Dependency injection (connectors)

Skip this page unless you are building a desktop connector, ASP.NET service, or app that shares a DI container with Speckle.Sdk. For scripts, notebooks, and Grasshopper C#, use the bootstrap in Automate with scripts and read Build your first model analysis tool instead.

When you build a connector, ASP.NET service, or any app that shares a DI container with Speckle.Sdk, you register the SDK on your IServiceCollection and resolve services from that container. What this page covers: what AddSpeckleSdk registers and why. When to read it: connector or service authors only — scripts paste bootstrap from Automate with scripts. Read next: Service Registration for the full signature.

When to Read This Page

You are…	Start here instead
Writing a script, notebook cell, or Grasshopper C# component	Automate with scripts — copy the bootstrap, skip this page
Following the Quickstart for the first time	Finish the quickstart first; come back here only if you need to customize registration
Building a connector, ASP.NET service, or app that shares a DI container with Speckle.Sdk	This page

Why Dependency Injection?

Unlike specklepy’s import-and-go model, Speckle.Sdk resolves almost everything you’ll use — the client factory, account manager, operations, transports — from an Microsoft.Extensions.DependencyInjection container. This lets host applications (Revit, Rhino, ASP.NET services) share a single DI container with the SDK, and lets the SDK swap implementations (logging, activity tracing, metrics) without changing your code.

Scripts and notebooks: you still call AddSpeckleSdk once, but you do not need this page. See Automate with scripts.

What `AddSpeckleSdk` Registers

https://mintcdn.com/speckle/VtRPWzmN-ULoLfIv/images/developers/sdks/csharp.svg?fit=max&auto=format&n=VtRPWzmN-ULoLfIv&q=85&s=f2970e3b8bd4a2c7899b46211a42f251

Example

using Microsoft.Extensions.DependencyInjection;
using Speckle.Sdk;

var services = new ServiceCollection();
services.AddSpeckleSdk(new Application("My App", "my-app"), "1.0.0");
var provider = services.BuildServiceProvider();

AddSpeckleSdk is an extension method on IServiceCollection that:

Initializes TypeLoader with the assemblies you provide (plus the SDK’s own assembly), so custom Base-derived types can be resolved by speckle_type during deserialization.
Registers an ISpeckleApplication singleton describing your host application (name, version, Speckle version).
Registers default ISdkActivityFactory and ISdkMetricsFactory implementations (no-ops unless you supply your own).
Scans the SDK assembly and registers every class that implements an interface as transient — this is how IOperations, IClientFactory, IAccountManager, IServerTransportFactory, and others become resolvable.

The first argument to AddSpeckleSdk is an Application record — your host app’s display name and slug:

Example

public record Application(string Name, string Slug);

Registering Your Own Types

If you use Speckle.Objects or define custom Base-derived types, pass their assemblies so TypeLoader can resolve them:

Example

services.AddSpeckleSdk(
    new Application("My App", "my-app"),
    "1.0.0",
    assemblies: [typeof(Speckle.Objects.Geometry.Point).Assembly, typeof(MyCustomType).Assembly]
);

If you send or receive a custom type whose assembly wasn’t passed to AddSpeckleSdk, deserialization falls back to a plain Base instead of your concrete type. This is a common source of “why did I get a Base instead of my type?” confusion.

Resolving Services

Resolve what you need from the built IServiceProvider:

Example

var operations = provider.GetRequiredService<IOperations>();
var accountFactory = provider.GetRequiredService<IAccountFactory>();
var clientFactory = provider.GetRequiredService<IClientFactory>();
var transportFactory = provider.GetRequiredService<IServerTransportFactory>();

Service	Resolves	Used for
`IOperations`	`Operations`	Send, Receive, Serialize
`IClientFactory`	`ClientFactory`	Building `IClient` from an `Account`
`IAccountFactory`	`AccountFactory`	Building an `Account` from a token
`IAccountManager`	`AccountManager`	Interactive login, stored accounts
`IServerTransportFactory`	`ServerTransportFactory`	Constructing `ServerTransport`

Transports like ServerTransport have constructor dependencies (ISpeckleHttp, ISdkActivityFactory) that come from the container. Always construct them via their *Factory interface rather than new ServerTransport(...) directly.

If you’re building a connector or a service that already has its own IServiceCollection (for example, an ASP.NET Core app), call AddSpeckleSdk on that same collection rather than creating a separate container:

Example

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddSpeckleSdk(new Application("My Service", "my-service"), "1.0.0");
var app = builder.Build();

This lets Speckle.Sdk share your application’s logging configuration (AddLogging is called internally, but respects any logging providers you’ve already registered) and lifetime management.

FAQ

I'm writing a script — do I need this page?

No. Copy the bootstrap from Automate with scripts and resolve IOperations and IClientFactory from the static helper. You do not register your own services unless you integrate with a host container.

Why did Receive return Base instead of my custom type?

Pass your custom type’s assembly to AddSpeckleSdk so TypeLoader can resolve speckle_type during deserialization. Without it, unknown types fall back to plain Base.

Can I construct ServerTransport with new ServerTransport(...)?

No. Use IServerTransportFactory.Create(account, projectId) — the transport constructor depends on services registered by AddSpeckleSdk.

Next Steps

Core concepts

Platform map before connector wiring

Publish large models (connectors)

SendPipeline in production connectors

Service Registration

AddSpeckleSdk signature and options

​When to Read This Page

​Why Dependency Injection?

​What AddSpeckleSdk Registers

​Registering Your Own Types

​Resolving Services

​Sharing a Container with a Host Application

​FAQ

​Next Steps

Core concepts

Publish large models (connectors)

Service Registration

When to Read This Page

Why Dependency Injection?

What `AddSpeckleSdk` Registers

Registering Your Own Types

Resolving Services

Sharing a Container with a Host Application

FAQ

Next Steps