CheckedListBox.GetItemCheckState(Int32) 方法

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

傳回指示目前項目之選取狀態的值。

public:
 System::Windows::Forms::CheckState GetItemCheckState(int index);

public System.Windows.Forms.CheckState GetItemCheckState (int index);

member this.GetItemCheckState : int -> System.Windows.Forms.CheckState

Public Function GetItemCheckState (index As Integer) As CheckState

參數

index

Int32

要取得其選取值之項目的索引。

傳回

CheckState

其中一個 CheckState 值。

例外狀況

ArgumentOutOfRangeException

指定的 index 小於零。

-或-

指定的 index 大於或等於清單中項目的計數。

範例

下列範例會列舉 中的 CheckedListBox.CheckedIndexCollection 已核取專案，以查看專案所在的檢查狀態。 此範例示範如何使用 GetItemCheckState 方法來設定專案的檢查狀態。 此範例也會示範如何使用 CheckedIndices 屬性來取得 CheckedListBox.CheckedIndexCollection 和 CheckedItems 屬性以取得 CheckedListBox.CheckedItemCollection 。

第一個迴圈會 GetItemCheckState 使用 方法來取得 CheckState 每個已檢查項目的 ，並指定專案的索引。 第二個迴圈也會使用 GetItemCheckState ，但會使用 ListBox.ObjectCollection.IndexOf 方法來擷取專案的索引。

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

方法 GetItemCheckState 提供在指定索引的情況下取得 CheckState 專案值的能力。 如果您從未將專案的檢查狀態設定為 Indeterminate ，請使用 GetItemChecked 方法。

另請參閱

• GetItemChecked(Int32)
• CheckState