Exception handling and redirecting from view component - asp.net-core

Question

How can I implement exception handling in my view component?
Wrapping the logic from my action method into try/catch blocks doesn't catch any exceptions thrown within a view component itself, and I don't want the app to stop functioning regardless of any errors. This is what I'm doing so far and trying to accomplish:
Action Method
public IActionResult LoadComments(int id)
{
try
{
return ViewComponent("CardComments", new { id });
}
catch (SqlException e)
{
return RedirectToAction("Error", "Home");
}
}
To reiterate, this does not catch a SqlException that occurs inside the view component itself, and thus it fails to redirect.
View Component
public class CardCommentsViewComponent : ViewComponent
{
public async Task<IViewComponentResult> InvokeAsync(int id)
{
try
{
IEnumerable<CardCommentData> comments = await DbHelper.GetCardCommentData(id);
return View(comments);
}
catch (SqlException e)
{
//Redirect from here if possible?
}
}
}
Can I accomplish this from the controller's action method? If not, how can I redirect from the view component itself? I've tried researching this problem and came up empty. Any information would be helpful.

Answer 1

You can try to redirect to another page using HttpContextAccessor.HttpContext.Response.Redirect:
public class CardCommentsViewComponent : ViewComponent
{
private readonly IHttpContextAccessor _httpContextAccessor;
public CardCommentsViewComponent( IHttpContextAccessor httpContextAccessor)
{
_httpContextAccessor = httpContextAccessor;
}
public async Task<IViewComponentResult> InvokeAsync(int id)
{
try
{
IEnumerable<CardCommentData> comments = await DbHelper.GetCardCommentData(id);
return View(comments);
}
catch (SqlException e)
{
_httpContextAccessor.HttpContext.Response.Redirect("/About");
return View(new List<CardCommentData>());
}
}
}
Register in DI :
services.TryAddSingleton<IHttpContextAccessor, HttpContextAccessor>();
But the preferred way is using global exception handler /filter to trace the exception and redirect to related error page :
https://learn.microsoft.com/en-us/aspnet/core/fundamentals/error-handling?view=aspnetcore-2.2