Question

我有以下控制器：

public class ValuesController : ApiController
{
    // POST api/values
    public IHttpActionResult Post(string filterName)
    {
        return new JsonResult<string>(filterName, new JsonSerializerSettings(), Encoding.UTF8, this);

    }
}

WebApi配置

config.Routes.MapHttpRoute(
    name: "DefaultApi",
    routeTemplate: "api/{controller}/{id}",
    defaults: new { id = RouteParameter.Optional });

我使用这个js代码来调用api

$.ajax(
{
    url: "/api/values/",
    type: "POST",
    dataType: 'json',
    data: { filterName: "Dirty Deeds" },
    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);
    }
});

我得到405方法不允许（发布）

Answer 1

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<string>(filterName, new JsonSerializerSettings(), Encoding.UTF8, this);
    }

的JavaScript

$.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);
    }
});

解释

因为您只发送一个值，所以在它前面加上=符号，这样它就会被视为表格编码。如果您想清楚这是您正在对ajax调用进行的操作，也可以添加内容类型。

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<string>(filter.FilterName, new JsonSerializerSettings(), Encoding.UTF8, this);
    }

的JavaScript

$.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);
    }
});

Answer 2

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

不是很直观，但确实有效。

Answer 3

将[HttpPost]属性添加到控制器

中的方法

WebApi 2 POST，单个字符串参数不起作用

3 个答案:

解释