Instantiate an ElevationService in 0.2.0

[sk-zk]

How do I instantiate an ElevationService in 0.2.0? Previously, I did this:

class Elevation
{
    DEMDataSet dataSet;
    ElevationService elevationService;

    public Elevation()
    {
        dataSet = DEMDataSet.AW3D30;
        var gdal = new GDALVRTFileService();
        var raster = new RasterService(gdal);
        elevationService = new ElevationService(raster);
    }

...

Which doesn't work anymore, and the samples I've looked at just assume I already have an IElevationService I can pass into them.

[xfischer]

Hi @sk-zk and thanks for reporting this.
DEM Net is written in a Dependency Injection friendly context. Sorry for not updating the samples.

Here is the quick fix :

class Elevation
{
    DEMDataSet dataSet;
    ElevationService elevationService;

    public Elevation()
    {
        dataSet = DEMDataSet.AW3D30;
        var gdal = new GDALVRTFileService();
        var raster = new RasterService( _ => gdal); // <------- FIX HERE
        elevationService = new ElevationService(raster);
    }

The Raster service needs to know what's the file source indexing system (GDAL VRT in your case, but there's also Nasa Earth Data, and FileSystem).

[xfischer]

To setup DI in your project, change your program to the following (I suppose you run on a ConsoleApp)

using DEM.Net.Core;
using DEM.Net.Core.Datasets;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;

class Program
{
    static void Main(string[] args)
    {
        // Needs the following NuGet packages
        // - Microsoft.Extensions.DependencyInjection
        // - Microsoft.Extensions.Logging.Console
        var services = new ServiceCollection()
                    .AddLogging(config =>
                    {
                        config.AddConsole(); // Log to console (colored !)
                    })
                    .AddDemNetCore()
                    .AddSingleton<ElevationApp>(); // <-- Your app gets registered here
        // Everything added to the constructor of your App from DEM.Net will be injected at runtime.
        // You can for example add an ILogger<ElevationApp> for your logging

        var provider = services.BuildServiceProvider();
        var app = provider.GetService<ElevationApp>();

        app.Run();

    }
}

class ElevationApp
{
    DEMDataSet dataSet;
    IElevationService elevationService;
     ILogger<ElevationApp> logger;

    public ElevationApp(IElevationService elevationService // <-- injected automatically
                        , ILogger<ElevationApp> logger;) // <-- injected automatically
    {
        this.elevationService = elevationService;
        this.logger = logger;
        dataSet = DEMDataSet.AW3D30;
    }

    public void Run()
    {
        logger.LogInformation("Starting ElevationApp...");
        // Your code here
    }
}

[sk-zk]

Thanks for the quick response!