Boxed Expression Types

Boxed Expressions can be used to define expressions and reuse them across logic documents.

You can add different types of expressions as boxed expressions.

• Formula: To write formulas
• Literal: To assign constants and literal formulas (without any parameters)
• Function: To assign a function with a list of expressions
• Native Method: To assign .NET native methods
• Embedded Model: To embed a document from the project

Formula

We use formulas to store expressions with parameters.

Properties

• Boxed Expression: The type of the boxed expression
• Expression: The expression you want to assign to the name
• Name: Name of the expression
• Parameters: The parameters used in the expression
  
  

Literal

Literals are used to store constant values or expressions that only contain literal values.

Properties

• Boxed Expression: The type of the boxed expression
• Expression: The expression you want to assign to the name
• Name: Name of the expression
• Type: Type of the formula’s expression result. Default is as the expression suggests or list as it will be translated to list.

Function

Functions can store a set of expressions as one function.

Properties

• Boxed Expression: The type of the boxed expression
• Expressions: The list of expressions you want to assign to the name
  
• Name: Name of the expression
• Parameters: The parameters used in the expressions
  
• Type: Type pf the formula’s expression result. Default is as an expression suggested or list as it will be translated into a list.

The expressions in a function will be executed according to the given order of expressions and the last expression’s output will be returned as the function’s output.

Native Methods

Native methods are used to define .NET Framework methods inside FlexRule.

You can add methods from the list of available functions in .NET Framework 4.7.

Properties

• Boxed Expression: The type of the boxed expression
• Name: Name of the expression
• Assembly: Assembly that has the type of implementation
• Method Signature: Signature of a static method of a type
• Type: Type of the native method

In the above figure, we use the method DateTime.DaysInMonth(Int32, Int32) .

Embedded Model

Embedded models are used to connect to an existing document such as a decision table.
For example, if you have a flow connecting to a REST API and you want to use this flow within a decision table, you can use an Embedded Model boxed expression.

Properties

• Boxed Expression: The expression you want to assign to the name
• Name: Name of the expression
• Logic Documents: The logic documents to be called

Sample Project

The attached project includes a set of examples for each expression type.