CurrencyManager.Current 属性

获取列表中的当前项。

**命名空间:**System.Windows.Forms
**程序集:**System.Windows.Forms（在 system.windows.forms.dll 中）

语法

声明
Public Overrides ReadOnly Property Current As Object
用法
Dim instance As CurrencyManager
Dim value As Object

value = instance.Current

public override Object Current { get; }

public:
virtual property Object^ Current {
    Object^ get () override;
}

/** @property */
public Object get_Current ()

public override function get Current () : Object

属性值

类型为 Object 的列表项。

备注

要获取当前项，必须知道该项的数据类型才能对其进行正确地强制转换。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。

示例

下面的代码示例使用 Current 属性打印列表当前项的 ContactName 字段。

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 'GetCurrentItem

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"]);
}

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.
        get_BindingContext().get_Item((Int32)0));
    // Get the current item cast as a DataRowView.
    DataRowView myDataRowView;
    myDataRowView = (DataRowView)(myCurrencyManager.get_Current());
    // Print the column named ContactName.
    Console.WriteLine(myDataRowView.get_Item("ContactName"));
} //GetCurrentItem

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

平台

Windows 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition

.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。

版本信息

.NET Framework

受以下版本支持：2.0、1.1、1.0

.NET Compact Framework

受以下版本支持：2.0、1.0

请参见

参考

CurrencyManager 类
CurrencyManager 成员
System.Windows.Forms 命名空间
DataRowView
List
Position
CurrencyManager.Count 属性