DataRowState 列舉
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 DataRow 物件的狀態。
此列舉支援其成員值的位元組合。
public enum class DataRowState
[System.Flags]
public enum DataRowState
[<System.Flags>]
type DataRowState =
Public Enum DataRowState
- 繼承
- 屬性
欄位
Added | 4 | 資料列已經加入至 DataRowCollection,並且尚未呼叫 AcceptChanges()。 |
Deleted | 8 | |
Detached | 1 | 資料列已建立,但它不屬於任何 DataRowCollection。 DataRow 在已經建立後、加入至集合前,或如果已經從集合移除後,會立即處在這個狀態中。 |
Modified | 16 | 已經修改資料列,並且尚未呼叫 AcceptChanges()。 |
Unchanged | 2 | 資料列從上次呼叫 AcceptChanges() 之後就未變更。 |
範例
下列範例會先使用一個資料列建立新的 DataTable ,然後建立單 DataRow一 。 建立、新增、修改和刪除時 DataRow ,會列印其 RowState 。
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 dt = new DataTable("myTable");
DataColumn dcFirstName = new DataColumn("FirstName", Type.GetType("System.String"));
dt.Columns.Add(dcFirstName);
return dt;
}
Private Sub DemonstrateRowState()
'Run a function to create a DataTable with one column.
Dim dataTable As DataTable = MakeTable()
Dim dataRow As DataRow
' Create a new DataRow.
dataRow = dataTable.NewRow()
' Detached row.
Console.WriteLine(String.Format("New Row {0}", dataRow.RowState))
dataTable.Rows.Add(dataRow)
' New row.
Console.WriteLine(String.Format("AddRow {0}", dataRow.RowState))
dataTable.AcceptChanges()
' Unchanged row.
Console.WriteLine(String.Format("AcceptChanges {0}", dataRow.RowState))
dataRow("FirstName") = "Scott"
' Modified row.
Console.WriteLine(String.Format("Modified {0}", dataRow.RowState))
dataRow.Delete()
' Deleted row.
Console.WriteLine(String.Format("Deleted {0}", dataRow.RowState))
End Sub
Private Function MakeTable() As DataTable
' Make a simple table with one column.
Dim dt As New DataTable("dataTable")
Dim firstName As New DataColumn("FirstName", _
Type.GetType("System.String"))
dt.Columns.Add(firstName)
Return dt
End Function
備註
列舉DataRowState是由 類別的 DataRow 屬性傳RowState回。