BindingManagerBase.Current 屬性

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

當在衍生類別中覆寫時，取得目前物件。

public:
 abstract property System::Object ^ Current { System::Object ^ get(); };

public abstract object? Current { get; }

member this.Current : obj

Public MustOverride ReadOnly Property Current As Object

屬性值

Object

表示目前物件的 Object。

範例

下列程式碼範例會在 事件中 BindingManagerBaseCurrentChanged 列印 物件的值 Current 。 此範例假設資料來源是包含 DataTable 名為 CustName 的 DataColumn 。

void Current_Changed( Object^ sender, EventArgs^ /*e*/ )
{
   BindingManagerBase^ bm = dynamic_cast<BindingManagerBase^>(sender);
   
   /* Check the type of the Current object. If it is not a 
           DataRowView, exit the method. */
   if ( bm->Current->GetType() != DataRowView::typeid )
         return;

   // Otherwise, print the value of the column named "CustName".
   DataRowView^ drv = dynamic_cast<DataRowView^>(bm->Current);
   Console::Write( "CurrentChanged): " );
   Console::Write( drv[ "CustName" ] );
   Console::WriteLine();
}

private void Current_Changed(object sender, EventArgs e)
{
    BindingManagerBase bm = (BindingManagerBase) sender;
    /* Check the type of the Current object. If it is not a 
    DataRowView, exit the method. */
    if(bm.Current.GetType() != typeof(DataRowView)) return;

    // Otherwise, print the value of the column named "CustName".
    DataRowView drv = (DataRowView) bm.Current;
    Console.Write("CurrentChanged): ");
    Console.Write(drv["CustName"]);
    Console.WriteLine();
}

Private Sub Current_Changed(sender As Object, e As EventArgs)
    Dim bm As BindingManagerBase = CType(sender, BindingManagerBase)
    ' Check the type of the Current object. If it is not a
    ' DataRowView, exit the method. 
    If bm.Current.GetType() IsNot GetType(DataRowView) Then
        Return
    End If 
    ' Otherwise, print the value of the column named "CustName".
    Dim drv As DataRowView = CType(bm.Current, DataRowView)
    Console.Write("CurrentChanged): ")
    Console.Write(drv("CustName"))
    Console.WriteLine()
End Sub

備註

物件 Current 包含資料來源中目前專案的值。 若要使用目前專案的值，您必須將專案 Type 轉換成 包含 DataSource 之 物件的 。 例如， DataTable 包含 DataRowView 物件。 若要判斷目前物件的類型，請使用 GetType 和 ToString 方法。

注意

DataSource當 是 DataSet 、 DataViewManager 或 DataTable 時，您實際上是系結至 DataView 。 因此，每個 Current 物件都是 DataRowView 物件。

另請參閱

• CurrentChanged
• Position