I have a .NET Core project where based on the subdomain I will load different Layout.cshtml pages.
Based on the subdomain a query should be done in the database which will return a code. Based on this code in my ViewStart.cshtml I will load the different layouts.
How can I get the subdomain? And where?
You can simply add your own logic into your views or the global _ViewStart.cshtml that selects the correct layout depending on your own criterias. What I did in the past is add a ViewData property, so my _ViewStart.cshtml looks like this:
@{
Layout = (string)ViewData["_OverwriteLayout"] ?? "_DefaultLayout";
}
So I just need to set the ViewData["_OverwriteLayout"] value somewhere inside the MVC pipeline. I personally did that within a ResultFilter, so that the logic does not run when non-view results are returned.
That could for example look like this:
public class CustomLayoutResultFilter : IAsyncResultFilter
{
public Task OnResultExecutionAsync(ResultExecutingContext context, ResultExecutionDelegate next)
{
if (context.Result is ViewResult viewResult)
{
if (context.HttpContext.Request.Host.ToString() == "test.example.com")
viewResult.ViewData["_OverwriteLayout"] = "_TestLayout";
}
return next();
}
}
You can create multiple Layout and can call them from their ViewStart.cshtml file. Example if you have an second _Layout2.cshtml in a different folder from the other Layout then you create in this folder an _ViewStart.cshtml file with this path
@{
Layout="~/Views/Shared/[your folder]_Layout2.cshtml"
}