CheckedListBox.GetItemCheckState(Int32) 方法

定义

命名空间:

System.Windows.Forms

程序集:

System.Windows.Forms.dll

返回指示当前项的复选状态的值。

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

参数

index

Int32

要获取其选中值的项的索引。

返回

CheckState

CheckState 值之一。

例外

ArgumentOutOfRangeException

指定的 index 小于零。

- 或 -

指定的 index 大于或等于列表中项的计数。

示例

以下示例枚举 中 CheckedListBox.CheckedIndexCollection 选中的项，以查看项处于何种检查状态。 该示例演示如何使用 GetItemCheckState 方法设置项的检查状态。 该示例还演示如何使用 CheckedIndices 属性获取 CheckedListBox.CheckedIndexCollection ，使用 CheckedItems 属性获取 CheckedListBox.CheckedItemCollection。

给定项的索引，第一个循环使用 GetItemCheckState 方法获取 CheckState 每个已检查项的 。 第二个循环也使用 GetItemCheckState，但使用 ListBox.ObjectCollection.IndexOf 方法检索项的索引。

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

注解

方法 GetItemCheckState 提供获取项值（给定索引）的功能 CheckState 。 如果从未将项的检查状态设置为 Indeterminate，请使用 GetItemChecked 方法。

另请参阅

• GetItemChecked(Int32)
• CheckState