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