WebApi中的内联约束错误

本文关键字：约束 错误 WebApi | 更新日期: 2023-09-27 18:20:31

我的webapi中有自定义路由。当我调用它时，我得到以下错误

The inline constraint resolver of type 'DefaultInlineConstraintResolver' was unable to resolve the following inline constraint: 'MovieData'.

堆栈跟踪：at System.Web.Http.Routing.InlineRouteTemplateParser.GetInlineConstraint(Group constraintGroup, Boolean isOptional, IInlineConstraintResolver constraintResolver) at System.Web.Http.Routing.InlineRouteTemplateParser.ParseRouteTemplate(String routeTemplate, IDictionary 2默认值，IDictionary 2 constraints, IInlineConstraintResolver constraintResolver) at System.Web.Http.Routing.DirectRouteFactoryContext.CreateBuilder(String template, IInlineConstraintResolver constraintResolver) at System.Web.Http.Routing.DirectRouteFactoryContext.CreateBuilderInternal(String template) at System.Web.Http.Routing.DirectRouteFactoryContext.CreateBuilder(String template) at System.Web.Http.RouteAttribute.System.Web.Http.Routing.IDirectRouteFactory.CreateRoute(DirectRouteFactoryContext context) at System.Web.Http.Routing.DefaultDirectRouteProvider.CreateRouteEntry(String prefix, IDirectRouteFactory factory, IReadOnlyCollection 1操作，IInlineConstraintResolver constraintResolver, Boolean targetIsAction) at System.Web.Http.Routing.DefaultDirectRouteProvider.CreateRouteEntries(String prefix, IReadOnlyCollection 1工厂，IReadOnlyCollection 1 actions, IInlineConstraintResolver constraintResolver, Boolean targetIsAction)位于System.Web.Http.Routing.DefaultDirectRouteProvider.GetActionDirectRoutes（HttpActionDescriptor actionDescriptor，IReadOnlyList 1 factories, IInlineConstraintResolver constraintResolver)位于System.Web.Http.Routing.DefaultDirectRouteProvider.GetDirectRoutes（HttpControllerDescriptor controllerDescriptor，IReadOnlyList 1 actionDescriptors, IInlineConstraintResolver constraintResolver)位于System.Web.Http.Routing.AttributeRoutingMapper.AddRouteEntries（SubRouteCollection收集器、HttpConfiguration配置、IInlineConstraintResolver、IDirectRouteProvider directRouteProvider）位于System.Web.Http.Routing.AttributeRoutingMapper。<>c_DisplayClass2.<>c__DisplayClass4.b_1（） at System.Web.Http.Routing.RouteCollectionRoute.EnsureInitialized(Func 1初始值设定项）位于System.Web.Http.Routing.AttributeRoutingMapper。<>c_DisplayClass2.b_0（HttpConfiguration配置）位于System.Web.Http.HttpConfiguration.EnsureInitialized（）位于System.Web.Http.GlobalConfiguration.Configure（操作1 configurationCallback)位于c:''Users''VinoBarathi''Documents''Visual Studio 2013''Projects''MoviesAPI''MoviesAPI''Global.asax.cs:line 14`中的MoviesAPI.WebApiApplication.Application_Start（）

ApiController:
[HttpGet][Route("~/api/Values/GetMovieByCategory/{movieData:MovieData}")]
public IEnumerable<MovieData> GetMovieByCategory(MovieData movieData)
{
IEnumerable<MovieData> movieDataByCat = null; string[] paramCast; if (movieData.Cast.Count() != 0)
paramCast = movieData.Cast;
IEnumerable<MovieData> GetAllMovies = null;
GetAllMovies = repo.GetAll();

        if (movieData.Cast == null || movieData.Cast.Count() == 0)
        {
            movieDataByCat = from data in GetAllMovies
                             where (data.Classification == (movieData.Classification == null ? string.Empty : movieData.Classification) ||
                                    data.Genre == (movieData.Genre == null ? string.Empty : movieData.Genre) ||
                                    data.Rating == movieData.Rating ||
                                    data.ReleaseDate == movieData.ReleaseDate ||
                                    data.Title == (movieData.Title == null ? string.Empty : movieData.Title))
                             select data;
        }
        return movieDataByCat;
    }`

帮我克服这个。

WebApi中的内联约束错误

您需要实现名为MovieData的内联约束，该约束继承自IHttpRouteConstraint。它在您的路由中声明：[route（"~/api/Values/GetMovieByCategory/｛movieData:movieData｝"）]

10在WebApiConfig文件中注册：

  var constraintResolver = new DefaultInlineConstraintResolver();
            constraintResolver.ConstraintMap.Add("MovieData", typeof(MovieDataRouteConstraint));
           config.MapHttpAttributeRoutes(constraintResolver);
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