DataRow.Delete DataRow.Delete DataRow.Delete DataRow.Delete Method

定義

DataRow を削除します。Deletes the DataRow.

public:
 void Delete();
public void Delete ();
member this.Delete : unit -> unit
Public Sub Delete ()

例外

次の例では、単純なDataTable2 つの列と 10 行にします。The following example creates a simple DataTable with two columns and ten rows. いくつか削除した後DataRowのアイテムをDeleteを呼び出すことによって、行のいずれかのメソッドが戻したRejectChangesします。After deleting several DataRow items with the Delete method, one of the rows is undeleted by invoking RejectChanges.

private void DemonstrateDeleteRow()
{
    // Create a simple DataTable with two columns and ten rows.
    DataTable table = new DataTable("table");
    DataColumn idColumn = new DataColumn("id",
        Type.GetType("System.Int32"));
    idColumn.AutoIncrement=true;
    DataColumn itemColumn = new DataColumn("item", 
        Type.GetType("System.String"));
    table.Columns.Add(idColumn);
    table.Columns.Add(itemColumn);

    // Add ten rows.
    DataRow newRow;
     
    for(int i = 0; i <10; i++)
    {
        newRow = table.NewRow();
        newRow["item"] = "Item " + i;
        table.Rows.Add(newRow);
    }
    table.AcceptChanges();

    DataRowCollection itemColumns = table.Rows;
    itemColumns[0].Delete();
    itemColumns[2].Delete();
    itemColumns[3].Delete();
    itemColumns[5].Delete();
    Console.WriteLine(itemColumns[3].RowState.ToString());

    // Reject changes on one deletion.
    itemColumns[3].RejectChanges();

    // Change the value of the column so it stands out.
    itemColumns[3]["item"] = "Deleted, Undeleted, Edited";

    // Accept changes on others.
    table.AcceptChanges();

    // Print the remaining row values.
    foreach(DataRow row in table.Rows)
    {
        Console.WriteLine(row[0] + "\table" + row[1]);
    }
}
 Private Sub DemonstrateDeleteRow()
     ' Create a simple DataTable with two columns and ten rows.
     Dim table As New DataTable("table")
     Dim idColumn As New DataColumn("id", Type.GetType("System.Int32"))
     idColumn.AutoIncrement = True
     Dim itemColumn As New DataColumn("item", Type.GetType("System.String"))
     table.Columns.Add(idColumn)
     table.Columns.Add(itemColumn)

     ' Add ten rows.
     Dim newRow As DataRow
     
     Dim i As Integer
     For i = 0 To 9
         newRow = table.NewRow()
         newRow("item") = "Item " & i.ToString()
         table.Rows.Add(newRow)
     Next i
     table.AcceptChanges()

     Dim itemColumns As DataRowCollection = table.Rows
     itemColumns(0).Delete()
     itemColumns(2).Delete()
     itemColumns(3).Delete()
     itemColumns(5).Delete()
     Console.WriteLine(itemColumns(3).RowState.ToString())

     ' Reject changes on one deletion.
     itemColumns(3).RejectChanges()

     ' Change the value of the column so it stands out.
     itemColumns(3)("item") = "Deleted, Undeleted, Edited"

     ' Accept changes on others.
     table.AcceptChanges()

     ' Print the remaining row values.
     Dim row As DataRow
     For Each row In  table.Rows
         Console.WriteLine(row(0).ToString() & ControlChars.Tab _
            & row(1).ToString())
     Next row
End Sub

注釈

場合、RowStateの行が追加、RowStateなりますDetachedを呼び出すときにテーブルから行を削除してAcceptChangesします。If the RowState of the row is Added, the RowState becomes Detached and the row is removed from the table when you call AcceptChanges.

RowStateなりますDeletedを使用した後、Delete既存メソッドDataRowします。The RowState becomes Deleted after you use the Delete method on an existing DataRow. これは、ままになりますDeletedを呼び出すまでAcceptChangesします。It remains Deleted until you call AcceptChanges. この時点で、DataRowテーブルから削除されます。At this time, the DataRow is removed from the table.

Delete 反復処理中に、foreach ループで呼び出すことはできません、DataRowCollectionオブジェクト。Delete should not be called in a foreach loop while iterating through a DataRowCollection object. Delete コレクションの状態を変更します。Delete modifies the state of the collection.

呼び出すことによって削除された行を戻すできますRejectChangesします。A deleted row can be undeleted by invoking RejectChanges.

注意

BeginEditメソッドを一時的に中断RowChangingイベントが削除操作しません。The BeginEdit method temporarily suspends RowChanging events, but the delete operation does not.

適用対象

こちらもご覧ください