DataRelation Constructor (String, DataColumn, DataColumn, Boolean)
Initializes a new instance of the DataRelation class using the specified name, parent and child DataColumn objects, and a value that indicates whether to create constraints.
Namespace: System.Data
Assembly: System.Data (in System.Data.dll)
public: DataRelation( String^ relationName, DataColumn^ parentColumn, DataColumn^ childColumn, bool createConstraints )
Parameters
- relationName
- Type: System::String
The name of the relation. If nullptr or an empty string (""), a default name will be given when the created object is added to the DataRelationCollection.
- parentColumn
- Type: System.Data::DataColumn
The parent DataColumn in the relation.
- childColumn
- Type: System.Data::DataColumn
The child DataColumn in the relation.
- createConstraints
- Type: System::Boolean
A value that indicates whether constraints are created. true, if constraints are created. Otherwise, false.
| Exception | Condition |
|---|---|
| ArgumentNullException | One or both of the DataColumn objects contains nullptr. |
| InvalidConstraintException | The columns have different data types -Or- The tables do not belong to the same DataSet. |
The following example creates a new DataRelation and adds it to the DataRelationCollection of a DataSet.
Private Sub CreateRelation() ' Code to get the DataSet not shown here. ' Get the DataColumn objects from two DataTable ' objects in a DataSet. Dim parentColumn As DataColumn = DataSet1.Tables( _ "Customers").Columns("CustID") Dim childColumn As DataColumn = _ DataSet1.Tables("Orders").Columns("CustID") ' Create DataRelation. Dim bConstraints As Boolean = True Dim customerOrdersRelation As DataRelation = _ New DataRelation("CustomersOrders", _ parentColumn, childColumn, bConstraints) ' Add the relation to the DataSet. DataSet1.Relations.Add(customerOrdersRelation) End Sub
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
