ListBox
This Control wraps the Win32 listbox common control, allowing you to display and select one or more items from a list. It derives from the ListControl abstract base class, in common with the ComboBox . You can add or remove objects in the list by using the Items collection. This could simply be a list of strings, but could equally be any object that can be converted to a string (which, in practice, means pretty much anything through the ToString() member). Alternatively, you can use data binding to bind to a data source. You can independently set a DisplayMember and a ValueMember . In either case, the selected item can be retrieved through the Text property (which returns the DisplayMember ) and SelectedValue (which returns the ValueMember ), or you can retrieve its index with the SelectedIndex property. The SelectionMode allows you to specify the various kinds of single- and multiple-selection modes available. If multiple selection is enabled, you can use the SelectedIndices and SelectedItems collections to enumerate the entire selection. You can select or deselect individual items using the SetSelected() method. If you need to locate a particular item in the list, you can use the FindString() and FindStringExact() methods . FindString() identifies the first item in the list that starts with the string specified, and is therefore extremely useful for those match-as-you-type controls. If the items added to the control are wider than the control itself, you can enable a HorizontalScrollbar . The HorizontalExtent property is then used to ensure that the scrollbar width is set to the maximum width of an item for the scrollbar to determine the appropriate range across which to scroll. You can also specify the ItemHeight in owner draw scenarios. (See DrawItemEventArgs for more information on owner draw). public class ListBox : ListControl { // Public Constructors public ListBox (); // Public Static Fields public const int DefaultItemHeight ; // =13 public const int NoMatches ; // =-1 // Public Instance Properties public override Color BackColor {set; get; } // overrides Control public override Image BackgroundImage {set; get; } // overrides Control public BorderStyle BorderStyle {set; get; } public int ColumnWidth {set; get; } public virtual DrawMode DrawMode {set; get; } public override Color ForeColor {set; get; } // overrides Control public int HorizontalExtent {set; get; } public bool HorizontalScrollbar {set; get; } public bool IntegralHeight {set; get; } public virtual int ItemHeight {set; get; } public ObjectCollection Items {get; } public bool MultiColumn {set; get; } public int PreferredHeight {get; } public override RightToLeft RightToLeft {set; get; } // overrides Control public bool ScrollAlwaysVisible {set; get; } public override int SelectedIndex {set; get; } // overrides ListControl public SelectedIndexCollection SelectedIndices {get; } public object SelectedItem {set; get; } public SelectedObjectCollection SelectedItems {get; } public virtual SelectionMode SelectionMode {set; get; } public bool Sorted {set; get; } public override string Text {set; get; } // overrides Control public int TopIndex {set; get; } public bool UseTabStops {set; get; } // Protected Instance Properties protected override CreateParams CreateParams {get; } // overrides Control protected override Size DefaultSize {get; } // overrides Control // Public Instance Methods public void BeginUpdate (); public void ClearSelected (); public void EndUpdate (); public int FindString (string s ); public int FindString (string s , int startIndex ); public int FindStringExact (string s ); public int FindStringExact (string s , int startIndex ); public int GetItemHeight (int index ); public Rectangle GetItemRectangle (int index ); public bool GetSelected (int index ); public int IndexFromPoint (int x , int y ); public int IndexFromPoint (System.Drawing.Point p ); public void SetSelected (int index , bool value ); public override string ToString (); // overrides System.ComponentModel.Component // Protected Instance Methods protected virtual void AddItemsCore (object[ ] value ); protected virtual ObjectCollection CreateItemCollection (); protected override void OnChangeUICues (UICuesEventArgs e ); // overrides Control protected override void OnDataSourceChanged (EventArgs e ); // overrides ListControl protected override void OnDisplayMemberChanged (EventArgs e ); // overrides ListControl protected virtual void OnDrawItem (DrawItemEventArgs e ); protected override void OnFontChanged (EventArgs e ); // overrides Control protected override void OnHandleCreated (EventArgs e ); // overrides Control protected override void OnHandleDestroyed (EventArgs e ); // overrides Control protected virtual void OnMeasureItem (MeasureItemEventArgs e ); protected override void OnParentChanged (EventArgs e ); // overrides Control protected override void OnResize (EventArgs e ); // overrides Control protected override void OnSelectedIndexChanged (EventArgs e ); // overrides ListControl protected override void RefreshItem (int index ); // overrides ListControl protected override void SetBoundsCore (int x , int y , int width , int height , BoundsSpecified specified ); // overrides Control protected override void SetItemCore (int index , object value ); // overrides ListControl protected override void SetItemsCore (System.Collections.IList value ); // overrides ListControl protected virtual void Sort (); protected virtual void WmReflectCommand (ref Message m ); protected override void WndProc (ref Message m ); // overrides Control // Events public event EventHandler Click ; // overrides Control public event DrawItemEventHandler DrawItem ; public event MeasureItemEventHandler MeasureItem ; public event PaintEventHandler Paint ; // overrides Control public event EventHandler SelectedIndexChanged ; } Hierarchy System.Object SubclassesCheckedListBox Passed ToObjectCollection.ObjectCollection() , SelectedIndexCollection.SelectedIndexCollection() , SelectedObjectCollection.SelectedObjectCollection() |
System.MarshalByRefObject 
EAN: 2147483647
Pages: 794