BindingManagerBase.Current 屬性

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

當在衍生類別中被覆寫時，會得到目前的物件。

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

代表 Object 當前物件的 。

範例

以下程式碼範例在事件中列印物件的值 CurrentBindingManagerBaseCurrentChanged 。 範例假設資料來源包含 DataTable 一個 DataColumn 名為 CustName的 。

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

該 Current 物件包含資料來源中當前項目的值。 要使用當前項目的值，你必須將該項目鑄造成 包含於 的物件 DataSource。Type 例如，a DataTable 包含 DataRowView 物件。 要判斷目前物件的類型，請使用 GetType and ToString 方法。

Note

當 是 DataSourceDataSet、 DataViewManager或 DataTable時，你實際上綁定於 DataView。 因此，每個 Current 物體都是物 DataRowView 體。

另請參閱

• CurrentChanged
• Position