Notes on software and the ideas behind it
Find the meaning
behind the code.
I’m Fred Yang. I write about software—how it works, why it behaves the way it does, and the ideas that make code easier to reason about.
Open the notebookWorking notes / 2026
Recently mapped
Architecture, reactivity, and the hidden relationships that shape frontend systems.
Diagnostic
Best practice of using Trace and Debug
class Program
{
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WF
Runtime Services
The workflow runtime engine supports the concept of external services. Services are class instances that you create and register with the runtime during application startup. Each service fulfills a defined purpose. Services come in...
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WF
Runtime Engine
WF includes a core runtime engine that is represented by the WorkflowRuntime class (found in the System.Workflow.Runtime namespace). The workflow runtime is not a self-contained application. Instead, an instance of this class must be...
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field note
Workflow Types
<h4>
Sequential Workflow
</h4>
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WF
Workflow basic
Workflow is simply an ordered series of steps that accomplished
some defined purpose according to
a set of rules. By that definition, what I just described is a workflow.
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