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BindingManagerBase.Current 屬性

定義

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; }
public abstract object? Current { get; }
member this.Current : obj
Public MustOverride ReadOnly Property Current As Object

屬性值

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 CustNameDataColumn

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 GetTypeToString 方法。

注意

DataSource當 是 DataSetDataViewManagerDataTable 時,您實際上是系結至 DataView 。 因此,每個 Current 物件都是 DataRowView 物件。

適用於

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