ListBox.Items 属性

定义

获取 ListBox 的项。Gets the items of the ListBox.

public:
 property System::Windows::Forms::ListBox::ObjectCollection ^ Items { System::Windows::Forms::ListBox::ObjectCollection ^ get(); };
public System.Windows.Forms.ListBox.ObjectCollection Items { get; }
member this.Items : System.Windows.Forms.ListBox.ObjectCollection
Public ReadOnly Property Items As ListBox.ObjectCollection

属性值

ListBox.ObjectCollection,表示 ListBox 中的项。An ListBox.ObjectCollection representing the items in the ListBox.

示例

下面的代码示例演示如何创建一个 ListBox 控件,该控件在列中显示多个项,并且可以在控件的列表中选择多个项。The following code example demonstrates how to create a ListBox control that displays multiple items in columns and can have more than one item selected in the control's list. 示例的代码使用 ListBox.ObjectCollection 类的 Add 方法将50项添加到 ListBox,然后使用 SetSelected 方法从列表中选择三项。The code for the example adds 50 items to the ListBox using the Add method of the ListBox.ObjectCollection class and then selects three items from the list using the SetSelected method. 然后,该代码显示来自 ListBox.SelectedObjectCollection 集合(通过 SelectedItems 属性)和 ListBox.SelectedIndexCollection 的值(通过 SelectedIndices 属性)。The code then displays values from the ListBox.SelectedObjectCollection collection (through the SelectedItems property) and the ListBox.SelectedIndexCollection (through the SelectedIndices property). 此示例要求代码位于 Form的和中。This example requires that the code is located in and called from a Form.

void button1_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
   
   // Create an instance of the ListBox.
   ListBox^ listBox1 = gcnew ListBox;
   
   // Set the size and location of the ListBox.
   listBox1->Size = System::Drawing::Size( 200, 100 );
   listBox1->Location = System::Drawing::Point( 10, 10 );
   
   // Add the ListBox to the form.
   this->Controls->Add( listBox1 );
   
   // Set the ListBox to display items in multiple columns.
   listBox1->MultiColumn = true;
   
   // Set the selection mode to multiple and extended.
   listBox1->SelectionMode = SelectionMode::MultiExtended;
   
   // Shutdown the painting of the ListBox as items are added.
   listBox1->BeginUpdate();
   
   // Loop through and add 50 items to the ListBox.
   for ( int x = 1; x <= 50; x++ )
   {
      listBox1->Items->Add( String::Format( "Item {0}", x ) );

   }
   listBox1->EndUpdate();
   
   // Select three items from the ListBox.
   listBox1->SetSelected( 1, true );
   listBox1->SetSelected( 3, true );
   listBox1->SetSelected( 5, true );
   
   #if defined(DEBUG)
   // Display the second selected item in the ListBox to the console.
   System::Diagnostics::Debug::WriteLine( listBox1->SelectedItems[ 1 ] );
   
   // Display the index of the first selected item in the ListBox.
   System::Diagnostics::Debug::WriteLine( listBox1->SelectedIndices[ 0 ] );
   #endif
}

private void button1_Click(object sender, System.EventArgs e)
{
   // Create an instance of the ListBox.
   ListBox listBox1 = new ListBox();
   // Set the size and location of the ListBox.
   listBox1.Size = new System.Drawing.Size(200, 100);
   listBox1.Location = new System.Drawing.Point(10,10);
   // Add the ListBox to the form.
   this.Controls.Add(listBox1);
   // Set the ListBox to display items in multiple columns.
   listBox1.MultiColumn = true;
   // Set the selection mode to multiple and extended.
   listBox1.SelectionMode = SelectionMode.MultiExtended;
 
   // Shutdown the painting of the ListBox as items are added.
   listBox1.BeginUpdate();
   // Loop through and add 50 items to the ListBox.
   for (int x = 1; x <= 50; x++)
   {
      listBox1.Items.Add("Item " + x.ToString());
   }
   // Allow the ListBox to repaint and display the new items.
   listBox1.EndUpdate();
      
   // Select three items from the ListBox.
   listBox1.SetSelected(1, true);
   listBox1.SetSelected(3, true);
   listBox1.SetSelected(5, true);

   // Display the second selected item in the ListBox to the console.
   System.Diagnostics.Debug.WriteLine(listBox1.SelectedItems[1].ToString());
   // Display the index of the first selected item in the ListBox.
   System.Diagnostics.Debug.WriteLine(listBox1.SelectedIndices[0].ToString());             
}

Private Sub button1_Click(sender As Object, e As System.EventArgs)
    ' Create an instance of the ListBox.
    Dim listBox1 As New ListBox()
    ' Set the size and location of the ListBox.
    listBox1.Size = New System.Drawing.Size(200, 100)
    listBox1.Location = New System.Drawing.Point(10, 10)
    ' Add the ListBox to the form.
    Me.Controls.Add(listBox1)
    ' Set the ListBox to display items in multiple columns.
    listBox1.MultiColumn = True
    ' Set the selection mode to multiple and extended.
    listBox1.SelectionMode = SelectionMode.MultiExtended
    
    ' Shutdown the painting of the ListBox as items are added.
    listBox1.BeginUpdate()
    ' Loop through and add 50 items to the ListBox.
    Dim x As Integer
    For x = 1 To 50
        listBox1.Items.Add("Item " & x.ToString())
    Next x
    ' Allow the ListBox to repaint and display the new items.
    listBox1.EndUpdate()
    
    ' Select three items from the ListBox.
    listBox1.SetSelected(1, True)
    listBox1.SetSelected(3, True)
    listBox1.SetSelected(5, True)
       
    ' Display the second selected item in the ListBox to the console.
    System.Diagnostics.Debug.WriteLine(listBox1.SelectedItems(1).ToString())
    ' Display the index of the first selected item in the ListBox.
    System.Diagnostics.Debug.WriteLine(listBox1.SelectedIndices(0).ToString())
End Sub

注解

此属性可让你获取对当前存储在 ListBox中的项列表的引用。This property enables you to obtain a reference to the list of items that are currently stored in the ListBox. 通过此引用,你可以添加项、移除项以及获取集合中项的计数。With this reference, you can add items, remove items, and obtain a count of the items in the collection. 有关可通过项集合执行的任务的详细信息,请参阅 ListBox.ObjectCollection 类参考主题。For more information about the tasks that can be performed with the item collection, see the ListBox.ObjectCollection class reference topics.

你还可以使用 DataSource 属性来操作 ListBox 的项。You can also manipulate the items of a ListBox by using the DataSource property. 如果使用 DataSource 属性将项添加到 ListBox中,则可以使用 Items 属性查看 ListBox 中的项,但不能使用 ListBox.ObjectCollection的方法在列表中添加或移除项。If you use the DataSource property to add items to a ListBox, you can view the items in the ListBox using the Items property but you cannot add or remove items from the list using the methods of the ListBox.ObjectCollection.

适用于

另请参阅