ListView.CheckedItems 属性

定义

命名空间:

System.Windows.Forms

程序集:

System.Windows.Forms.dll

Source:

ListView.cs

获取控件中当前选中的项。

C#

[System.ComponentModel.Browsable(false)]
public System.Windows.Forms.ListView.CheckedListViewItemCollection CheckedItems { get; }

属性值

ListView.CheckedListViewItemCollection

ListView.CheckedListViewItemCollection，包含当前选中的项。 如果当前未选中任何项，则返回空的 ListView.CheckedListViewItemCollection。

属性

BrowsableAttribute

示例

下面的代码示例演示了处理 事件的 ItemChecked checked ListView 。 该示例使用 CheckedItems 属性来记录每次选中或取消选中某个项时的新价格。 若要运行此示例，请将以下代码粘贴到包含 ListView 名为 ListView1 和 TextBox 的 Textbox1窗体中。 InitializeListView从窗体的构造函数或Load方法调用 方法。

C#

private void InitializeListView()
{
    this.ListView1 = new System.Windows.Forms.ListView();

    // Set properties such as BackColor and DockStyle and Location.
    this.ListView1.BackColor = System.Drawing.SystemColors.Control;
    this.ListView1.Dock = System.Windows.Forms.DockStyle.Top;
    this.ListView1.Location = new System.Drawing.Point(0, 0);
    this.ListView1.Size = new System.Drawing.Size(292, 130);
    this.ListView1.View = System.Windows.Forms.View.Details;
    this.ListView1.HideSelection = false;

    // Allow the user to select multiple items.
    this.ListView1.MultiSelect = true;

    // Show CheckBoxes in the ListView.
    this.ListView1.CheckBoxes = true;
    
    //Set the column headers and populate the columns.
    ListView1.HeaderStyle = ColumnHeaderStyle.Nonclickable;
    
    ColumnHeader columnHeader1 = new ColumnHeader();
    columnHeader1.Text = "Breakfast Choices";
    columnHeader1.TextAlign = HorizontalAlignment.Left;
    columnHeader1.Width = 146;

    ColumnHeader columnHeader2 = new ColumnHeader();
    columnHeader2.Text = "Price Each";
    columnHeader2.TextAlign = HorizontalAlignment.Center;
    columnHeader2.Width = 142;

    this.ListView1.Columns.Add(columnHeader1);
    this.ListView1.Columns.Add(columnHeader2);

    string[] foodList = new string[]{"Juice", "Coffee", 
        "Cereal & Milk", "Fruit Plate", "Toast & Jelly", 
        "Bagel & Cream Cheese"};

    string[] foodPrice = new string[]{"1.09", "1.09", "2.19", 
        "2.79", "2.09", "2.69"};
    
    int count;

    // Members are added one at a time, so call BeginUpdate to ensure 
    // the list is painted only once, rather than as each list item is added.
    ListView1.BeginUpdate();

    for(count = 0; count < foodList.Length; count++)
    {
        ListViewItem listItem = new ListViewItem(foodList[count]);
        listItem.SubItems.Add(foodPrice[count]);
        ListView1.Items.Add(listItem);
    }

    //Call EndUpdate when you finish adding items to the ListView.
    ListView1.EndUpdate();
    this.Controls.Add(this.ListView1);
}

C#

// Handles the ItemChecked event.  The method loops through all the 
// checked items and tallies a new price each time an item is 
// checked or unchecked. It outputs the price to TextBox1.
private void ListView1_ItemCheck2(object sender, 
    System.Windows.Forms.ItemCheckEventArgs e)
{
    double price = 0.0;
    ListView.CheckedListViewItemCollection checkedItems = 
        ListView1.CheckedItems;
    
    foreach ( ListViewItem item in checkedItems )
    {
        price += Double.Parse(item.SubItems[1].Text);
    }
    if (e.CurrentValue==CheckState.Unchecked)
    {
        price += Double.Parse(
            this.ListView1.Items[e.Index].SubItems[1].Text);
    }
    else if((e.CurrentValue==CheckState.Checked))
    {
        price -= Double.Parse(
            this.ListView1.Items[e.Index].SubItems[1].Text);
    }
    // Output the price to TextBox1.
    TextBox1.Text = price.ToString();
}

注解

仅当控件的 属性设置为 true时，CheckBoxesListView此属性才有用。 属性 CheckedItems 返回一个集合，该集合包含控件中签入的所有项。 有关如何操作集合中的项的详细信息，请参阅 ListView.CheckedListViewItemCollection。

如果要获取控件中ListView选中的项的 内的ListView.ListViewItemCollection索引位置的集合，请使用 属性，而不是选中的CheckedIndices项。

适用于

另请参阅

• ListView.CheckedListViewItemCollection
• CheckedIndices