HtmlInputFile.cs :  » 2.6.4-mono-.net-core » System.Web » System » Web » UI » HtmlControls » C# / CSharp Open Source

//
// System.Web.UI.HtmlControls.HtmlInputFile.cs
//
// Author:
//  Dick Porter  <dick@ximian.com>
//
// Copyright (C) 2005-2010 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System.Collections.Specialized;
using System.ComponentModel;
using System.Security.Permissions;

namespace System.Web.UI.HtmlControls{
  // CAS
  [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  [AspNetHostingPermission (SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  // attributes
  [ValidationProperty ("Value")]
  public class HtmlInputFile : HtmlInputControl , IPostBackDataHandler
  {
    HttpPostedFile posted_file;

    public HtmlInputFile () : base ("file")
    {
    }

    [DefaultValue ("")]
    [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
    [WebSysDescription("")]
    public string Accept {
      get {
        string acc = Attributes["accept"];

        if (acc == null) {
          return (String.Empty);
        }

        return (acc);
      }
      set {
        if (value == null) {
          Attributes.Remove ("accept");
        } else {
          Attributes["accept"] = value;
        }
      }
    }

    [DefaultValue ("")]
    [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
    [WebSysDescription("")]
    public int MaxLength {
      get {
        string maxlen = Attributes["maxlength"];
        
        if (maxlen == null) {
          return (-1);
        } else {
          return (Convert.ToInt32 (maxlen));
        }
      }
      set {
        if (value == -1) {
          Attributes.Remove ("maxlength");
        } else {
          Attributes["maxlength"] = value.ToString ();
        }
      }
    }
    
    [DefaultValue ("")]
    [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
    [WebSysDescription("")]
    [WebCategory("Misc")]
    public HttpPostedFile PostedFile {
      get {
        return (posted_file);
      }
    }
    
    [DefaultValue ("-1")]
    [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
    [WebSysDescription("")]
    [WebCategory("Appearance")]
    public int Size {
      get {
        string size = Attributes["size"];
        
        if (size == null) {
          return (-1);
        } else {
          return (Convert.ToInt32 (size));
        }
      }
      set {
        if (value == -1) {
          Attributes.Remove ("size");
        } else {
          Attributes["size"] = value.ToString ();
        }
      }
    }
    
    [Browsable (false)]
    public override string Value {
      get {
        HttpPostedFile file = PostedFile;
        if (file == null)
          return string.Empty;

        return file.FileName;
      }
      set {
        throw new NotSupportedException ("The value property on HtmlInputFile is not settable.");
      }
    }

    protected internal override void OnPreRender (EventArgs e)
    {
      base.OnPreRender (e);

      Page page = Page;
      if (page != null && !Disabled) {
        page.RegisterRequiresPostBack (this);
        page.RegisterEnabledControl (this);
      }
      
      HtmlForm form = (HtmlForm) SearchParentByType (typeof (HtmlForm));
      if (form != null && form.Enctype == String.Empty)
        form.Enctype = "multipart/form-data";
    }

    Control SearchParentByType (Type type)
    {
      Control ctrl = Parent;
      while (ctrl != null) {
        if (type.IsAssignableFrom (ctrl.GetType ())) {
          return ctrl;
        }
        ctrl = ctrl.Parent;
      }

      return null;
    }

    bool LoadPostDataInternal (string postDataKey, NameValueCollection postCollection)
    {
      Page page = Page;
      if (page != null)
        posted_file = page.Request.Files [postDataKey];
      
      return (false);
    }

    void RaisePostDataChangedEventInternal ()
    {
      /* No events to raise */
    }

    protected virtual bool LoadPostData (string postDataKey, NameValueCollection postCollection)
    {
      return LoadPostDataInternal (postDataKey, postCollection);
    }

    protected virtual void RaisePostDataChangedEvent ()
    {
      RaisePostDataChangedEventInternal ();
    }
    
    bool IPostBackDataHandler.LoadPostData (string postDataKey, NameValueCollection postCollection)
    {
      return LoadPostData (postDataKey, postCollection);
    }

    void IPostBackDataHandler.RaisePostDataChangedEvent ()
    {
      RaisePostDataChangedEvent ();
    }
  }
}