CurrencyManager.Current 属性

  • 参考

定义

命名空间:
System.Windows.Forms
程序集:
System.Windows.Forms.dll

获取列表中的当前项。

public:
 virtual property System::Object ^ Current { System::Object ^ get(); };
public override object Current { get; }
public override object? Current { get; }
member this.Current : obj
Public Overrides ReadOnly Property Current As Object

属性值

Object

类型为 Object 的列表项。

示例

下面的代码示例使用 Current 属性打印 ContactName 列表中当前项的字段。

void GetCurrentItem()
{
   CurrencyManager^ myCurrencyManager;
   
   // Get the CurrencyManager of a TextBox control.
   myCurrencyManager = dynamic_cast<CurrencyManager^>(textBox1->BindingContext[nullptr]);
   
   // Get the current item cast as a DataRowView.
   DataRowView^ myDataRowView;
   myDataRowView = dynamic_cast<DataRowView^>(myCurrencyManager->Current);
   
   // Print the column named ContactName.
   Console::WriteLine( myDataRowView[ "ContactName" ] );
}

private void GetCurrentItem() {
    CurrencyManager myCurrencyManager;
    // Get the CurrencyManager of a TextBox control.
    myCurrencyManager = (CurrencyManager)textBox1.BindingContext[0];
    // Get the current item cast as a DataRowView.
    DataRowView myDataRowView;
    myDataRowView = (DataRowView) myCurrencyManager.Current;
    // Print the column named ContactName.
    Console.WriteLine(myDataRowView["ContactName"]);
}

Private Sub GetCurrentItem()
    Dim myCurrencyManager As CurrencyManager
    ' Get the CurrencyManager of a TextBox control.
    myCurrencyManager = CType(textBox1.BindingContext(0), CurrencyManager)
    ' Get the current item cast as a DataRowView.
    Dim myDataRowView As DataRowView
    myDataRowView = CType(myCurrencyManager.Current, DataRowView)
    ' Print the column named ContactName.
    Console.WriteLine(myDataRowView("ContactName"))
End Sub

注解

若要获取当前项，必须知道其数据类型才能正确强制转换。 例如，如果数据源为 DataView 或 DataTable，则必须将当前项强制转换为 DataRowView 对象。

适用于

另请参阅