BindingSource.ResetItem(Int32) 方法

  • 参考

定义

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

使绑定到 BindingSource 的控件重新读取指定索引处的项，并刷新其显示值。

public:
 void ResetItem(int itemIndex);
public void ResetItem (int itemIndex);
member this.ResetItem : int -> unit
Public Sub ResetItem (itemIndex As Integer)

参数

itemIndex
Int32

已更改的项的从零开始的索引。

示例

下面的代码示例使用 组件 BindingSource 将列表绑定到控件 DataGridView 。 列表不会引发更改通知，因此 ResetItem ， 上的 BindingSource 方法用于引发 ListChanged 事件。 此代码示例是 如何：使用 BindingSource ResetItem 方法引发更改通知中提供的更大示例的一部分。

// This event handler changes the value of the CompanyName
// property for the first item in the list.
void changeItemBtn_Click( Object^ /*sender*/, EventArgs^ /*e*/ )
{
   // Get a reference to the list from the BindingSource.
   List< DemoCustomer^ >^ customerList =
      static_cast<List< DemoCustomer^ >^>(
        this->customersBindingSource->DataSource);
   
   // Change the value of the CompanyName property for the
   // first item in the list.
   customerList->default[ 0 ]->CompanyName = L"Tailspin Toys";
   
   // Call ResetItem to alert the BindingSource that the
   // list has changed.
   this->customersBindingSource->ResetItem( 0 );
}

// This event handler changes the value of the CompanyName
// property for the first item in the list.
void changeItemBtn_Click(object sender, EventArgs e)
{
    // Get a reference to the list from the BindingSource.
    List<DemoCustomer> customerList = 
        this.customersBindingSource.DataSource as List<DemoCustomer>;

    // Change the value of the CompanyName property for the 
    // first item in the list.
    customerList[0].CompanyName = "Tailspin Toys";

    // Call ResetItem to alert the BindingSource that the 
    // list has changed.
    this.customersBindingSource.ResetItem(0);
}

' This event handler changes the value of the CompanyName
' property for the first item in the list.
Private Sub changeItemBtn_Click(ByVal sender As Object, ByVal e As EventArgs) _
   Handles changeItemBtn.Click

    ' Get a reference to the list from the BindingSource.
    Dim customerList As List(Of DemoCustomer) = _
    CType(Me.customersBindingSource.DataSource, List(Of DemoCustomer))

    ' Change the value of the CompanyName property for the 
    ' first item in the list.
    customerList(0).CompanyName = "Tailspin Toys"

    ' Call ResetItem to alert the BindingSource that the 
    ' list has changed.
    Me.customersBindingSource.ResetItem(0)

End Sub

注解

方法 ResetItem 通知绑定到指定 Position 处的 项的所有控件刷新其值。 方法通过引发 ListChanged 设置为 的事件 ListChangedEventArgs.ListChangedType 来 ListChangedType.ItemChanged执行此操作。

ResetItem 每当对单个项的值进行更改时，都会自动调用 。 但是，程序员也可以显式调用此方法。

适用于

另请参阅