The Dashboard Designer provides the capability to create calculated fields that allow you to apply complex expressions to data fields that are obtained from the dashboard's data source. You can use these fields in data visualizations as regular data source fields.
Note that calculated fields are not supported for the OLAP data source.
Creating a Calculated Field
After you have created a data source, you can add a new calculated field based on the existing data source fields.
To create a calculated field, select the required data source (and the required query/data member, if applicable) in the Data Source Browser and click the Add Calculated Field button in the Ribbon's Data Source tab...
...or right-click the Field List and select Add Calculated Field in the context menu.
This invokes the Expression Editor dialog, which allows you to specify an expression that will be used to obtain calculated field values. Here, you can construct the required expression.
You can use the following elements in expressions.
Note that the type of a newly created calculated field is detected automatically based on the type of values returned by the specified expression. If you change this type, the expression will be wrapped to a corresponding conversion function (such as ToStr, ToDecimal, ToInt, etc.).
Changes the calculated field name.
Removes the existing calculated field from the data source.
Creating a Calculated Field in Code
A calculated field is represented by the CalculatedField class. To create a new calculated field, pass the required settings to the CalculatedField constructor or use the following properties.
To specify the type of the calculated field, insert the required conversion function (such as ToStr, ToDecimal, ToInt, etc.) into the calculated field's expression (the CalculatedField.Expression property). For instance, the following expression contains the ToDecimal conversion function that is used to change the default field type: