DataSet.Relations 屬性
定義
重要
部分資訊涉及發行前產品,在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊,不做任何明確或隱含的瑕疵擔保。
取得關聯的集合,這些關聯會連結資料表,並允許從父資料表巡覽至子資料表。
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
屬性值
包含 DataRelationCollection 物件集合的 DataRelation。 如果沒有任何 DataRelation 物件存在,則會傳回空的集合。
- 屬性
範例
下列範例會透過 Relations 屬性列印所有子數據表的數據行名稱。
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