C#中方法命名的特殊问题[重复]

Question

我在 ASP.NET Core 中遇到了一个特殊问题。我有一个创建后返回实体的方法。

        [HttpGet("{id}")]
        public async Task<IActionResult> GetItemAsync(int id)
        {
            var entity = await _unitOfWork.UserRepository.FindByIdAsync(id);
            if (entity == null)
                return NotFound();
            return Ok(entity);
        }

        [HttpPost]
        public async Task<IActionResult> CreateUser(UserNewDto userNewDto)
        {
            if (ModelState.IsValid)
            {
                var entity = new User()
                {
                    UserName = userNewDto.UserName,
                    FirstName = userNewDto.FirstName,
                    LastName = userNewDto.LastName,
                    Email = userNewDto.Email,
                    PhoneMobile = userNewDto.PhoneMobile,
                    Password = userNewDto.Password,
                };

                await _unitOfWork.UserRepository.AddAsync(entity);
                await _unitOfWork.Complete();
                return CreatedAtAction("GetItemAsync", new { entity.Id }, entity);
            }

            return new JsonResult("Something went wrong") { StatusCode = 500 };
        }        

CreateUser 方法应该在创建用户后重定向到GetItemAsync。相反，我收到一条错误消息，说明以下内容

System.InvalidOperationException: No route matches the supplied values.
   at Microsoft.AspNetCore.Mvc.CreatedAtActionResult.OnFormatting(ActionContext context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ObjectResultExecutor.ExecuteAsyncCore(ActionContext context, ObjectResult result, Type objectType, Object value)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ObjectResultExecutor.ExecuteAsync(ActionContext context, ObjectResult result)
   at Microsoft.AspNetCore.Mvc.ObjectResult.ExecuteResultAsync(ActionContext context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeResultAsync(IActionResult result)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.ResultNext[TFilter,TFilterAsync](State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeNextResultFilterAsync[TFilter,TFilterAsync]()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResultExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.ResultNext[TFilter,TFilterAsync](State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeResultFilters()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|20_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
   at Swashbuckle.AspNetCore.SwaggerUI.SwaggerUIMiddleware.Invoke(HttpContext httpContext)
   at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, ISwaggerProvider swaggerProvider)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

如果我将方法名称从 GetItemAsync 更改为 GetItem，重定向将按预期工作。我做错了什么？

Answer 1

这是 .net-core 3.0 中的一个问题。请看Async suffix removal from controller action names:

在 ASP.NET Core 3.0 中，ASP.NET Core MVC 删除了 Async 后缀 控制器动作名称。路由和链路生成都受到影响 在这个新的默认设置下。

此更改不会影响使用 [ActionName] 指定的名称 属性。可以使用以下命令禁用默认行为 Startup.ConfigureServices 中的代码：

services.AddMvc(options =>
    options.SuppressAsyncSuffixInActionNames = false);

所以你可以：

1. 用[ActionName]装饰你的动作：

   [ActionName("GetItemAsync")]
   [HttpGet("{id}")]
   public async Task<IActionResult> GetItemAsync(int id)
   

2. 或者在配置服务时设置SuppressAsyncSuffixInActionNames = false：

   public void ConfigureServices(IServiceCollection services)
   {
       services.AddControllers(options =>
           options.SuppressAsyncSuffixInActionNames = false);