DataTable.ParentRelations 属性

定义

命名空间:

System.Data

程序集:

System.Data.Common.dll

Source:

DataTable.cs

获取该 DataTable 的父关系的集合。

public:
 property System::Data::DataRelationCollection ^ ParentRelations { System::Data::DataRelationCollection ^ get(); };

[System.ComponentModel.Browsable(false)]
public System.Data.DataRelationCollection ParentRelations { get; }

[<System.ComponentModel.Browsable(false)>]
member this.ParentRelations : System.Data.DataRelationCollection

Public ReadOnly Property ParentRelations As DataRelationCollection

属性值

DataRelationCollection

一个 DataRelationCollection，包含该表的父关系。 如果 DataRelation 对象不存在，将返回空集合。

属性

BrowsableAttribute

示例

以下示例使用 ParentRelations 属性返回 中的每个DataTable父级DataRelation。 然后，每个关系都用作 的 方法DataRow中的GetParentRows参数，以返回行数组。 然后打印行中每列的值。

private void GetChildRowsFromDataRelation(DataTable table)
{
    DataRow[] rowArray;
    foreach(DataRelation relation in table.ParentRelations)
    {
        foreach(DataRow row in table.Rows)
        {
            rowArray = row.GetParentRows(relation);
            // Print values of rows.
            for(int i = 0; i < rowArray.Length; i++)
            {
                foreach(DataColumn column in table.Columns)
                {
                    Console.WriteLine(rowArray[i][column]);
                }
            }
        }
    }
}

Private Sub GetChildRowsFromDataRelation(table As DataTable)
    Dim rowArray() As DataRow
    Dim relation As DataRelation, row As DataRow
    Dim column As DataColumn, i As Integer     
    For Each relation In  table.ParentRelations
        For Each row In  table.Rows
            rowArray = row.GetParentRows(relation)
            ' Print values of rows.             
            For i = 0 To rowArray.Length - 1                 
                For Each column In  table.Columns
                    Console.WriteLine(rowArray(i)(column))
                Next column
            Next i
        Next row
    Next relation
End Sub

另请参阅

• ChildRelations
• DataRelation
• DataSet
• Relations
• DataTables