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     Binding to a Collection of Columns
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     Binding to a Collection of Conditional Formatting Rules
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 End-User Documentation

Binding to a Collection of Conditional Formatting Rules

When engineering a WPF application using the Model View ViewModel (MVVM) architectural pattern, you may be required to describe conditional formatting rules in a Model or ViewModel. The grid can be bound to a collection of objects containing conditional formatting rules, described in a Model or ViewModel, thus minimizing the need for 'code-behind'.

Expanded View Model Implementation

The example used in this topic contains a view model code that includes the following classes.

  • Order - a data object that contains order information (e.g., quantity, discount, etc.).
  • ViewModel - the order view model. The ViewModel exposes the Orders property (a list of orders displayed within the grid) and the Rules property (a list of formatting rules).
  • OrderData - supplies order information to be displayed within the grid control.
  • FormattingRule - describes a conditional formatting rule. This class provides properties that correspond to settings common to all types of conditional formatting rules.
  • FormattingType - enumerates possible types of applied formattings.
Note

If the format conditions collection might be changed after it has been assigned to the grid control, it should implement INotifyCollectionChanged, so that changes made within a View Model are automatically reflected by the grid.

Expanded Format Condition Templates and Selector

The GridControl generates condition formattings based on condition formattings templates. Create multiple templates, one template for each condition formatting type. Using a single template, you can create an unlimited number of condition formattings in unlimited number of grid controls. In this example, there are three condition formatting templates: FontFormat, BackgroundFormat, and IconFormat.

To avoid performance issues when binding to column properties, use the dxci:DependencyObjectExtensions.DataContext attached property. See the example below.

To choose the required template based on the column's type, use the Template Selector. In this example, the template selector is represented by the FormatConditionSelector class.

Note

If all conditional formattings can be described using a single template, you have no need to create a template selector. Instead, assign this template to the grid View's TableView.FormatConditionGeneratorTemplate (TreeListView.FormatConditionGeneratorTemplate for the TreeListView) property.

Expanded Customizing the GridControl

Finally, specify the grid View's FormatConditionGeneratorTemplateSelector and FormatConditionsSource properties. The TableView.FormatConditionsSource (TreeListView.FormatConditionsSource) property specifies the source from which the grid generates conditional formattings. The TableView.FormatConditionGeneratorTemplateSelector (TreeListView.FormatConditionGeneratorTemplateSelector) property specifies the template selector, which returns a template for each conditional formatting based on its type.

The image below shows the result.

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