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ListItemCollection.Clear Metode

Definisi

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

Menghapus semua ListItem objek dari koleksi.

public:
 virtual void Clear();
public void Clear();
abstract member Clear : unit -> unit
override this.Clear : unit -> unit
Public Sub Clear ()

Penerapan

Clear()

Contoh

// Copy the items in the ListItemCollection to an array before 
// deleting them.     
ListItem[] myListItemArray = new ListItem[ListBox1.Items.Count];
ListBox1.Items.CopyTo(myListItemArray, 0);

// Delete all the items from the ListBox.
ListBox1.Items.Clear();
DeleteLabel.Text = "<b>All items in the ListBox were deleted successfully." 
    + "</b><br /><b>The deleted items are:";
String listResults="";
    foreach(ListItem myItem in myListItemArray)
    {
        listResults = listResults + myItem.Text + "<br />";
    }
ResultsLabel.Text = listResults;

' Copy the items in the ListListBox1.Items to an array before 
' deleting them.     
Dim myListItemArray(ListBox1.Items.Count - 1) As ListItem
ListBox1.Items.CopyTo(myListItemArray, 0)

' Delete all the items from the ListBox.
ListBox1.Items.Clear()
DeleteLabel.Text = "<b>All items in the ListBox were deleted successfully." & _
                   "</b><br /><b>The deleted items are:"
Dim listResults As [String] = ""
Dim myItem2 As ListItem
For Each myItem2 In myListItemArray
    listResults = listResults & myItem2.Text & "<br />"
Next myItem2
ResultsLabel.Text = listResults

Keterangan

Clear Gunakan metode untuk menghapus semua ListItem objek. Properti Count juga diatur ke 0.

Perhatian

Ketika Anda menggunakan metode ini, semua ListItem objek dihapus dari koleksi. Anda tidak dapat mengurungkan ini.

Berlaku untuk

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