GanttDependencyMappings.PredecessorFieldName Property
Gets or sets the data source field that specifies a task’s predecessor. Use a task’s key to specify the predecessor.
Namespace: DevExpress.XtraGantt
Assembly: DevExpress.XtraGantt.v23.2.dll
NuGet Package: DevExpress.Win.Gantt
Declaration
[DefaultValue("PredecessorID")]
[DXCategory("Mappings")]
[XtraSerializableProperty]
public string PredecessorFieldName { get; set; }Property Value
| Type | Default | Description |
|---|---|---|
| String | "PredecessorID" | The data source field that specifies a task’s predecessor. |
Remarks
The KeyFieldName property specifies the data field that stores a task’s unique identifier (key). These keys are used to specify dependencies between tasks.
Finish-to-Start Dependencies
The control’s DataSource property allows you to bind the control to a data source. The ChartMappings property provides access to data fields mapped to task properties that specify how a task is displayed in the chart area. The PredecessorsFieldName property specifies the data field that stores keys of task predecessors. Note that this data field allows you to specify finish-to-start dependencies only without time lag.
The data field can be of the following types:
String — the string should contain keys separated by space, comma, or semicolon (‘ ‘, ‘,’ ‘;’).
IEnumerable — the enumerator should return key values of the same type as the key field.
For example, an IList object allows users to modify dependencies and save changes to the data source. The collection should not be read only.
Dependencies of Any Types
The DependencySource property allows you to bind the control to a data source that can store dependencies. Note that this additional data source allows you to specify dependencies of any type (finish-to-start, finish-to-finish, and so on) and any time lags.
If the data source contains multiple tables, use the DataMember property to specify the table that contains dependencies.
The DependencyMappings property allows you to specify data fields that should be mapped to dependency properties:
PredecessorFieldName— a predecessor task’s key.- SuccessorFieldName — a successor task’s key.
- TypeFieldName — a dependency type. The data type should be DependencyType or Int32.
- LagFieldName — a time lag between the predecessor and successor tasks. The data type should be TimeSpan.
ganttControl1.DependencyMappings.PredecessorFieldName = "Predecessor";
ganttControl1.DependencyMappings.SuccessorFieldName = "Successor";
ganttControl1.DependencyMappings.TypeFieldName = "Type";
ganttControl1.DependencyMappings.LagFieldName = "Lag";
See the following topic for more information: Task Dependencies.
Obtain or Set Dependencies in Code
Use the following methods to obtain an object that contains data for a specific dependency:
GetDependencyRow(Int32, Int32) — Returns an Object in the bound data source that contains data for the specified dependency.
GetDependencyDataRow(Int32, Int32) — Returns a DataRow in the bound DataTable that contains data for the specified dependency.
To specify the node in the method’s parameter, use the node’s Id property value.
The SetDependency(GanttControlNode, GanttControlNode, DependencyType, TimeSpan) method allows you to specify a dependency in code.