TextBox 控件源码|TextBox 服务器控件源码|TextBox 控件c#源码

[ControlBuilder(typeof(TextBoxControlBuilder)), DefaultProperty("Text"), ParseChildren(false), DataBindingHandler("System.Web.UI.Design.TextDataBindingHandler, System.Design, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"), ValidationProperty("Text"), DefaultEvent("TextChanged"), PermissionSet(SecurityAction.LinkDemand, XML="<PermissionSet class=\"System.Security.PermissionSet\"\r\n version=\"1\">\r\n <IPermission class=\"System.Web.AspNetHostingPermission, System, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089\"\r\n version=\"1\"\r\n Level=\"Minimal\"/>\r\n</PermissionSet>\r\n"), PermissionSet(SecurityAction.InheritanceDemand, XML="<PermissionSet class=\"System.Security.PermissionSet\"\r\n version=\"1\">\r\n <IPermission class=\"System.Web.AspNetHostingPermission, System, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089\"\r\n version=\"1\"\r\n Level=\"Minimal\"/>\r\n</PermissionSet>\r\n")]public class TextBox : WebControl, IPostBackDataHandler
{
  // Fields
  private static readonly object EventTextChanged;

  // Events
  [WebCategory("Action"), WebSysDescription("TextBox_OnTextChanged")]
  public event EventHandler TextChanged;

  // Methods
  static TextBox();
  public TextBox();
  protected override void AddAttributesToRender(HtmlTextWriter writer);
  protected override void AddParsedSubObject(object obj);
  protected override void OnPreRender(EventArgs e);
  protected virtual void OnTextChanged(EventArgs e);
  protected override void Render(HtmlTextWriter writer);
  bool IPostBackDataHandler.LoadPostData(string postDataKey, NameValueCollection postCollection);
  void IPostBackDataHandler.RaisePostDataChangedEvent();

  // Properties
  [WebCategory("Behavior"), WebSysDescription("TextBox_AutoPostBack"), DefaultValue(false)]
  public virtual bool AutoPostBack { get; set; }
  [DefaultValue(0), WebSysDescription("TextBox_Columns"), Bindable(true), WebCategory("Appearance")]
  public virtual int Columns { get; set; }
  [Bindable(true), WebCategory("Behavior"), DefaultValue(0), WebSysDescription("TextBox_MaxLength")]
  public virtual int MaxLength { get; set; }
  [WebCategory("Behavior"), Bindable(true), DefaultValue(false), WebSysDescription("TextBox_ReadOnly")]
  public virtual bool ReadOnly { get; set; }
  [Bindable(true), WebCategory("Behavior"), DefaultValue(0), WebSysDescription("TextBox_Rows")]
  public virtual int Rows { get; set; }
  private bool SaveTextViewState { get; }
  protected override HtmlTextWriterTag TagKey { get; }
  [Bindable(true), WebCategory("Appearance"), DefaultValue(""), WebSysDescription("TextBox_Text"), PersistenceMode(PersistenceMode.EncodedInnerDefaultProperty)]
  public virtual string Text { get; set; }
  [DefaultValue(0), WebSysDescription("TextBox_TextMode"), WebCategory("Behavior")]
  public virtual TextBoxMode TextMode { get; set; }
  [WebCategory("Layout"), DefaultValue(true), WebSysDescription("TextBox_Wrap")]
  public virtual bool Wrap { get; set; }
}
[ControlBuilder(typeof(TextBoxControlBuilder)), DefaultProperty("Text"), ParseChildren(false), DataBindingHandler("System.Web.UI.Design.TextDataBindingHandler, System.Design, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"), ValidationProperty("Text"), DefaultEvent("TextChanged"), PermissionSet(SecurityAction.LinkDemand, XML="<PermissionSet class=\"System.Security.PermissionSet\"\r\n version=\"1\">\r\n <IPermission class=\"System.Web.AspNetHostingPermission, System, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089\"\r\n version=\"1\"\r\n Level=\"Minimal\"/>\r\n</PermissionSet>\r\n"), PermissionSet(SecurityAction.InheritanceDemand, XML="<PermissionSet class=\"System.Security.PermissionSet\"\r\n version=\"1\">\r\n <IPermission class=\"System.Web.AspNetHostingPermission, System, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089\"\r\n version=\"1\"\r\n Level=\"Minimal\"/>\r\n</PermissionSet>\r\n")]
public class TextBox : WebControl, IPostBackDataHandler
{
  // Fields
  private static readonly object EventTextChanged = new object();

