TreeListColumn.UnboundType Property
Gets or sets the data type and binding mode of the column.
Namespace: DevExpress.XtraTreeList.Columns
Assembly: DevExpress.XtraTreeList.v18.2.dll
Declaration
[DefaultValue(UnboundColumnType.Bound)]
[XtraSerializableProperty]
public UnboundColumnType UnboundType { get; set; }Property Value
| Type | Default | Description |
|---|---|---|
| UnboundColumnType | **Bound** | A UnboundColumnType value that specifies the data type and binding mode of the column. |
Available values:
| Name | Description |
|---|---|
| Object | Indicates that the column contains values of any type. |
| Integer | Indicates that the column contains integer values (the Int32 type). |
| Decimal | Indicates that the column contains decimal values (the Decimal type). |
| DateTime | Indicates that the column contains date-time values (the DateTime type). |
| String | Indicates that the column contains string values (the String type). |
| Boolean | Indicates that the column contains Boolean values (the Boolean type). |
| Bound | Indicates that the column is bound to a field in the control’s underlying data source. The type of data this column contains is determined by the bound field. |
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 TreeListColumn.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 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 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 UnboundColumnType topic for information on the available data types for unbound columns.
If the column’s UnboundType property is set to 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 TreeListColumn.FieldName property.
For unbound columns, you need to specify unique field names via the TreeListColumn.FieldName property.
Related GitHub Examples
The following code snippet (auto-collected from DevExpress Examples) contains a reference to the UnboundType property.
Note
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