Windows Workflow Foundation Data Model

This topic applies to Windows Workflow Foundation 4 (WF4).

The Windows Workflow Foundation data model is composed of three concepts: variables, arguments, and expressions. Variables represent the storage of data and arguments represent the flow of data into and out of an activity. Arguments are bound (assigned a value) using expressions that may reference variables.

In This Section

• Variables and Arguments.
  Describes the concepts of variables and arguments and how they are used.

• Expressions
  Describes expressions and how they are used in workflow development.

• Properties vs. Arguments
  Describes how to select which type to use for activity input.

• Exposing data with CacheMetadata
  Describes how to expose a custom set of metadata about an executing activity's members.

Build Date: 2012-03-02