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CheckedListBox.GetItemCheckState(Int32) 方法

定義

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

其中一個 CheckState 值。

例外狀況

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.CheckedIndexCollectionCheckedItems 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。

適用於

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