Throw exceptions on non development enviroment Blazor

Question

I have a Blazor Hosted WebAssembly app written on .NET8, so there are three projects Client, Server and the Shared. Intercommunication happends with Web API calls. In my razor components I have the following code to throw exceptions into a pop-up modal window:

The code in any function:

if (!response.IsSuccessStatusCode)
{
    teamProcessing = false;
    var responseContent = await response.Content.ReadAsStringAsync();
    await ShowTheExceptionModal(responseContent);
}

The exception function

protected async Task ShowTheExceptionModal(string message)
{
    var options = new ModalOptions()
    {
        Size = ModalSize.Custom,
        SizeCustomClass = "bm-modal-custom"
    };
    var parameters = new ModalParameters();
    parameters.Add("message", message);
    var messageForm = modal.Show<Message_Modal>("Exception Error", parameters, options);
    var result = await messageForm.Result;
}

The above works fine when ASPNETCORE_ENVIRONMENT is 'Development' but when ASPNETCORE_ENVIRONMENT is something else, the window opens but there is no message. I think this behaviour occurs due to that exceptions might provide sensitive information. I have also read that there is a middleware when ASPNETCORE_ENVIRONMENT is not 'Development' due to this code on Program.cs of the server.

if (app.Environment.IsDevelopment())
{
    app.UseWebAssemblyDebugging();
}
else
{
    app.UseExceptionHandler("/Error");
    app.UseHsts();
}

In my case I need to throw those exceptions and do not change the code on all functions within the application, is this possible somehow?

Stavros Koureas · Accepted Answer · 2024-09-30 13:51:21Z

Finaly GPT did it again with the proper prompt, in addition I did some handling when the enviroment is not 'Development' to avoid major sensitive information, here is how I solved this but I would like your opinion too!

A new ExceptionHandlingMiddleware class: using System.Net;

namespace mynamespace.Server.Classes
{
    public class ExceptionHandlingMiddleware
    {
        private readonly RequestDelegate _next;
        private readonly ILogger<ExceptionHandlingMiddleware> _logger;

        public ExceptionHandlingMiddleware(RequestDelegate next, ILogger<ExceptionHandlingMiddleware> logger)
        {
            _next = next;
            _logger = logger;
        }

        public async Task InvokeAsync(HttpContext context)
        {
            try
            {
                await _next(context);
            }
            catch (Exception ex)
            {
                //EXCEPTION LOG
                _logger.LogError(ex, "An unhandled exception occurred.");
                //EXCEPTION PUSH INTO WEB CLIENT
                context.Response.ContentType = "application/json";
                context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
                if (Parameters.enviroment == "Development")
                {
                    //This contains sensitive information
                    //ex.ToString() deserializes the whole object
                    string exception = ex.ToString();
                    await context.Response.WriteAsync(exception);
                }
                else
                {
                    //This does not contain sensitive information
                    string exception = ex.Message + Environment.NewLine + ex.StackTrace;
                    await context.Response.WriteAsync(exception);
                }

                //context.Response.Redirect("/Error"); //Redirect the exception
                //throw; //Rethrow the exception //Carefull here it might cause unpredicted behaviour as multiple iterations can happen.
            }
        }
    }
}

A new usage into startup.cs

app.UseMiddleware<ExceptionHandlingMiddleware>();

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