c# - 无法解析 Microsoft.AspNetCore.Mvc.Razor.IRazorViewEngine 类型的服务
问题描述
在我的项目中,core 2.2
我有以字符串形式返回的标准服务Razor View
(我需要它在我的客户端中生成 pdf WPF
):
public class RaportService : IRaportService
{
private readonly IProjectRepository projectRepository;
private readonly IRazorViewEngine razorViewEngine;
private readonly ITempDataProvider tempDataProvider;
private readonly IServiceProvider serviceProvider;
public RaportService(
IProjectRepository projectRepository,
IRazorViewEngine razorViewEngine,
ITempDataProvider tempDataProvider,
IServiceProvider serviceProvider)
{
this.projectRepository = projectRepository;
this.razorViewEngine = razorViewEngine;
this.tempDataProvider = tempDataProvider;
this.serviceProvider = serviceProvider;
}
public async Task<string> GenerateProjectRaport(int projectId)
{
var project = await this.projectRepository.GetProjectWithTasksAsync(projectId)
?? throw new EntityNotFoundException();
var httpContext = new DefaultHttpContext { RequestServices = this.serviceProvider };
var actionContext = new ActionContext(httpContext, new RouteData(), new ActionDescriptor());
using (var stringWriter = new StringWriter())
{
string viewPath = "~/wwwroot/RaportTemplate.cshtml";
var viewResult = this.razorViewEngine.GetView(viewPath, viewPath, false);
var viewDictionary = new ViewDataDictionary(new EmptyModelMetadataProvider(), new ModelStateDictionary())
{
Model = new RaportViewModel
{
Project = project,
ProjectTasks = project.Tasks.ToList(),
ProjectEndedTasks = project.EndedTasks.ToList(),
}
};
var viewContext = new ViewContext(
actionContext,
viewResult.View,
viewDictionary,
new TempDataDictionary(actionContext.HttpContext, this.tempDataProvider),
stringWriter,
new HtmlHelperOptions());
await viewResult.View.RenderAsync(viewContext);
return stringWriter.ToString();
}
}
}
在Core 2.2
一切工作正常。当我将项目更新为时,Core 3.0
出现此错误:
{
"stackTrace":" at MediatR.Internal.RequestHandlerBase.GetHandler[THandler](ServiceFactory factory)\r\n
at MediatR.Internal.RequestHandlerWrapperImpl`2.<>c__DisplayClass0_0.<Handle>g__Handler|0()\r\n at MediatR.Pipeline.RequestPostProcessorBehavior`2.Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate`1 next)\r\n
at MediatR.Pipeline.RequestPreProcessorBehavior`2.Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate`1 next)\r\n
at TaskManager.Api.Controllers.RaportController.GetProjectRaport(Int32 projectId) in C:\\Users\\Michał\\Source\\Repos\\michasacuer\\TaskManager\\Src\\Web\\TaskManager.Api\\Controllers\\RaportController.cs:line 12\r\n at lambda_method(Closure , Object )\r\n
at Microsoft.Extensions.Internal.ObjectMethodExecutorAwaitable.Awaiter.GetResult()\r\n
at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.AwaitableObjectResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)\r\n
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Awaited|12_0(ControllerActionInvoker invoker, ValueTask`1 actionResultValueTask)\r\n
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)\r\n
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)\r\n at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)\r\n
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextExceptionFilterAsync>g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)",
"message":"Error constructing handler for request of type MediatR.IRequestHandler`2[TaskManager.Application.Raport.Queries.GetProjectRaport.GetProjectRaportQuery,System.String]. Register your handlers with the container. See the samples in GitHub for examples."}
即使我IRazorViewEngine
在其中注册该接口和类Startup
仍然抛出,他需要一些调用IRazorPageFactoryProvider
但我不知道它的实现是什么。
那么如何让 Razor View Engine 使用.NET Core 3.0
呢?
解决方案
我找到了解决方案。当您想访问(尤其是在 WebApiRazorViewEngine
中.Net Core 3.0
)时,将这两行添加到您的Startup.cs
:
services.AddControllersWithViews();
services.AddRazorPages();
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