Hydro Crashes when the Namespace does not represent the Path where the View Lies

What happens: Hydro Crashes on Page Load with Argument Exception that view cannot be null.
What did i find: through some debugging of hydro at runtime of an enterprise app i figured that the path, which gets "generated" based on the namespace, was not correct.
What has been done or needs to be done: the namespace of HydroViews do need to represent exactly where the view lies in the folder structure of the project.
What would be expected: either a better error which does some explaining what exactly went wrong since exceptions in asp pages aren't exactly "verbose" or some workaround if a path cannot be found or some decoupling of namespace <-> view path.

i did only tested this with HydroView, don't know from other issues.

fail: Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware[1]
      An unhandled exception has occurred while executing the request.
      System.ArgumentNullException: Value cannot be null. (Parameter 'view')
         at System.ArgumentNullException.Throw(String paramName)
         at System.ArgumentNullException.ThrowIfNull(Object argument, String paramName)
         at Microsoft.AspNetCore.Mvc.Rendering.ViewContext..ctor(ViewContext viewContext, IView view, ViewDataDictionary viewData, TextWriter writer)
         at Hydro.HydroView.GetViewHtml()
         at Hydro.HydroView.GetViewHtml()
         at Hydro.HydroView.ProcessAsync(TagHelperContext context, TagHelperOutput output)
         at Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperRunner.<RunAsync>g__Awaited|0_0(Task task, TagHelperExecutionContext executionContext, Int32 i, Int32 count)
         at ███████████████████.<ExecuteAsync>b__13_0()
         at Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperExecutionContext.GetChildContentAsync(Boolean useCachedResult, HtmlEncoder encoder)
         at Hydro.HydroView.UpdateSlots(TagHelperContext context, TagHelperOutput output)
         at Hydro.HydroView.ProcessAsync(TagHelperContext context, TagHelperOutput output)
         at Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperRunner.<RunAsync>g__Awaited|0_0(Task task, TagHelperExecutionContext executionContext, Int32 i, Int32 count)
         at ███████████████████.ExecuteAsync() in ███████████████████.cshtml:line 10
         at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageCoreAsync(IRazorPage page, ViewContext context)
         at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageAsync(IRazorPage page, ViewContext context, Boolean invokeViewStarts)
         at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderAsync(ViewContext context)
         at Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor.ExecuteAsync(ViewContext viewContext, String contentType, Nullable`1 statusCode)
         at Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor.ExecuteAsync(ViewContext viewContext, String contentType, Nullable`1 statusCode)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResultFilterAsync>g__Awaited|30_0[TFilter,TFilterAsync](ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
         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.<InvokeNextResourceFilter>g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync()
      --- End of stack trace from previous location ---
         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 ███████████████████.Program.<>c.<<SetupWebsocket>b__6_0>d.MoveNext() in ███████████████████\Program.cs:line 296
      --- End of stack trace from previous location ---
         at ███████████████████.Program.<>c.<<ConfigureApp>b__5_0>d.MoveNext() in ███████████████████\Program.cs:line 246
      --- End of stack trace from previous location ---
         at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
         at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
         at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddlewareImpl.Invoke(HttpContext context)

Good catch. Definitely, a better exception message would be helpful, I will fix that. I will also add overridable ViewPath property, same as for HydroComponent.

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Hydro Crashes when the Namespace does not represent the Path where the View Lies #144

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Hydro Crashes when the Namespace does not represent the Path where the View Lies #144

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thumpnail commented on Sep 26, 2025

kjeske commented on Sep 27, 2025

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