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View this topic on docs.devexpress.com (Learn more)

TreeListColumn.UnboundType Property

Gets or sets the data type and binding mode of the column.

Namespace:DevExpress.XtraTreeList.Columns
Assembly:DevExpress.XtraTreeList.v19.1.dll

Expanded Syntax

Property value

Type: UnboundColumnType
A UnboundColumnType value that specifies the data type and binding mode of the column.
The default is UnboundColumnType.Bound.

Expanded Remarks

You can create Unbound Columns in the Tree List. These are columns that aren't bound to any field in the control's data source (see TreeList.DataSource). Data for unbound columns can be provided using one of two methods:

  • setting a formula (string expression) to the UnboundExpression property. In expressions, you can refer to other columns, and use various functions and operators. See Expressions, to learn about the syntax.
  • handling the TreeList.CustomUnboundColumnData event. This event can also be used to save any changes made by an end-user in unbound columns via the Tree List.

To make a column unbound, set its UnboundType property to a DevExpress.Data.UnboundColumnType value that corresponds to the type of data the column will display. For example, if the column is supposed to display integer values, set the UnboundType property to DevExpress.Data.UnboundColumnType.Integer. The data type specified by the UnboundType property determines which editor should be used, by default, to edit the column's values. In addition, it also determines how values are aligned within the column and which sorting and validity rules should be applied to this column. See the DevExpress.Data.UnboundColumnType topic for information on the available data types for unbound columns.

If the column's UnboundType property is set to DevExpress.Data.UnboundColumnType.Bound it's assumed that this column is not unbound and it is bound to a specific field in the data source, specified by the FieldName property.

For unbound columns, you need to specify unique field names via the FieldName property.

Expanded Example

The following example creates a TreeList (see TreeList) at runtime and shows how to perform basic customization tasks:

  • Bind the treelist to a data source
  • Specify the key fields that form a hierarchy
  • Access automatically created columns
  • Set a custom row height
  • Customize column captions (using HTML tags) and cell appearance settings
  • Create unbound columns and create Excel-style format conditions based on these column values
  • Assign an in-place editor (a spin editor) to columns
  • Sort data
  • Calculate total summaries
  • Filter nodes
  • Hide columns and calculate column "best" widths
  • Locate and expand nodes
  • Focus a specific cell
  • Specify DataAnnotation attributes at the data source level (the "p0" display format for the MarketShare field)

Expanded See Also

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