ASP.NET Core MVC Interview Question #138

What is the purpose of the MVC ErrorViewModel pattern?

Dependency Injection, Services, Error Handling, Logging & Performance Senior Advanced

Quick Interview Answer

An error ViewModel supplies safe information needed by a user-facing error page, commonly a request or correlation identifier. It should not expose the raw exception or sensitive internal details to the browser.

Detailed Explanation

Detailed exception information belongs in protected server-side logs or observability systems, while the public error page should provide a stable and safe user experience.

Code Example

public class ErrorViewModel
{
    public string? RequestId { get; set; }

    public bool ShowRequestId =>
        !string.IsNullOrEmpty(RequestId);
}