如何:确定 Windows 窗体 CheckedListBox 控件中的选定项

更新:2007 年 11 月

当显示 Windows 窗体 CheckedListBox 控件中的数据时,可以循环访问 CheckedItems 属性中存储的集合,或者使用 GetItemChecked 方法逐句通过列表来确定选中的项。GetItemChecked 方法接受一个项索引号作为参数,并返回 true 或 false。可能与您期望的相反,SelectedItemsSelectedIndices 属性并不确定哪些项已选中;它们确定哪些项为突出显示。

确定 CheckedListBox 控件中的已选中项

  1. 因为 CheckedItems 集合是从零开始的,所以请从 0 开始循环访问该集合。注意,此方法将向您提供项在已选中项列表而不是整个列表中的编号。因此,如果未选中列表中的第一项而选中了第二项,则下面的代码显示的文本将类似于“Checked Item 1 = MyListItem2”(选中的第 1 项 = MyListItem2)。

    ' Determine if there are any items checked.
    If CheckedListBox1.CheckedItems.Count <> 0 Then
       ' If so, loop through all checked items and print results.
       Dim x As Integer
       Dim s As String = ""
       For x = 0 To CheckedListBox1.CheckedItems.Count - 1
          s = s & "Checked Item " & (x + 1).ToString & " = " & CheckedListBox1.CheckedItems(x).ToString & ControlChars.CrLf
       Next x
       MessageBox.Show(s)
    End If
    
    // Determine if there are any items checked.
    if(checkedListBox1.CheckedItems.Count != 0)
    {
       // If so, loop through all checked items and print results.
       string s = "";
       for(int x = 0; x <= checkedListBox1.CheckedItems.Count - 1 ; x++)
       {
          s = s + "Checked Item " + (x+1).ToString() + " = " + checkedListBox1.CheckedItems[x].ToString() + "\n";
       }
    MessageBox.Show (s);
    }
    
    // Determine if there are any items checked.
    if ( checkedListBox1.get_CheckedItems().get_Count() != 0  ) 
    {
       // If so, loop through all checked items and print results.
       System.String s = "";
       for(int x=0;x <= checkedListBox1.get_CheckedItems().get_Count() - 1;x++)
       {
          s = s + "Checked Item " + Convert.ToString(++x) + " = " +          checkedListBox1.get_CheckedItems().get_Item(x).ToString() + "\n";
       } 
       MessageBox.Show(s);
    }
    
    // Determine if there are any items checked.
    if(checkedListBox1->CheckedItems->Count != 0)
    {
       // If so, loop through all checked items and print results.
       String ^ s = "";
       for(int x = 0; x <= checkedListBox1->CheckedItems->Count - 1; x++)
       {
          s = String::Concat(s, "Checked Item ", (x+1).ToString(),
             " = ", checkedListBox1->CheckedItems[x]->ToString(),
             "\n");
       }
       MessageBox::Show(s);
    }
    

    - 或 -

  2. 因为 Items 集合是从零开始的,所以请从 0 开始逐句通过该集合,并对每个项调用 GetItemChecked 方法。请注意,此方法将为您提供总体列表中的项号,因此如果未选中该列表中的第一个项,而选中了第二个项,则显示的内容类似“Item 2 = MyListItem2”。

    Dim i As Integer
    Dim s As String
    s = "Checked Items:" & ControlChars.CrLf
    For i = 0 To (CheckedListBox1.Items.Count - 1)
       If CheckedListBox1.GetItemChecked(i) = True Then
          s = s & "Item " & (i + 1).ToString & " = " & CheckedListBox1.Items(i).ToString & ControlChars.CrLf
       End If
    Next
    MessageBox.Show(s)
    
    int i;
    string s; 
    s = "Checked items:\n" ;
    for (i = 0; i <= (checkedListBox1.Items.Count-1); i++)
    {
       if (checkedListBox1.GetItemChecked(i))
       {
          s = s + "Item " + (i+1).ToString() + " = " + checkedListBox1.Items[i].ToString() + "\n";
       }
    }
    MessageBox.Show (s);
    
    int i;
    System.String s;
    s = "Checked items:\n";
    for(i = 0;i <= checkedListBox1.get_Items().get_Count() - 1;i ++)
    {
       if ( checkedListBox1.GetItemChecked(i)  ) 
       {
          s = s + "Item " + Convert.ToString(++i) + " = " + checkedListBox1.get_Item(i).ToString() + "\n";
       }
    } 
    MessageBox.Show(s);
    
    int i;
    String ^ s; 
    s = "Checked items:\n" ;
    for (i = 0; i <= (checkedListBox1->Items->Count-1); i++)
    {
       if (checkedListBox1->GetItemChecked(i))
       {
          s = String::Concat(s, "Item ", (i+1).ToString(), " = ",
             checkedListBox1->Item[i]->ToString(), "\n");
       }
    }
    MessageBox::Show(s);
    

请参见

其他资源

用于列出选项的 Windows 窗体控件