Initialization

Once you have created your document class, you have to initialize the library in order to operate against the Solr instance. This is usually done once at application startup:

Startup.Init<Product>("http://localhost:8983/solr");

Then you ask the service locator for the SolrNet service instance which allows you to issue any supported operation:

var solr = ServiceLocator.Current.GetInstance<ISolrOperations<Product>>();
await solr.DeleteAsync(SolrQuery.All);
await solr.AddAsync(p);
await solr.CommitAsync();
var products = await solr.QueryAsync(new SolrQueryByRange<decimal>("price", 10m, 100m));

Microsoft.Extensions.DependencyInjection (ASP.NET core)

Install-Package SolrNet.Microsoft.DependencyInjection

To use, with an IServiceCollection instance and one or more assemblies:

services.AddSolrNet("http://localhost:8983/solr");
services.AddSolrNet<Person>("http://localhost:8983/solr/person");

Castle Windsor

Install-Package SolrNet.Windsor

Alternatively, if your app uses Castle Windsor you can set up SolrNet using the included facility:

container.AddFacility("solr", new SolrNetFacility("http://localhost:8983/solr"));

Or using Windsor's xml config:

<castle> 
    <facilities> 
        <facility id="solr" type="Castle.Facilities.SolrNetIntegration.SolrNetFacility, SolrNet">
            <solrURL>http://localhost:8983/solr</solrURL> 
        </facility> 
    </facilities> 
</castle>

Ninject

If you're using Ninject, you can use the Ninject module:

Install-Package SolrNet.Ninject

kernel.Load(new SolrNetModule("http://localhost:8983/solr"));

StructureMap

Install-Package SolrNet.StructureMap

If you are using StructureMap, you can use the StructureMap module (StructureMap.SolrNetIntegration):

IEnumerable<SolrServer> solrServers = new[]
{
	new SolrServer(id: "test", url: "http://localhost:8893", documentType: "testDocumentType")
};

var container = new StructureMap.Container(SolrNetRegistry.Create(solrServers));

Autofac

Install-Package SolrNet.Autofac

var builder = new ContainerBuilder();
builder.RegisterModule(new SolrNetModule("http://localhost:8983/solr"));
var container = builder.Build();

Unity

Install-Package SolrNet.Autofac

var solrServers = new SolrServers {
        new SolrServerElement {
          Id = "test",
          Url = "http://localhost:8893",
          DocumentType = typeof (Entity).AssemblyQualifiedName,
        }
};
container = new UnityContainer();
new SolrNetContainerConfiguration().ConfigureContainer(solrServers, container);

SimpleInjector

Install-Package SolrNet.SimpleInjector

Create or use an existing SimpleInjector Container and add Solr by passing its URL: 
var container = new SimpleInjector.Container();
container.AddSolrNet("http://localhost:8983/solr");

Multi-core mapping

If you need to map multiple Solr cores/instances, see this page.