CheckedListBox.CheckedItems 屬性

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

來源:

CheckedListBox.cs

本書中已檢查項目 CheckedListBox的集合。

public:
 property System::Windows::Forms::CheckedListBox::CheckedItemCollection ^ CheckedItems { System::Windows::Forms::CheckedListBox::CheckedItemCollection ^ get(); };

[System.ComponentModel.Browsable(false)]
public System.Windows.Forms.CheckedListBox.CheckedItemCollection CheckedItems { get; }

[<System.ComponentModel.Browsable(false)>]
member this.CheckedItems : System.Windows.Forms.CheckedListBox.CheckedItemCollection

Public ReadOnly Property CheckedItems As CheckedListBox.CheckedItemCollection

屬性值

CheckedListBox.CheckedItemCollection

CheckedListBox.CheckedItemCollection集合 CheckedListBox。

屬性

BrowsableAttribute

範例

以下範例列舉了 中 CheckedListBox.CheckedIndexCollection 檢查過的項目，以查看項目處於哪種檢查狀態。 範例示範使用 CheckedIndices 性質取得 CheckedListBox.CheckedIndexCollection，以及 CheckedItemsCheckedListBox.CheckedItemCollection性質 得到 。

第一個迴圈使用GetItemCheckState方法，根據項目的索引取得每個檢查項目的 。CheckState 第二個迴圈同樣使用 GetItemCheckState，但使用 該 ListBox.ObjectCollection.IndexOf 方法來取得該項目的索引。

執行此範例時，請執行以下步驟：

1. 建立新的 Windows Form 應用程式。

2. 將 a CheckedListBox 和 a Button 新增至表單。

3. 命名按鈕 WhatIsChecked，為其 Click 事件新增一個處理器，然後從下一個處理器的主體複製程式碼。

4. 新增一些項目到 CheckedListBox.

5. 執行範例並勾選清單中的勾選框。

6. 按一下按鈕。

   你會看到一系列訊息框，標示哪些項目被勾選。

void WhatIsChecked_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
   
   // Display in a message box all the items that are checked.
   // First show the index and check state of all selected items.
   IEnumerator^ myEnum1 = checkedListBox1->CheckedIndices->GetEnumerator();
   while ( myEnum1->MoveNext() )
   {
      Int32 indexChecked =  *safe_cast<Int32^>(myEnum1->Current);
      
      // The indexChecked variable contains the index of the item.
      MessageBox::Show( String::Concat( "Index#: ", indexChecked, ", is checked. Checked state is: ", checkedListBox1->GetItemCheckState( indexChecked ), "." ) );
   }

   
   // Next show the Object* title and check state for each item selected.
   IEnumerator^ myEnum2 = checkedListBox1->CheckedItems->GetEnumerator();
   while ( myEnum2->MoveNext() )
   {
      Object^ itemChecked = safe_cast<Object^>(myEnum2->Current);
      
      // Use the IndexOf method to get the index of an item.
      MessageBox::Show( String::Concat( "Item with title: \"", itemChecked, "\", is checked. Checked state is: ", checkedListBox1->GetItemCheckState( checkedListBox1->Items->IndexOf( itemChecked ) ), "." ) );
   }
}

private void WhatIsChecked_Click(object sender, System.EventArgs e) {
    // Display in a message box all the items that are checked.

    // First show the index and check state of all selected items.
    foreach(int indexChecked in checkedListBox1.CheckedIndices) {
        // The indexChecked variable contains the index of the item.
        MessageBox.Show("Index#: " + indexChecked.ToString() + ", is checked. Checked state is:" +
                        checkedListBox1.GetItemCheckState(indexChecked).ToString() + ".");
    }

    // Next show the object title and check state for each item selected.
    foreach(object itemChecked in checkedListBox1.CheckedItems) {

        // Use the IndexOf method to get the index of an item.
        MessageBox.Show("Item with title: \"" + itemChecked.ToString() +
                        "\", is checked. Checked state is: " +
                        checkedListBox1.GetItemCheckState(checkedListBox1.Items.IndexOf(itemChecked)).ToString() + ".");
    }
}

Private Sub WhatIsChecked_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles WhatIsChecked.Click
    ' Display in a message box all the items that are checked.
    Dim indexChecked As Integer
    Dim itemChecked As Object
    Const quote As String = """"

    ' First show the index and check state of all selected items.
    For Each indexChecked In CheckedListBox1.CheckedIndices
        ' The indexChecked variable contains the index of the item.
        MessageBox.Show("Index#: " + indexChecked.ToString() + ", is checked. Checked state is:" + _
                        CheckedListBox1.GetItemCheckState(indexChecked).ToString() + ".")
    Next

    ' Next show the object title and check state for each item selected.
    For Each itemChecked In CheckedListBox1.CheckedItems

        ' Use the IndexOf method to get the index of an item.
        MessageBox.Show("Item with title: " + quote + itemChecked.ToString() + quote + _
                        ", is checked. Checked state is: " + _
                        CheckedListBox1.GetItemCheckState(CheckedListBox1.Items.IndexOf(itemChecked)).ToString() + ".")
    Next

End Sub

備註

集合是集合中 Items 物件的子集，僅代表那些 是 System.Windows.Forms.CheckState 或 CheckedIndeterminate的項目。 本收藏中的索引依升序排列。

另請參閱

• CheckedListBox.CheckedItemCollection