ListViewDataItem.DataItem 属性

定义

命名空间:

System.Web.UI.WebControls

程序集:

System.Web.Extensions.dll

获取或设置 ListViewItem 对象绑定到的基础数据对象。

public:
 virtual property System::Object ^ DataItem { System::Object ^ get(); void set(System::Object ^ value); };

public override object DataItem { get; set; }

member this.DataItem : obj with get, set

Public Overrides Property DataItem As Object

属性值

Object

ListViewItem 对象绑定到的基础数据对象。

示例

以下示例演示如何使用 DataItem 属性检索字段值。 然后，该值用于预选择控件中的 DropDownList 项，该控件在项处于编辑模式时显示。 此代码示例是为 ListViewDataItem 类提供的一个更大示例的一部分。

protected void ContactsListView_ItemDataBound(object sender, ListViewItemEventArgs e)
{

  //Verify there is an item being edited.
  if (ContactsListView.EditIndex >= 0)
  {

    //Get the item object.
    ListViewDataItem dataItem = (ListViewDataItem)e.Item;

    // Check for an item in edit mode.
    if (dataItem.DisplayIndex == ContactsListView.EditIndex)
    {

      // Preselect the DropDownList control with the Title value
      // for the current item.

      // Retrieve the underlying data item. In this example
      // the underlying data item is a DataRowView object.        
      DataRowView rowView = (DataRowView)dataItem.DataItem;

      // Retrieve the Title value for the current item. 
      String title = rowView["Title"].ToString();

      // Retrieve the DropDownList control from the current row. 
      DropDownList list = (DropDownList)dataItem.FindControl("TitlesList");

      // Find the ListItem object in the DropDownList control with the 
      // title value and select the item.
      ListItem item = list.Items.FindByText(title);
      list.SelectedIndex = list.Items.IndexOf(item);
                      
    }
  }
}

Protected Sub ContactsListView_ItemDataBound(ByVal sender As Object, ByVal e As ListViewItemEventArgs) 
    
  'Verify there is an item being edited.
  If ContactsListView.EditIndex >= 0 Then
    
    'Get the item object.
    Dim dataItem As ListViewDataItem = CType(e.Item, ListViewDataItem)
    
    ' Check for an item in edit mode.
    If dataItem.DisplayIndex = ContactsListView.EditIndex Then
        
      ' Preselect the DropDownList control with the Title value
      ' for the current item.
      ' Retrieve the underlying data item. In this example
      ' the underlying data item is a DataRowView object.        
      Dim rowView As DataRowView = CType(dataItem.DataItem, DataRowView)
      
      ' Retrieve the Title value for the current item. 
      Dim title As String = rowView("Title").ToString()
      
      ' Retrieve the DropDownList control from the current row. 
      Dim list As DropDownList = CType(dataItem.FindControl("TitlesList"), DropDownList)
      
      ' Find the ListItem object in the DropDownList control with the 
      ' title value and select the item.
      Dim item As ListItem = list.Items.FindByText(title)
      list.SelectedIndex = list.Items.IndexOf(item)
    End If 
  End If

End Sub

注解

属性DataItem仅在 控件事件ListView期间和之后ItemDataBound可用。

另请参阅

• DataItemIndex
• ListView Web 服务器控件