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Temporal changes a background job from work that depends on one worker’s in-memory progress into a Workflow whose orchestration can resume from recorded history. In .NET, the essential design shift is to keep replayable decisions in Workflow code and move network calls, database access, and other external effects into Activities. Use Temporal’s timers rather than ordinary .NET time APIs, and plan for open Workflows when changing code. .NET 10 is an LTS release, but that alone does not establish compatibility with a particular Temporal .NET SDK version.
What changes when a background job must survive a process?
A conventional hosted service or queue consumer usually tracks progress in its own process and whatever state the application explicitly saves elsewhere. If the process stops, the job may need to be retried, reconstructed, or resumed using application-specific persistence and coordination.
A Temporal Workflow expresses orchestration as code while Temporal records its progress in Event History. When a Worker restarts or a Workflow task is replayed, the SDK uses that history to re-create the Workflow’s state and continue its decisions. This changes where durable progress comes from: the Workflow’s orchestration is replayed against recorded events rather than relying only on the original process remaining alive.
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That does not make every external action happen exactly once or remove the need to design for failures. It gives the application a durable orchestration model; the boundary between orchestration and external work remains important.
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Four parts of the .NET model
- Workflow: owns orchestration and state transitions, such as choosing the next step, waiting, or scheduling work.
- Activity: performs external or otherwise nondeterministic work, such as calling an API or accessing a database.
- Worker: runs Workflow and Activity tasks.
- Client: starts Workflows and communicates with them.
The official Temporal .NET guide organizes the development path around these concepts, along with testing, debugging, and best practices. Start with its current quickstart and SDK documentation when choosing a package version and implementing the code.
What belongs in a Workflow and what belongs in an Activity?
The distinction is not simply “business logic versus infrastructure.” A Workflow can contain business decisions, provided those decisions are replay-safe. An Activity is the boundary for work whose result depends on the outside world or that produces an external effect.
| Concern | Workflow | Activity |
|---|---|---|
| Primary role | Replayable orchestration and state transitions | External or nondeterministic work |
| Examples | Choose the next step, wait for a signal, schedule an Activity, or use a durable timer | Call an HTTP API, query or update a database, read external state, or perform I/O |
| Replay requirement | Must issue the same Temporal API calls in the same sequence for the same input | Its external operation is not part of the Workflow replay path |
Temporal’s documentation puts the core constraint plainly: “Workflow code must be deterministic to support replay.” Replay correctness is about matching the orchestration decisions and Temporal API calls with the recorded history, not merely returning the same final value.
A practical design test
- If the code must contact a service, inspect mutable external state, read or write a file, or perform another I/O operation, put that work in an Activity.
- If the code decides which Activity to schedule, whether to wait, or how to react to Workflow input or messages, it may belong in Workflow logic, subject to replay determinism.
- If a decision depends on a changing external value, have an Activity obtain that value and let the Workflow use the recorded Activity result.
This split makes the orchestration reproducible while keeping external interactions in a place where their own failure and retry behavior can be handled.
How do you keep .NET Workflow code replay-safe?
Temporal replays Workflow code against its Event History. For a given input, the Workflow must make the same Temporal API calls in the same order as it did before. A normal .NET operation that varies between runs can change that sequence and make the Workflow incompatible with its history.
Avoid ordinary clocks, timers, and nondeterministic work
The Temporal .NET SDK README specifically warns against using DateTime.Now, Task.Delay, and Thread.Sleep in Workflow code. Use Temporal’s Workflow time and timer APIs instead; the README identifies Workflow.DelayAsync as the timer primitive. Ordinary clocks and timers are suitable for ordinary application code, but they are not substitutes for durable Workflow time.
Keep network, disk, and standard input/output operations out of Workflow logic. Avoid decisions based on mutable external state, ordinary random calls, and thread behavior that can vary on replay. The SDK’s deterministic task scheduler also makes common .NET patterns such as Task.Run and ConfigureAwait(false) hazards in Workflow code. These are Workflow-specific constraints, not a general prohibition on using those APIs inside Activities or elsewhere in the application.
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A Workflow can schedule an Activity, wait for its result, then decide what should happen next. It can also wait for a timer or a message rather than holding a worker thread in a sleep. The .NET guide covers message passing, timers, cancellation, child Workflows, schedules, and continue-as-new. Use the current SDK documentation for exact signatures and behavior for the package version you deploy.
How should Activities handle retries and side effects?
