DataRow.Delete 方法

定義

命名空間:

System.Data

組件:

netstandard.dll, System.Data.Common.dll

來源:

DataRow.cs

刪除 DataRow.

public:
 void Delete();

public void Delete();

member this.Delete : unit -> unit

Public Sub Delete ()

例外狀況

DeletedRowInaccessibleException

那個已經 DataRow 被刪除了。

範例

以下範例建立一個兩欄十列的簡單體 DataTable 。 在使用該Delete方法刪除多個DataRow項目後，透過呼叫 RejectChanges來恢復刪除其中一列。

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

備註

若該列的 為 RowStateAdded，則 RowState 變 Detached 為 ，且該列立即從表格中移除。

在你對現有DataRow的 使用 Delete S 方法後，就RowState變成Deleted了 直到你打電話AcceptChanges為止。Deleted 此時，該牌 DataRow 被從桌上移除。

Delete 在物件 DataRowCollection 遍歷時，不應在 foreach 迴圈中被呼叫。 Delete 修改集合的狀態。

刪除的列可透過調用 RejectChanges來恢復刪除。

備註

此 BeginEdit 方法會暫時暫停 RowChanging 事件，但刪除操作不會。

另請參閱

• DataRowState
• DataViewRowState
• RowState
• 使用 ADO.NET