How can I handle errors in async methods in ASP.NET Core?

How can I handle errors in async methods in ASP.NET Core?

In ASP.NET Core, you can handle errors in async methods using try-catch blocks or middleware for global error handling.

Can you show me an example of using try-catch in an async method?

Sure! Here's a simple example:

public async Task<IActionResult> GetDataAsync()
{
    try
    {
        var data = await _dataService.GetDataAsync();
        return Ok(data);
    }
    catch (Exception ex)
    {
        return StatusCode(500, "Internal server error: " + ex.Message);
    }
}

What about using middleware for error handling?

You can create a custom middleware to catch exceptions globally. Here's a basic example:

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)
        {
            context.Response.StatusCode = 500;
            await context.Response.WriteAsync("Internal server error: " + ex.Message);
        }
    }
}

How do I register this middleware in the Startup class?

You can register the middleware in the Configure method of your Startup class like this:

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    app.UseMiddleware<ErrorHandlingMiddleware>();
    // other middleware registrations
}