DataRow.HasVersion(DataRowVersion) 方法

定義

取得值,指出是否有指定的版本。Gets a value that indicates whether a specified version exists.

public:
 bool HasVersion(System::Data::DataRowVersion version);
public bool HasVersion (System.Data.DataRowVersion version);
member this.HasVersion : System.Data.DataRowVersion -> bool
Public Function HasVersion (version As DataRowVersion) As Boolean

參數

version
DataRowVersion

其中一個 DataRowVersion 值,指定資料列的版本。One of the DataRowVersion values that specifies the row version.

傳回

如果版本存在,則為 true,否則為 falsetrue if the version exists; otherwise, false.

範例

下列範例會使用 HasVersion 方法,判斷資料行的目前值和建議的值是否相同。The following example uses the HasVersion method to determine whether the current value of a column and the proposed value are the same. 若是如此,則會取消編輯。If so, the edit is canceled. 否則,會呼叫 AcceptChanges 方法來結束編輯。Otherwise, the AcceptChanges method is called to end the edit.

Private Sub CheckVersionBeforeAccept()
    ' Assuming the DataGrid is bound to a DataTable.
    Dim table As DataTable = CType(DataGrid1.DataSource, DataTable)
    Dim row As DataRow = table.Rows(DataGrid1.CurrentCell.RowNumber)
    row.BeginEdit
    row(1) = Edit1.Text
    If row.HasVersion(datarowversion.Proposed) Then
       If row(1, DataRowVersion.Current) Is _
            row(1, DataRowversion.Proposed) Then
          Console.WriteLine("The original and the proposed are the same")
          row.CancelEdit
          Exit Sub
       Else
          row.AcceptChanges
       End If
    Else
       Console.WriteLine("No new values proposed")
    End If
End Sub

備註

如需詳細資訊,請參閱 BeginEdit 方法。See the BeginEdit method for more information.

適用於

另請參閱