TextBoxBase

TextBoxBase

marshal by reference, disposable

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System. Windows .Forms (system. windows .forms.dll)

abstract class

This is the base class for the TextBox and RichTextBox classes. It provides the base functionality for a Control into which the user can type and edit text.

You can set the Text in the control, or AppendText() . You can also find the TextLength . You can Select() text, or manipulate the SelectionStart and SelectionLength . A SelectedText property allows you to retrieve the current selection. If the SelectionLength is 0, the SelectionStart represents the current position of the caret. You can ensure that the caret is visible using ScrollToCaret( ) . SelectAll() will select the entire content, and Clear() will remove it.

You can Cut( ) or Copy() the selection to the clipboard, and Paste() an IDataObject from the clipboard or a drag-and-drop operation.

The textbox is single line by default, but you can enable Multiline support (and find the number of Lines in the control). If you have a multiline control, you can enable WordWrap .

There is basic Undo() support. You can find out if the control CanUndo the previous operation, and you can use ClearUndo() to clear the undo buffer.

 public abstract class  TextBoxBase  : Control {  // Public Instance Properties  public bool  AcceptsTab  {set; get; }    public virtual bool  AutoSize  {set; get; }    public override Color  BackColor  {set; get; }  // overrides Control  public override Image  BackgroundImage  {set; get; }  // overrides Control  public BorderStyle  BorderStyle  {set; get; }    public bool  CanUndo  {get; }    public override Color  ForeColor  {set; get; }  // overrides Control  public bool  HideSelection  {set; get; }    public string[ ]  Lines  {set; get; }    public virtual int  MaxLength  {set; get; }    public bool  Modified  {set; get; }    public virtual bool  Multiline  {set; get; }    public int  PreferredHeight  {get; }    public bool  ReadOnly  {set; get; }    public virtual string  SelectedText  {set; get; }    public virtual int  SelectionLength  {set; get; }    public int  SelectionStart  {set; get; }    public override string  Text  {set; get; }  // overrides Control  public virtual int  TextLength  {get; }    public bool  WordWrap  {set; get; }  // Protected Instance Properties  protected override CreateParams  CreateParams  {get; }  // overrides Control  protected override Size  DefaultSize  {get; }  // overrides Control   // Public Instance Methods  public void  AppendText  (string  text  );    public void  Clear  ();    public void  ClearUndo  ();    public void  Copy  ();    public void  Cut  ();    public void  Paste  ();    public void  ScrollToCaret  ();    public void  Select  (int  start  , int  length  );    public void  SelectAll  ();    public override string  ToString  ();  // overrides System.ComponentModel.Component  public void  Undo  ();  // Protected Instance Methods  protected override void  CreateHandle  ();  // overrides Control  protected override bool  IsInputKey  (Keys  keyData  );  // overrides Control  protected virtual void  OnAcceptsTabChanged  (EventArgs  e  );    protected virtual void  OnAutoSizeChanged  (EventArgs  e  );    protected virtual void  OnBorderStyleChanged  (EventArgs  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  OnHideSelectionChanged  (EventArgs  e  );    protected virtual void  OnModifiedChanged  (EventArgs  e  );    protected virtual void  OnMultilineChanged  (EventArgs  e  );    protected virtual void  OnReadOnlyChanged  (EventArgs  e  );    protected override bool  ProcessDialogKey  (Keys  keyData  );  // overrides Control  protected override void  SetBoundsCore  (int  x  , int  y  , int  width  , int  height  , BoundsSpecified  specified  );  // overrides Control  protected override void  WndProc  (ref Message  m  );  // overrides Control   // Events  public event EventHandler  AcceptsTabChanged  ;    public event EventHandler  AutoSizeChanged  ;    public event EventHandler  BorderStyleChanged  ;    public event EventHandler  Click  ;  // overrides Control  public event EventHandler  HideSelectionChanged  ;    public event EventHandler  ModifiedChanged  ;    public event EventHandler  MultilineChanged  ;    public event PaintEventHandler  Paint  ;  // overrides Control  public event EventHandler  ReadOnlyChanged  ; } 

Hierarchy

System.Object System.MarshalByRefObject System.ComponentModel.Component(System.ComponentModel.IComponen, System.IDisposable) Control(IOleContro, IOleObject , IOleInPlaceObject , IOleInPlaceActiveObject , IOleWindow , IViewObject , IViewObject2 , IPersist , IPersistStreamInit , IPersistPropertyBag , IPersistStorage , IQuickActivate , System.ComponentModel.ISynchronizeInvoke , IWin32Window) TextBoxBase

Subclasses

RichTextBox , TextBox