ASP.NET Ядро ViewComponent Призвание: InvalidCastException

Question

Вот что у меня есть

У меня есть компонент представления как

public class TestViewComponent : ViewComponent 
{ 
    public async Task<IViewComponentResult> InvokeAsync(int param1, int param2) 
    { 
     return Content(param1.ToString() + param2); 
    } 
} 

и контроллер как

public class HomeController : Controller 
{ 
    private Dictionary<string, object> _dict = new Dictionary<string, object>(); 

    public IActionResult Index() 
    { 
     _dict = new Dictionary<string, object>() { ["param1"] = 100, ["param2"] = 200 }; 
     return ViewComponent("Test", _dict) 
    } 

    public IActionResult Index1() 
    { 
     var obj = new { param1 = 100, param2 = 200 }; 
     var objString = JsonConvert.SerializeObject(obj); 
     _dict = JsonConvert.DeserializeObject<Dictionary<string, object>>(objString); 
     return ViewComponent("Test", _dict); 
    } 
} 

Когда я называю первый Index действие все хорошо. Это работает, как ожидалось, но когда я называю Index1 действие я получаю сообщение об ошибке со следующей трассировки стека

System.InvalidCastException: Unable to cast object of type 'System.Int64' to type 'System.Int32'. 
    at lambda_method(Closure , Object , Object[]) 
    at Microsoft.AspNetCore.Mvc.ViewComponents.DefaultViewComponentInvoker.<InvokeAsyncCore>d__6.MoveNext() 
--- End of stack trace from previous location where exception was thrown --- 
    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
    at Microsoft.AspNetCore.Mvc.ViewComponents.DefaultViewComponentInvoker.<InvokeAsync>d__5.MoveNext() 
--- End of stack trace from previous location where exception was thrown --- 
    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
    at Microsoft.AspNetCore.Mvc.ViewComponents.DefaultViewComponentHelper.<InvokeCoreAsync>d__12.MoveNext() 
--- End of stack trace from previous location where exception was thrown --- 
    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
    at Microsoft.AspNetCore.Mvc.ViewFeatures.Internal.ViewComponentResultExecutor.<ExecuteAsync>d__6.MoveNext() 
--- End of stack trace from previous location where exception was thrown --- 
    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
    at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeResultAsync>d__30.MoveNext() 
--- End of stack trace from previous location where exception was thrown --- 
    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
    at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeNextResultFilterAsync>d__28.MoveNext() 
--- End of stack trace from previous location where exception was thrown --- 
    at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ResultExecutedContext context) 
    at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted) 
    at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeNextResourceFilter>d__22.MoveNext() 
--- End of stack trace from previous location where exception was thrown --- 
    at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ResourceExecutedContext context) 
    at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted) 
    at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeAsync>d__20.MoveNext() 
--- End of stack trace from previous location where exception was thrown --- 
    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
    at Microsoft.AspNetCore.Builder.RouterMiddleware.<Invoke>d__4.MoveNext() 
--- End of stack trace from previous location where exception was thrown --- 
    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
    at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.<Invoke>d__6.MoveNext() 

Кажется, есть некоторая проблема после десериализации. Исключение генерируется еще до того, как вызывается метод компонента вида InvokeAsync. Я застрял на этом некоторое время. Любая помощь будет действительно оценена. Спасибо.

Answer 1

Сообщение об ошибке в значительной степени говорит о том, что происходит здесь. Фактически object s в десериализованном словаре: Int64 s, аргументы которого ожидаются ViewComponent: Int32 (также называемый int в C#).