DataSet.Relations Property
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Gets the collection of relations that link tables and allow navigation from parent tables to child tables.
public:
property System::Data::DataRelationCollection ^ Relations { System::Data::DataRelationCollection ^ get(); };
public System.Data.DataRelationCollection Relations { get; }
[System.Data.DataSysDescription("DataSetRelationsDescr")]
public System.Data.DataRelationCollection Relations { get; }
member this.Relations : System.Data.DataRelationCollection
[<System.Data.DataSysDescription("DataSetRelationsDescr")>]
member this.Relations : System.Data.DataRelationCollection
Public ReadOnly Property Relations As DataRelationCollection
Property Value
A DataRelationCollection that contains a collection of DataRelation objects. An empty collection is returned if no DataRelation objects exist.
- Attributes
Examples
The following example prints the column name of all child tables through the Relations property.
Private Sub PrintChildRelationRows()
' Declare variable to hold the row values.
Dim rowValues As String
Dim dataSet As DataSet
' Get the DataSet of a DataGrid that is displaying data
' of at least two tables.
Dim table As DataTable = CType(DataGrid1.DataSource, DataTable)
' Navigate using the Relations.
Dim relation As DataRelation
Dim row As DataRow
Dim column As DataColumn
' Print the names of each column in each table.
For Each relation In dataSet.Relations
For Each column in relation.ChildTable.Columns
rowValues &= column.ColumnName & " "
Next
Next
' Display results.
Console.WriteLine(rowValues)
End Sub
Applies to
See also
Pripomienky
https://aka.ms/ContentUserFeedback.
Pripravujeme: V priebehu roka 2024 postupne zrušíme službu Problémy v službe GitHub ako mechanizmus pripomienok týkajúcich sa obsahu a nahradíme ju novým systémom pripomienok. Ďalšie informácie nájdete na stránke:Odoslať a zobraziť pripomienky pre