Spread Windows Forms 6.0 Product Documentation
Understanding the Optional Interfaces
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Spread Windows Forms 6.0 Product Documentation > Developer's Guide > Understanding the Underlying Models > Understanding the Optional Interfaces

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Besides the interfaces that are dedicated to each of the specific models, there are also optional interfaces that provide additional support and may be used when making custom models. These optional interfaces and the customizations they allow are summarized in this table:

Optional Interface Customizations Allowed

Allows customization of support for getting and setting arrays of values in a range of cells


Allows customization of data binding on a sheet


Allows customization of hierarchical data models for hierarchies on a sheet; used in conjunction with IDataSourceSupport

ICalculationSupport, ICustomFunctionSupport, ICustomNameSupport, IExpressionSupport, IExpressionSupport2, IIterationSupport

Allows customization of formulas on a sheet; ICustomFunctionSupport, ICustomNameSupport, and IIterationSupport are not useful without IExpressionSupport

IDisjointSelections, IQuerySelection

Allows customization of an ordered array of cell ranges containing the selected cells with the minimal overlap between the ranges on a sheet

INamedStyle, IParseFormatSupport

Allows customization of collections of custom styles in the style model


Allows customization of non-empty counts to find out which rows or columns have data in the cells of that row or column on a sheet

IOptimizedEnumerationSupport, IOptimizedEnumerationSupport2

Allows customization of optimized enumeration for iterating to the next non-empty row or column on a sheet

IMovable, IRangeSupport

Allows customization of moving, inserting, and deleting rows and columns support for a range of cells on a sheet; also covers clear, copy, move, and swap support


Allows customization of unbound rows with data binding on a sheet; used in conjunction with IDataSourceSupport

None of these optional interfaces are required for saving Excel or text files, or for printing. For more detailed information on these interfaces, refer to the FarPoint.Win.Spread.Model namespace in the Assembly Reference.

For more information on formulas in cells, refer Managing Formulas in Cells.

Return to the overview of Understanding the Underlying Models.

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