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ListView.EndUpdate Method

Resumes drawing of the list view control after drawing is suspended by the BeginUpdate method.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

public void EndUpdate ()
public void EndUpdate ()
public function EndUpdate ()
Not applicable.

The preferred way to add multiple items to a ListView is to use the AddRange method of the ListView.ListViewItemCollection (accessed through the Items property of the ListView). This enables you to add an array of items to the list in a single operation. However, if you want to add items one at a time using the Add method of the ListView.ListViewItemCollection class, you can use the BeginUpdate method to prevent the control from repainting the ListView each time an item is added. Once you have completed the task of adding items to the control, call the EndUpdate method to enable the ListView to repaint. This way of adding items can prevent flickered drawing of the ListView when a large number of items are being added to the control.

If BeginUpdate is called more than once, EndUpdate must be called an equivalent number of times. Until the last call to EndUpdate the ListView will not repaint. Other than this, multiple calls to BeginUpdate have no effect.

The following code example demonstrates initializing a ListView control to contain check boxes. It also demonstrates using the BeginUpdate and EndUpdate methods. To run this example, paste the following code into a form containing a ListView named ListView1. Call the InititalizeListView method from the form's constructor or Load method.

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);
}

private void InitializeListView()
{
    this.listView1 = new System.Windows.Forms.ListView();
    // Set properties such as BackColor and DockStyle and Location.
    this.listView1.set_BackColor(System.Drawing.SystemColors.get_Control());
    this.listView1.set_Dock(System.Windows.Forms.DockStyle.Top);
    this.listView1.set_Location(new System.Drawing.Point(0, 0));
    this.listView1.set_Size(new System.Drawing.Size(292, 130));
    this.listView1.set_View(System.Windows.Forms.View.Details);
    this.listView1.set_HideSelection(false);
    // Allow the user to select multiple items.
    this.listView1.set_MultiSelect(true);
    // Show CheckBoxes in the ListView.
    this.listView1.set_CheckBoxes(true);
    //Set the column headers and populate the columns.
    listView1.set_HeaderStyle(ColumnHeaderStyle.Nonclickable);

    ColumnHeader columnHeader1 = new ColumnHeader();
    columnHeader1.set_Text("Breakfast Choices");
    columnHeader1.set_TextAlign(HorizontalAlignment.Left);
    columnHeader1.set_Width(146);

    ColumnHeader columnHeader2 = new ColumnHeader();
    columnHeader2.set_Text("Price Each");
    columnHeader2.set_TextAlign(HorizontalAlignment.Center);
    columnHeader2.set_Width(142);

    this.listView1.get_Columns().Add(columnHeader1);
    this.listView1.get_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((String)foodList.get_Item(count));
        listItem.get_SubItems().Add((String)foodPrice.get_Item(count));
        listView1.get_Items().Add(listItem);
    }
    //Call EndUpdate when you finish adding items to the ListView.
    listView1.EndUpdate();
    this.get_Controls().Add(this.listView1);
} //InitializeListView

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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