How can I handle errors in ASP.NET Core routing?

How can I handle errors in ASP.NET Core routing?

In ASP.NET Core, you can handle errors in routing by using middleware. You can create a custom error handling middleware to catch exceptions.

Can you show me an example of custom error handling middleware?

Sure! You can create a middleware class like this:

public class ErrorHandlingMiddleware {
    private readonly RequestDelegate _next;

    public ErrorHandlingMiddleware(RequestDelegate next) {
        _next = next;
    }

    public async Task InvokeAsync(HttpContext context) {
        try {
            await _next(context);
        } catch (Exception ex) {
            // Log the exception and return a custom error response
            context.Response.StatusCode = 500;
            await context.Response.WriteAsync("An error occurred: " + ex.Message);
        }
    }
}

Then, register it in the Configure method of Startup.cs.

What about handling 404 errors specifically?

For 404 errors, you can use the UseStatusCodePages middleware. It allows you to return a custom response for 404 errors. Here's how to set it up:

app.UseStatusCodePages(async context => {
    context.HttpContext.Response.ContentType = "text/plain";
    await context.HttpContext.Response.WriteAsync("Page not found!");
});