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ListViewDataItem.DataItem Properti

  • Referensi

Definisi

Ruang nama:
System.Web.UI.WebControls
Rakitan:
System.Web.Extensions.dll

Mendapatkan atau mengatur objek data yang mendasar tempat objek terikat ListViewItem .

public:
 virtual property System::Object ^ DataItem { System::Object ^ get(); void set(System::Object ^ value); };
public virtual object DataItem { get; set; }
public override object DataItem { get; set; }
member this.DataItem : obj with get, set
Public Overridable Property DataItem As Object
Public Overrides Property DataItem As Object

Nilai Properti

Object

Objek data yang mendasar tempat ListViewItem objek terikat.

Contoh

Contoh berikut menunjukkan cara menggunakan DataItem properti untuk mengambil nilai bidang. Nilai kemudian digunakan untuk memilih item sebelumnya dalam DropDownList kontrol yang ditampilkan saat item berada dalam mode edit. Contoh kode ini adalah bagian dari contoh yang lebih besar yang disediakan untuk ListViewDataItem kelas .

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

Keterangan

Properti DataItem hanya tersedia selama dan setelah ItemDataBound peristiwa ListView kontrol.

Berlaku untuk

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