CurrencyManager.Current 属性
重要
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获取列表中的当前项。
public:
virtual property System::Object ^ Current { System::Object ^ get(); };C#
public override object Current { get; }C#
public override object? Current { get; }member this.Current : objPublic Overrides ReadOnly Property Current As Object类型为 Object 的列表项。
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" ] );
}
C#
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
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。
| 产品 | 版本 |
|---|---|
| .NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
| Windows Desktop | 3.0, 3.1, 5, 6, 7, 8, 9, 10 |
