CheckedListBox.ObjectCollection 类

定义

public: ref class CheckedListBox::ObjectCollection : System::Windows::Forms::ListBox::ObjectCollection

public class CheckedListBox.ObjectCollection : System.Windows.Forms.ListBox.ObjectCollection

type CheckedListBox.ObjectCollection = class
    inherit ListBox.ObjectCollection

Public Class CheckedListBox.ObjectCollection
Inherits ListBox.ObjectCollection

继承

Object

ListBox.ObjectCollection

CheckedListBox.ObjectCollection

示例

以下示例枚举 中的 CheckedListBox 项，并检查列表中的所有其他项。 该示例演示如何使用 Items 属性获取 CheckedListBox.ObjectCollection 来获取 Count 项的 。

该示例还演示如何使用 SetItemCheckState 和 SetItemChecked 方法来设置项的检查状态。 对于要检查的其他每个项， SetItemCheckState 调用 以将 设置为 CheckStateIndeterminate，而 SetItemChecked 对另一项调用 以将选中状态设置为 Checked。

void CheckEveryOther_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
   
   // Cycle through every item and check every other.
   // Set flag to true to know when this code is being executed. Used in the ItemCheck
   // event handler.
   insideCheckEveryOther = true;
   for ( int i = 0; i < checkedListBox1->Items->Count; i++ )
   {
      
      // For every other item in the list, set as checked.
      if ( (i % 2) == 0 )
      {
         
         // But for each other item that is to be checked, set as being in an
         // indeterminate checked state.
         if ( (i % 4) == 0 )
                     checkedListBox1->SetItemCheckState( i, CheckState::Indeterminate );
         else
                     checkedListBox1->SetItemChecked( i, true );
      }

   }
   insideCheckEveryOther = false;
}

private void CheckEveryOther_Click(object sender, System.EventArgs e) {
    // Cycle through every item and check every other.

    // Set flag to true to know when this code is being executed. Used in the ItemCheck
    // event handler.
    insideCheckEveryOther = true;

    for (int i = 0; i < checkedListBox1.Items.Count; i++) {
        // For every other item in the list, set as checked.
        if ((i % 2) == 0) {
            // But for each other item that is to be checked, set as being in an
            // indeterminate checked state.
            if ((i % 4) == 0)
                checkedListBox1.SetItemCheckState(i, CheckState.Indeterminate);
            else
                checkedListBox1.SetItemChecked(i, true);
        }
    }

    insideCheckEveryOther = false;
}

Private Sub CheckEveryOther_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CheckEveryOther.Click
    ' Cycle through every item and check every other.
    Dim i As Integer

    ' Set flag to true to know when this code is being executed. Used in the ItemCheck
    ' event handler.
    insideCheckEveryOther = True

    For i = 0 To CheckedListBox1.Items.Count - 1
        ' For every other item in the list, set as checked.

        If ((i Mod 2) = 0) Then
            ' But for each other item that is to be checked, set as being in an
            ' indeterminate checked state.

            If ((i Mod 4) = 0) Then
                CheckedListBox1.SetItemCheckState(i, CheckState.Indeterminate)
            Else
                CheckedListBox1.SetItemChecked(i, True)
            End If
        End If
    Next

    insideCheckEveryOther = False

End Sub

注解

通过 属性从父控件 CheckedListBox访问 Items 集合。 若要创建对象集合以显示在控件中CheckedListBox，可以使用 和 Remove 方法单独Add添加或删除项。