/api/Package/',
type: 'POST',
data: "=" + JSON.stringify(message), 
contentType: "application/json;charset=utf-8",
success: function (data) {
alert(data.length);

},
error: function (xhr, ajaxOptions, thrownError) {
alert('Status: '+xhr.status+', Error Thrown: '+thrownError);

}
});