Custom Data Annotations for validation

Question

I want to create a Data Annotation to be able to check in ALL pages of my application if the user who is logging in already has 1 Condomínio registered, if there is no registered condominium it redirects to the condominium registration screen.

What I have at the moment is this:

protected async Task<ValidationResult> IsValidAsync(ValidationContext validationContext)
{
    var userId = await _userManager.GetUserAsync(user);

    List<ApplicationCondominium> result = await _condominiumManager.GetCondominiumAsync(userId.Id);

    if (result.Count() == 0)
    {
        return ValidationResult.
    }
    else
    {
        return ValidationResult.Success;
    }
 }

They could help me because I need this validation on all pages of my application.

Answer 1

Basically you need to create a Middleware, that when checking your code whether or not a condominium exists makes the redirect. Example:

Create a class:

public class RedirectNoApartment
{
    private readonly RequestDelegate _next;
    private readonly bool status = true;
    private readonly string path = "/home/about";

    public RedirectNoApartment(RequestDelegate next)
    {
        _next = next;
    }
    public async Task Invoke(HttpContext httpContext)
    {
        status = ; // aqui você adiciona o código de verificação retornando true ou false
        if (!status && httpContext.Request.Path != path)
        {
            httpContext.Response.Redirect(path);                
        } 
        else
            await _next(httpContext);
    }
}

Within this class there is a bool status which is a variable for you to search in your bank and bring whether or not there is a condominium for a particular user and also a string path that your default redirect to load the condominium registration page.

Now get in the file startup.cs below the configuration connection to the database add this line

app.UseMiddleware<RedirectNoApartment>();

ready every time it will check whether or not the user has registered condominium

• ASP.NET - Use Custom Middleware to Detect and Fix 404s in ASP.NET Core Apps
• ASP.NET Core Middleware

This code can be better prepared and suited to your needs, this is an example be to see your reality.