Activities are the right place for external operations, but putting an operation in an Activity does not make a remote system guarantee exactly-once behavior. An Activity may be retried after an error or an ambiguous outcome; the external service may have completed the request even when the Worker did not receive a confirming response.
Design side-effecting integrations for that possibility. Where the target system supports it, use idempotency keys or another deduplication mechanism. Otherwise, define how the application detects or reconciles an uncertain result before repeating an operation. Keep the unit of work and the retry consequences explicit.
Activity timeouts and retry behavior are operational design choices. Choose them around the external dependency and the consequence of repeating or delaying the operation. The Temporal .NET guide treats Activity execution, timeouts, asynchronous completion, and error handling as core topics; consult it for the current SDK configuration rather than assuming a single retry policy fits all Activities.
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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11How do Workflows wait for time or outside input?
Ordinary background jobs often poll, sleep, or exit and rely on another process to resume the work. A durable Workflow can instead wait as part of its recorded orchestration, then continue when its timer expires or a message arrives. This is useful for processes that span user action, a delayed follow-up, cancellation, or several dependent stages.
Use Workflow timers for time-based waits and the SDK’s message-passing mechanisms for outside input. The .NET guide also documents child Workflows and continue-as-new for Workflow structures that need them. A durable wait is not the same as keeping a .NET thread asleep; the Workflow’s history is what lets orchestration continue across Worker interruptions.
What must change when Workflow code changes?
An open Workflow can outlive a deployment. If a new version of its code makes different replay decisions for an existing Event History, replay may fail. Temporal’s .NET versioning guidance therefore calls for a versioning method when a code change is replay-incompatible.
Separate compatibility from rollout
- Identify the affected histories. Ask whether executions of this Workflow type may still be open when the new code is deployed.
- Check replay behavior. Determine whether the edit changes the Temporal API calls or their sequence for those histories.
- Choose a versioning approach. Keep a compatible path for executions that need it while allowing new executions to use the intended behavior, following the current .NET versioning guidance.
- Consider a new Workflow type. Temporal’s guidance notes this can be an alternative migration path when incompatible changes affect open executions of the same type.
Versioning is not a one-time deployment switch. The right strategy depends on the edit and on which executions may still be open. Treat Workflow history compatibility as part of release design, not as a concern to address only after a deployment breaks replay.
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Should you start locally or use Temporal Cloud?
The official quickstart provides both a local Temporal Service setup path and a Temporal Cloud path. The right starting point depends on whether the team wants a local development service or a cloud service for its deployment needs; the quickstart establishes those paths but does not provide a detailed comparison of features, pricing, regions, or service levels.
| Starting path | What the quickstart establishes | Decision to make |
|---|---|---|
| Local setup | A local Temporal Service setup is available as a quickstart path. | Whether a locally run service suits development and the team’s operational approach. |
| Temporal Cloud | Temporal Cloud is available as a separate quickstart path. | Whether the cloud service model suits the intended deployment and operational ownership. |
Do not infer product-level differences from the existence of two setup paths. Check current official service documentation for any specific capability, geography, price, or service-level requirement that affects the choice.
What does .NET 10 support mean for Temporal compatibility?
Microsoft lists .NET 10 as an LTS release, with a retirement date of November 15, 2028, on its lifecycle page. Microsoft’s release guidance describes LTS support as lasting at least three years, or one year after the next LTS release ships if that is later. Those dates describe Microsoft’s .NET support lifecycle, not a Temporal SDK compatibility promise.
The Temporal documentation reviewed for this article does not establish a .NET 10 compatibility matrix or a minimum runtime requirement for a particular SDK release. Before targeting .NET 10 in production, verify the runtime support declared for the exact Temporal .NET SDK package and its release or CI documentation. Do not infer SDK compatibility solely from .NET 10’s LTS status.
Quick Recap
A practical implementation sequence
- Choose the service path. Follow the official quickstart for local setup or Temporal Cloud.
- Define the orchestration. Identify the Workflow’s input, state transitions, durable waits, and the Activities it needs to schedule.
- Move external work into Activities. Keep API calls, database access, and other nondeterministic operations out of the replay path.
- Replace ordinary Workflow timers. Use Temporal’s Workflow time and timer APIs rather than
DateTime.Now,Task.Delay, orThread.Sleepin Workflow code. - Design for retries. Set Activity timeout and retry behavior according to the operation, and decide how side effects will handle ambiguous outcomes.
- Plan code evolution. Determine how open histories will replay before shipping a replay-incompatible change.
- Verify the runtime target. Check the selected SDK release’s declared support for .NET 10 rather than relying on the framework lifecycle alone.
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