  // Events
  [WebCategory("Action"), WebSysDescription("TextBox_OnTextChanged")]
  public event EventHandler TextChanged
  {
  add
  {
  base.Events.AddHandler(EventTextChanged, value);
  }
  remove
  {
  base.Events.RemoveHandler(EventTextChanged, value);
  }
  }

  // Methods
  public TextBox() : base(HtmlTextWriterTag.Input)
  {
  }

  protected override void AddAttributesToRender(HtmlTextWriter writer)
  {
  int maxLength;
  if (this.Page != null)
  {
  this.Page.VerifyRenderingInServerForm(this);
  }
  writer.AddAttribute(HtmlTextWriterAttribute.Name, this.UniqueID);
  switch (this.TextMode)
  {
  case TextBoxMode.SingleLine:
  {
  writer.AddAttribute(HtmlTextWriterAttribute.Type, "text");
  string text = this.Text;
  if (text.Length > 0)
  {
  writer.AddAttribute(HtmlTextWriterAttribute.Value, text);
  }
  break;
  }
  case TextBoxMode.Password:
  writer.AddAttribute(HtmlTextWriterAttribute.Type, "password");
  break;

  case TextBoxMode.MultiLine:
  maxLength = this.Rows;
  if (maxLength > 0)
  {
  writer.AddAttribute(HtmlTextWriterAttribute.Rows, maxLength.ToString(NumberFormatInfo.InvariantInfo));
  }
  maxLength = this.Columns;
  if (maxLength > 0)
  {
  writer.AddAttribute(HtmlTextWriterAttribute.Cols, maxLength.ToString(NumberFormatInfo.InvariantInfo));
  }
  if (!this.Wrap)
  {
  writer.AddAttribute(HtmlTextWriterAttribute.Wrap, "off");
  }
  goto Label_00FF;
  }
  maxLength = this.MaxLength;
  if (maxLength > 0)
  {
  writer.AddAttribute(HtmlTextWriterAttribute.Maxlength, maxLength.ToString(NumberFormatInfo.InvariantInfo));
  }
  maxLength = this.Columns;
  if (maxLength > 0)
  {
  writer.AddAttribute(HtmlTextWriterAttribute.Size, maxLength.ToString(NumberFormatInfo.InvariantInfo));
  }
  Label_00FF:
  if (this.ReadOnly)
  {
  writer.AddAttribute(HtmlTextWriterAttribute.ReadOnly, "readonly");
  }
  if (this.AutoPostBack && (this.Page != null))
  {
  string postBackClientEvent = this.Page.GetPostBackClientEvent(this, "");
  if (base.HasAttributes)
  {
  string str3 = base.Attributes["onchange"];
  if (str3 != null)
  {
  postBackClientEvent = str3 + postBackClientEvent;
  base.Attributes.Remove("onchange");
  }
  }
  writer.AddAttribute(HtmlTextWriterAttribute.Onchange, postBackClientEvent);
  writer.AddAttribute("language", "javascript");
  }
  base.AddAttributesToRender(writer);
  }

  protected override void AddParsedSubObject(object obj)
  {
  if (!(obj is LiteralControl))
  {
  throw new HttpException(HttpRuntime.FormatResourceString("Cannot_Have_Children_Of_Type", "TextBox", obj.GetType().Name.ToString()));
  }
  this.Text = ((LiteralControl) obj).Text;
  }

  protected override void OnPreRender(EventArgs e)
  {
  base.OnPreRender(e);
  if (!this.SaveTextViewState)
  {
  this.ViewState.SetItemDirty("Text", false);
  }
  if (((this.Page != null) && this.AutoPostBack) && this.Enabled)
  {
  this.Page.RegisterPostBackScript();
  }
  }

  protected virtual void OnTextChanged(EventArgs e)
  {
  EventHandler handler = (EventHandler) base.Events[EventTextChanged];
  if (handler != null)
  {
  handler(this, e);
  }
  }

  protected override void Render(HtmlTextWriter writer)
  {
  this.RenderBeginTag(writer);
  if (this.TextMode == TextBoxMode.MultiLine)
  {
  HttpUtility.HtmlEncode(this.Text, writer);
  }
  this.RenderEndTag(writer);
  }

  bool IPostBackDataHandler.LoadPostData(string postDataKey, NameValueCollection postCollection)
  {
  string text = this.Text;
  string str2 = postCollection[postDataKey];
  if (!text.Equals(str2))
  {
  this.Text = str2;
  return true;
  }
  return false;
  }

  void IPostBackDataHandler.RaisePostDataChangedEvent()
  {
  this.OnTextChanged(EventArgs.Empty);
  }

