DataRow.RowState プロパティ
DataRowCollection とのリレーションシップに関する、行の現在の状態を取得します。
Public ReadOnly Property RowState As DataRowState
[C#]
public DataRowState RowState {get;}
[C++]
public: __property DataRowState get_RowState();
[JScript]
public function get RowState() : DataRowState;
プロパティ値
DataRowState 値の 1 つ。
解説
RowState の値は、(1) この行に対して実行された操作の種類、(2) DataRow で AcceptChanges が呼び出されたかどうか、という 2 つの要因に依存します。
使用例
[Visual Basic, C#, C++] 最初に 1 列の新しい DataTable を作成してから、単一の DataRow を作成する例を次に示します。 DataRow の作成、追加、変更、および削除時に、その RowState が出力されます。
Private Sub DemonstrateRowState()
' Run a function to create a DataTable with one column.
Dim myTable As DataTable = MakeTable()
Dim myRow As DataRow
' Create a new DataRow.
myRow = myTable.NewRow()
' Detached row.
Console.WriteLine("New Row " & myRow.RowState)
myTable.Rows.Add(myRow)
' New row.
Console.WriteLine("AddRow " & myRow.RowState)
myTable.AcceptChanges()
' Unchanged row.
Console.WriteLine("AcceptChanges " & myRow.RowState)
myRow("FirstName") = "Scott"
' Modified row.
Console.WriteLine("Modified " & myRow.RowState)
myRow.Delete()
' Deleted row.
Console.WriteLine("Deleted " & myRow.RowState)
End Sub
Private Function MakeTable() As DataTable
' Make a simple table with one column.
Dim myTable As DataTable = New DataTable("myTable")
Dim dcFirstName As DataColumn = New DataColumn("FirstName", Type.GetType("System.String"))
myTable.Columns.Add(dcFirstName)
MakeTable = myTable
End Function
[C#]
private void DemonstrateRowState(){
// Run a function to create a DataTable with one column.
DataTable myTable = MakeTable();
DataRow myRow;
// Create a new DataRow.
myRow = myTable.NewRow();
// Detached row.
Console.WriteLine("New Row " + myRow.RowState);
myTable.Rows.Add(myRow);
// New row.
Console.WriteLine("AddRow " + myRow.RowState);
myTable.AcceptChanges();
// Unchanged row.
Console.WriteLine("AcceptChanges " + myRow.RowState);
myRow["FirstName"] = "Scott";
// Modified row.
Console.WriteLine("Modified " + myRow.RowState);
myRow.Delete();
// Deleted row.
Console.WriteLine("Deleted " + myRow.RowState);
}
private DataTable MakeTable(){
// Make a simple table with one column.
DataTable myTable = new DataTable("myTable");
DataColumn dcFirstName = new DataColumn("FirstName", Type.GetType("System.String"));
myTable.Columns.Add(dcFirstName);
return myTable;
}
[C++]
private:
void DemonstrateRowState(){
// Run a function to create a DataTable with one column.
DataTable* myTable = MakeTable();
DataRow* myRow;
// Create a new DataRow.
myRow = myTable->NewRow();
// Detached row.
Console::WriteLine(S"New Row {0}", __box(myRow->RowState));
myTable->Rows->Add(myRow);
// New row.
Console::WriteLine(S"AddRow {0}", __box(myRow->RowState));
myTable->AcceptChanges();
// Unchanged row.
Console::WriteLine(S"AcceptChanges {0}", __box(myRow->RowState));
myRow->Item[S"FirstName"] = S"Scott";
// Modified row.
Console::WriteLine(S"Modified {0}", __box(myRow->RowState));
myRow->Delete();
// Deleted row.
Console::WriteLine(S"Deleted {0}", __box(myRow->RowState));
}
DataTable* MakeTable(){
// Make a simple table with one column.
DataTable* myTable = new DataTable(S"myTable");
DataColumn* dcFirstName = new DataColumn(S"FirstName", Type::GetType(S"System.String"));
myTable->Columns->Add(dcFirstName);
return myTable;
}
[JScript] JScript のサンプルはありません。Visual Basic、C#、および C++ のサンプルを表示するには、このページの左上隅にある言語のフィルタ ボタン をクリックします。
必要条件
プラットフォーム: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 ファミリ, .NET Compact Framework - Windows CE .NET
参照
DataRow クラス | DataRow メンバ | System.Data 名前空間 | AcceptChanges | BeginEdit | Add | CancelEdit | DataTable | DataRowView | Delete | EndEdit | NewRow