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Rule Condition Editor Dialog Box (Legacy)

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[This is prerelease documentation and is subject to change in future releases. Blank topics are included as placeholders.]

This topic describes how use the Rule Condition Editor dialog box in the legacy Windows Workflow Designer. Use the legacy Workflow Designer when you need to target either the .NET Framework version 3.5 or the .NET Framework 3.0.

You create and modify declarative rule conditions by using the Rule Condition Editor dialog box. These rule conditions are exposed as properties on the following Windows Workflow Foundation out-of-box activities:

You access the Rule Condition Editor dialog box by using the Select Condition Dialog Box (Legacy).

The following table describes the user interface (UI) elements of the Rule Condition Editor dialog box.

UI Element Description

Condition:

Enter the expression for the rule condition.

OK

Click to save the rule condition.

Entering Condition Expressions

Condition expressions are entered as text. You can type this. into the editor to reference fields, properties, and methods used in the workflow, using an IntelliSense-like menu. Or you can type a workflow member name directly. You can add logical operators to the condition, such as AND, OR, and NOT. You can also add predicates. A predicate is a binary operator and two operands. The binary operators supported are ==, >, <, >=, and <=. Supported operands are constant value, arithmetic function, and scoped public members.

You can specify the type for the comparison, and you can compare to null or an empty string. You can make nested calls to members on a variable that contains a complex type, for example, this.Address.State == "WA".

The Rule Condition Editor supports the following operators:

  • Relational operators: ==, =, !=

  • Comparison operators: <, <=, >, >=

  • Arithmetic operators: +, - , *, /, MOD

  • Logical operators: AND, &&, OR, ||, NOT, !

  • Bitwise operators: &, |

Expression operator precedence follows C# operator precedence rules.

The Rule Condition Editor supports the following numeric expressions:

this.i == 1D (resolves to 1.0)

this.i == 1E1 (resolves to 10.0)

this.i == 1L (resolves as a long)

this.i == 1M (resolves as a decimal)

this.i == 1F (resolves as a single)

this.i == 1U (resolves as an unsigned int)

For more information about conditions, see Using Conditions in Workflows.

See Also

Reference

Select Condition Dialog Box (Legacy)

Other Resources

Legacy Designer for Windows Workflow Foundation UI Help
IfElseActivity
ConditionedActivityGroup
ReplicatorActivity
WhileActivity
Using Conditions in Workflows

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Build Date:

2012-08-02