  // Properties
  [WebCategory("Behavior"), WebSysDescription("TextBox_AutoPostBack"), DefaultValue(false)]
  public virtual bool AutoPostBack
  {
  get
  {
  object obj2 = this.ViewState["AutoPostBack"];
  return ((obj2 != null) && ((bool) obj2));
  }
  set
  {
  this.ViewState["AutoPostBack"] = value;
  }
  }

  [DefaultValue(0), WebSysDescription("TextBox_Columns"), Bindable(true), WebCategory("Appearance")]
  public virtual int Columns
  {
  get
  {
  object obj2 = this.ViewState["Columns"];
  if (obj2 != null)
  {
  return (int) obj2;
  }
  return 0;
  }
  set
  {
  if (value < 0)
  {
  throw new ArgumentOutOfRangeException("value");
  }
  this.ViewState["Columns"] = value;
  }
  }

  [Bindable(true), WebCategory("Behavior"), DefaultValue(0), WebSysDescription("TextBox_MaxLength")]
  public virtual int MaxLength
  {
  get
  {
  object obj2 = this.ViewState["MaxLength"];
  if (obj2 != null)
  {
  return (int) obj2;
  }
  return 0;
  }
  set
  {
  if (value < 0)
  {
  throw new ArgumentOutOfRangeException("value");
  }
  this.ViewState["MaxLength"] = value;
  }
  }

  [WebCategory("Behavior"), Bindable(true), DefaultValue(false), WebSysDescription("TextBox_ReadOnly")]
  public virtual bool ReadOnly
  {
  get
  {
  object obj2 = this.ViewState["ReadOnly"];
  return ((obj2 != null) && ((bool) obj2));
  }
  set
  {
  this.ViewState["ReadOnly"] = value;
  }
  }

  [Bindable(true), WebCategory("Behavior"), DefaultValue(0), WebSysDescription("TextBox_Rows")]
  public virtual int Rows
  {
  get
  {
  object obj2 = this.ViewState["Rows"];
  if (obj2 != null)
  {
  return (int) obj2;
  }
  return 0;
  }
  set
  {
  if (value < 0)
  {
  throw new ArgumentOutOfRangeException("value");
  }
  this.ViewState["Rows"] = value;
  }
  }

  private bool SaveTextViewState
  {
  get
  {
  if (this.TextMode == TextBoxMode.Password)
  {
  return false;
  }
  if (((base.Events[EventTextChanged] == null) && this.Enabled) && (this.Visible && (base.GetType() == typeof(TextBox))))
  {
  return false;
  }
  return true;
  }
  }

  protected override HtmlTextWriterTag TagKey
  {
  get
  {
  if (this.TextMode == TextBoxMode.MultiLine)
  {
  return HtmlTextWriterTag.Textarea;
  }
  return HtmlTextWriterTag.Input;
  }
  }

  [Bindable(true), WebCategory("Appearance"), DefaultValue(""), WebSysDescription("TextBox_Text"), PersistenceMode(PersistenceMode.EncodedInnerDefaultProperty)]
  public virtual string Text
  {
  get
  {
  string str = (string) this.ViewState["Text"];
  if (str != null)
  {
  return str;
  }
  return string.Empty;
  }
  set
  {
  this.ViewState["Text"] = value;
  }
  }

  [DefaultValue(0), WebSysDescription("TextBox_TextMode"), WebCategory("Behavior")]
  public virtual TextBoxMode TextMode
  {
  get
  {
  object obj2 = this.ViewState["Mode"];
  if (obj2 != null)
  {
  return (TextBoxMode) obj2;
  }
  return TextBoxMode.SingleLine;
  }
  set
  {
  if ((value < TextBoxMode.SingleLine) || (value > TextBoxMode.Password))
  {
  throw new ArgumentOutOfRangeException("value");
  }
  this.ViewState["Mode"] = value;
  }
  }

  [WebCategory("Layout"), DefaultValue(true), WebSysDescription("TextBox_Wrap")]
  public virtual bool Wrap
  {
  get
  {
  object obj2 = this.ViewState["Wrap"];
  if (obj2 != null)
  {
  return (bool) obj2;
  }
  return true;
  }
  set
  {
  this.ViewState["Wrap"] = value;
  }
  }
}