ASP0008: Do not use ConfigureWebHost with WebApplicationBuilder.Host

	Value
Rule ID	ASP0008
Category	Usage
Fix is breaking or non-breaking	Non-breaking

Cause

ConfigureWebHost can't be used with the Host property on WebApplicationBuilder.

Rule description

The WebApplicationBuilder doesn't support configuring the WebHost before build using the ConfigureWebHost extension method.

var builder = WebApplication.CreateBuilder(args);

builder.Host.ConfigureWebHost(webHostBuilder => {
    webHostBuilder.UseContentRoot(Path.Combine(Directory.GetCurrentDirectory(), "myContentRoot"));
});

var app = builder.Build();

app.Run();

How to fix violations

To fix a violation of this rule, configure the WebHost directly on the WebApplicationBuilder. For example, instead of setting the content root path via ConfigureWebHost.

var builder = WebApplication.CreateBuilder(args);

builder.Host.ConfigureWebHost(webHostBuilder =>
{
    webHostBuilder.UseContentRoot(Path.Combine(Directory.GetCurrentDirectory(), "myContentRoot"));
});

var app = builder.Build();

app.Run();

Configure the content root path directly on the WebApplicationBuilder.WebHost.

var builder = WebApplication.CreateBuilder(args);

builder.WebHost.UseContentRoot(Path.Combine(Directory.GetCurrentDirectory(), "foobar"));

var app = builder.Build();

app.Run();

When to suppress warnings

Do not suppress a warning from this rule. A misconfigured application can result in unexpected behavior at runtime.