[英]ASP.NET Core ViewComponent Invocation: InvalidCastException
這就是我所擁有的
我有一個視圖組件
public class TestViewComponent : ViewComponent
{
public async Task<IViewComponentResult> InvokeAsync(int param1, int param2)
{
return Content(param1.ToString() + param2);
}
}
和控制器一樣
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);
}
}
當我打電話給第一個Index
動作時,一切都很好。 它按預期工作,但當我調用Index1
操作時,我得到一個錯誤,其中包含以下堆棧跟蹤
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()
在反序列化之后似乎存在一些問題。 甚至在調用視圖組件的InvokeAsync
方法之前拋出異常。 我被困在這一段時間了。 任何幫助將非常感激。 謝謝。
錯誤信息幾乎可以告訴我們這里發生了什么。 反序列化字典中的實際object
是Int64
,其中ViewComponent
所期望的參數是Int32
(在C#中也稱為int
)。
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