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You can retrieve the launch profile value in .NET Core at runtime by using the IWebHostEnvironment interface, which provides information about the application environment.

Here's an example:

using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Configuration;

public class ExampleClass 
{
    private readonly IConfiguration _configuration;
    private readonly IWebHostEnvironment _environment;

    public ExampleClass(IConfiguration configuration, IWebHostEnvironment environment)
    {
        _configuration = configuration;
        _environment = environment;
    }

    public void GetLaunchProfileValue()
    {
        var launchProfile = _configuration.GetSection("profiles")
                                            .Get<LaunchProfile>()
                                            .FirstOrDefault(p => p.Key == _environment.EnvironmentName);

        // Launch profile value can be accessed through "launchProfile.Value" property
    }
}

public class LaunchProfile
{
    public string Key { get; set; }
    public LaunchValue Value { get; set; }
}

public class LaunchValue
{
    public string ApplicationUrl { get; set; }
    public bool LaunchBrowser { get; set; }
    public string LaunchUrl { get; set; }
}

In the above example, we're injecting IConfiguration and IWebHostEnvironment in the constructor of our ExampleClass. We then use the GetLaunchProfileValue method to retrieve the launch profile value.

The IConfiguration is used to get the launch profiles. We retrieve all the launch profiles using GetSection("profiles"), and then filter the launch profile that matches our current environment name (which is retrieved using _environment.EnvironmentName). We then access the launch profile value through the Value property.

Note: This example assumes that you have defined a launch profile in your launchSettings.json file, and that you've set the environment name in your launchSettings.json file to match the environment name of your application (ASPNETCORE_ENVIRONMENT environment variable).