ListBox.SelectionMode 屬性

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

取得或設定 ListBox 中，用來選取項目的方法。

public:
 virtual property System::Windows::Forms::SelectionMode SelectionMode { System::Windows::Forms::SelectionMode get(); void set(System::Windows::Forms::SelectionMode value); };

public virtual System.Windows.Forms.SelectionMode SelectionMode { get; set; }

member this.SelectionMode : System.Windows.Forms.SelectionMode with get, set

Public Overridable Property SelectionMode As SelectionMode

屬性值

SelectionMode

其中一個 SelectionMode 值。 預設值為 SelectionMode.One。

例外狀況

InvalidEnumArgumentException

指派的值不是其中一個 SelectionMode 值。

範例

下列程式碼範例示範如何使用 GetSelected 方法來判斷 中 ListBox 選取的專案，以選取未選取的專案，並取消選取選取的專案。 此範例也會示範如何使用 SelectionMode 屬性讓 ListBox 擁有多個選取的專案，並使用 Sorted 屬性來示範如何自動排序專案中 ListBox 的專案。 這個範例要求 ListBox 已將名為 listBox1 的 ，加入至表單，而且 InitializeMyListBox 從表單的 事件呼叫 Load 範例中定義的 方法。

private:
   void InitializeMyListBox()
   {
      // Add items to the ListBox.
      listBox1->Items->Add( "A" );
      listBox1->Items->Add( "C" );
      listBox1->Items->Add( "E" );
      listBox1->Items->Add( "F" );
      listBox1->Items->Add( "G" );
      listBox1->Items->Add( "D" );
      listBox1->Items->Add( "B" );

      // Sort all items added previously.
      listBox1->Sorted = true;

      // Set the SelectionMode to select multiple items.
      listBox1->SelectionMode = SelectionMode::MultiExtended;

      // Select three initial items from the list.
      listBox1->SetSelected( 0, true );
      listBox1->SetSelected( 2, true );
      listBox1->SetSelected( 4, true );

      // Force the ListBox to scroll back to the top of the list.
      listBox1->TopIndex = 0;
   }

   void InvertMySelection()
   {
      // Loop through all items the ListBox.
      for ( int x = 0; x < listBox1->Items->Count; x++ )
      {
         // Select all items that are not selected,
         // deselect all items that are selected.
         listBox1->SetSelected( x,  !listBox1->GetSelected( x ) );
      }
      listBox1->TopIndex = 0;
   }

private void InitializeMyListBox()
{
   // Add items to the ListBox.
   listBox1.Items.Add("A");
   listBox1.Items.Add("C");
   listBox1.Items.Add("E");
   listBox1.Items.Add("F");
   listBox1.Items.Add("G");
   listBox1.Items.Add("D");
   listBox1.Items.Add("B");

   // Sort all items added previously.
   listBox1.Sorted = true;

   // Set the SelectionMode to select multiple items.
   listBox1.SelectionMode = SelectionMode.MultiExtended;

   // Select three initial items from the list.
   listBox1.SetSelected(0,true);
   listBox1.SetSelected(2,true);
   listBox1.SetSelected(4,true);

   // Force the ListBox to scroll back to the top of the list.
   listBox1.TopIndex=0;
}

private void InvertMySelection()
{
   // Loop through all items the ListBox.
   for (int x = 0; x < listBox1.Items.Count; x++)
   {
      // Determine if the item is selected.
      if(listBox1.GetSelected(x) == true)
         // Deselect all items that are selected.
         listBox1.SetSelected(x,false);      
      else
         // Select all items that are not selected.
         listBox1.SetSelected(x,true);
   }
   // Force the ListBox to scroll back to the top of the list.
   listBox1.TopIndex=0;
}

Private Sub InitializeMyListBox()
   ' Add items to the ListBox.
   listBox1.Items.Add("A")
   listBox1.Items.Add("C")
   listBox1.Items.Add("E")
   listBox1.Items.Add("F")
   listBox1.Items.Add("G")
   listBox1.Items.Add("D")
   listBox1.Items.Add("B")

   ' Sort all items added previously.
   listBox1.Sorted = True

   ' Set the SelectionMode to select multiple items.
   listBox1.SelectionMode = SelectionMode.MultiExtended

   ' Select three initial items from the list.
   listBox1.SetSelected(0, True)
   listBox1.SetSelected(2, True)
   listBox1.SetSelected(4, True)

   ' Force the ListBox to scroll back to the top of the list.
   listBox1.TopIndex = 0
End Sub

Private Sub InvertMySelection()

   Dim x As Integer
   ' Loop through all items the ListBox.
   For x = 0 To listBox1.Items.Count - 1

      ' Determine if the item is selected.
      If listBox1.GetSelected(x) = True Then
         ' Deselect all items that are selected.
         listBox1.SetSelected(x, False)
      Else
         ' Select all items that are not selected.
         listBox1.SetSelected(x, True)
      End If
   Next x
   ' Force the ListBox to scroll back to the top of the list.
   listBox1.TopIndex = 0
End Sub

備註

屬性 SelectionMode 可讓您判斷使用者可以一次選取多少個專案 ListBox ，以及使用者如何進行多重選取。 SelectionMode當 屬性設定為 SelectionMode.MultiExtended 時，按 SHIFT 並按一下滑鼠或按 SHIFT 鍵，以及其中一個方向鍵 (向上鍵、向下鍵、向左鍵和向右鍵) 將選取範圍從先前選取的專案延伸至目前專案。 按 CTRL 並按一下滑鼠會選取或取消選取清單中的專案。 當 屬性設定為 SelectionMode.MultiSimple 時，按一下滑鼠或按空格鍵會選取或取消選取清單中的專案。

另請參閱

• SelectionMode