Method not found: then send request web api controller答案

【问题标题】：Method not found: when send request web api controlerMethod not found: then send request web api controller
【发布时间】：2018-12-30 01:11:32
【问题描述】：

当我尝试调用 api 方法时，我遇到了异常

找不到方法：'无效 System.Web.Http.Filters.HttpActionExecutedContext.set_Response(System.Net.Http.HttpResponseMessage)'。

ApiController:-

[System.Web.Http.HttpGet]
public HttpResponseMessage CheckUserAuthentication(string UserName, string Password)
{
    DomUserAuthentication objauthentication = new DomUserAuthentication();
    var res = Request.CreateResponse(HttpStatusCode.OK);
    /////Code here
    res.Content = new StringContent(json, Encoding.UTF8, "application/json");
    return res;
}

这是我的 Webapi.config：-

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

错误详情：-

<Error>
<Message>An error has occurred.</Message>
<ExceptionMessage>
Method not found: 'Void System.Web.Http.Filters.HttpActionExecutedContext.set_Response(System.Net.Http.HttpResponseMessage)'.
</ExceptionMessage>
<ExceptionType>System.MissingMethodException</ExceptionType>
<StackTrace>
at SalesRevUp.CrossCutting.DataAPIErrors.OnException(HttpActionExecutedContext context) at System.Web.Http.Filters.ExceptionFilterAttribute.System.Web.Http.Filters.IExceptionFilter.ExecuteExceptionFilterAsync(HttpActionExecutedContext actionExecutedContext, CancellationToken cancellationToken) at System.Web.Http.ApiController.<>c__DisplayClass8.<>c__DisplayClassa.<InvokeActionWithExceptionFilters>b__6(IExceptionFilter filter) at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext() at System.Threading.Tasks.TaskHelpers.IterateImpl(IEnumerator`1 enumerator, CancellationToken cancellationToken)
</StackTrace>
</Error>

【问题讨论】：

标签： c# asp.net-mvc asp.net-mvc-4 asp.net-web-api csharpcodeprovider

【解决方案1】：

作为替代解决方案，您可以使用属性路由 https://docs.microsoft.com/en-us/aspnet/web-api/overview/web-api-routing-and-actions/create-a-rest-api-with-attribute-routing

    [Route("IntermediaryData/CheckUserAuthentication")]
    [System.Web.Http.HttpGet]
    public HttpResponseMessage CheckUserAuthentication(string UserName, string Password)
    {
        DomUserAuthentication objauthentication = new DomUserAuthentication();
        var res = Request.CreateResponse(HttpStatusCode.OK);
        /////Code here
        res.Content = new StringContent(json, Encoding.UTF8, "application/json");
        return res;
    }

【讨论】：

【解决方案2】：

Get 方法的名称不正确将名称从“CheckUserAuthentication”更改为“GetCheckUserAuthentication”

 public HttpResponseMessage GetCheckUserAuthentication(string UserName, string Password)
        {
            DomUserAuthentication objauthentication = new DomUserAuthentication();
            var res = Request.CreateResponse(HttpStatusCode.OK);
            ///////Code here
            res.Content = new StringContent(json, Encoding.UTF8, "application/json");
            return Request.CreateResponse(HttpStatusCode.OK);
        }

【讨论】：

感谢您的建议。但不适合我！如果有任何不同的方法，请提出建议。
能否添加整个 API 控制器代码 sn-p 且不包含核心业务逻辑
我尝试了以下测试方法，但它也不起作用。这是代码详细信息：- [System.Web.Http.HttpGet] public HttpResponseMessage GetTest() { var res = Request.CreateResponse(HttpStatusCode.OK);字符串 json = JsonConvert.SerializeObject("ABC"); res.Content = new StringContent(json, Encoding.UTF8, "application/json");返回资源； }
你是怎么从浏览器调用这个的？

【解决方案3】：

如果此问题仍然存在。我找到了解决方案。问题出在 .Net 框架上。我已经从 4.6 更新到 4.7，问题解决了。

【讨论】：