mcs/class/System.Web/System.Web.UI.WebControls/FileUpload.cs

   1 //
   2 // (C) 2005 Mainsoft Corporation (http://www.mainsoft.com)
   3 //
   4 // Authors:
   5 //      Andrew Skiba <andrews@mainsoft.com>
   6 //
   7 // Permission is hereby granted, free of charge, to any person obtaining
   8 // a copy of this software and associated documentation files (the
   9 // "Software"), to deal in the Software without restriction, including
  10 // without limitation the rights to use, copy, modify, merge, publish,
  11 // distribute, sublicense, and/or sell copies of the Software, and to
  12 // permit persons to whom the Software is furnished to do so, subject to
  13 // the following conditions:
  14 //
  15 // The above copyright notice and this permission notice shall be
  16 // included in all copies or substantial portions of the Software.
  17 //
  18 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  21 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  22 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25 //
  26 using System;
  27 using System.ComponentModel;
  28 using System.Web;
  29 using System.Web.UI;
  30 using System.Web.UI.HtmlControls;
  31 using System.Security.Permissions;
  32 using System.IO;
  33
  34 namespace System.Web.UI.WebControls
  35 {
  36         [ControlValueProperty ("FileBytes")]
  37         [ValidationProperty ("FileName")]
  38         [Designer ("DesignerBaseTypeNameSystem.ComponentModel.Design.IDesignerDesignerTypeNameSystem.Web.UI.Design.WebControls.PreviewControlDesigner, " + Consts.AssemblySystem_Design)]
  39         [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal, Unrestricted=false)]
  40         [AspNetHostingPermissionAttribute(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal, Unrestricted=false)]
  41         public class FileUpload : WebControl
  42         {
  43                 public FileUpload ()
  44                         : base (HtmlTextWriterTag.Input)
  45                 {
  46                 }
  47
  48                 byte[] cachedBytes;
  49                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
  50                 [Bindable (true, BindingDirection.OneWay)]
  51                 [Browsable (false)]
  52                 public byte[] FileBytes {
  53                         get {
  54                                 if (cachedBytes == null) {
  55                                         cachedBytes = new byte[FileContent.Length];
  56                                         FileContent.Read (cachedBytes, 0, cachedBytes.Length);
  57                                 }
  58                                 return (byte [])(cachedBytes.Clone ());
  59                         }
  60                 }
  61
  62                 [Browsable(false)]
  63                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
  64                 public Stream FileContent {
  65                         get {
  66                                 if (PostedFile == null)
  67                                         return Stream.Null;
  68                                 else {
  69                                         Stream ret = PostedFile.InputStream;
  70                                         if (ret != null)
  71                                                 ret.Position = 0;
  72
  73                                         return ret;
  74                                 }
  75                         }
  76                 }
  77
  78                 [Browsable (false)]
  79                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
  80                 public string FileName {
  81                         get {
  82                                 if (PostedFile == null)
  83                                         return String.Empty;
  84                                 else
  85                                         return Path.GetFileName (PostedFile.FileName);
  86                         }
  87                 }
  88
  89                 [Browsable (false)]
  90                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
  91                 public bool HasFile {
  92                         get {
  93                                 HttpPostedFile pf = PostedFile;
  94                                 return (pf != null && !String.IsNullOrEmpty (pf.FileName));
  95                         }
  96                 }
  97
  98                 [Browsable (false)]
  99                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 100                 public HttpPostedFile PostedFile {
 101                         get {
 102                                 Page page = Page;
 103                                 if (page == null || !page.IsPostBack)
 104                                         return null;
 105                                 if (Context == null || Context.Request == null)
 106                                         return null;
 107                                 return Context.Request.Files[UniqueID];
 108                         }
 109                 }
 110
 111                 protected override void AddAttributesToRender (HtmlTextWriter writer)
 112                 {
 113                         writer.AddAttribute (HtmlTextWriterAttribute.Type, "file", false);
 114                         if (!string.IsNullOrEmpty (UniqueID))
 115                                 writer.AddAttribute (HtmlTextWriterAttribute.Name, UniqueID);
 116                         base.AddAttributesToRender (writer);
 117                 }
 118
 119                 protected internal override void OnPreRender (System.EventArgs e)
 120                 {
 121                         base.OnPreRender (e);
 122                         Page page = Page;
 123                         if (page != null)
 124                                 page.Form.Enctype = "multipart/form-data";
 125                 }
 126
 127                 protected internal override void Render (HtmlTextWriter writer)
 128                 {
 129                         Page page = Page;
 130                         if (page != null)
 131                                 page.VerifyRenderingInServerForm (this);
 132                         base.Render (writer);
 133                 }
 134
 135                 public void SaveAs (string filename)
 136                 {
 137                         HttpPostedFile file = PostedFile;
 138                         if (file != null)
 139                                 file.SaveAs (filename);
 140                 }
 141         }
 142 }
 143