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

   1 //
   2 // System.Web.UI.WebControls.BoundField.cs
   3 //
   4 // Authors:
   5 //      Lluis Sanchez Gual (lluis@novell.com)
   6 //
   7 // (C) 2005 Novell, Inc (http://www.novell.com)
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 #if NET_2_0
  32 using System.Collections;
  33 using System.Collections.Specialized;
  34 using System.Web.UI;
  35 using System.ComponentModel;
  36 using System.Security.Permissions;
  37 using System.Reflection;
  38
  39 namespace System.Web.UI.WebControls {
  40
  41         [AspNetHostingPermissionAttribute (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  42         [AspNetHostingPermissionAttribute (SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  43         public class BoundField : DataControlField
  44         {
  45                 public static readonly string ThisExpression = "!";
  46
  47                 PropertyDescriptor boundProperty;
  48
  49                 [DefaultValueAttribute (true)]
  50                 [WebCategoryAttribute ("Behavior")]
  51                 public virtual bool ConvertEmptyStringToNull {
  52                         get {
  53                                 object ob = ViewState ["ConvertEmptyStringToNull"];
  54                                 if (ob != null) return (bool) ob;
  55                                 return true;
  56                         }
  57                         set {
  58                                 ViewState ["ConvertEmptyStringToNull"] = value;
  59                                 OnFieldChanged ();
  60                         }
  61                 }
  62
  63                 [TypeConverterAttribute ("System.Web.UI.Design.DataSourceViewSchemaConverter, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]
  64                 [WebCategoryAttribute ("Data")]
  65                 [DefaultValueAttribute ("")]
  66                 public virtual string DataField {
  67                         get {
  68                                 object ob = ViewState ["DataField"];
  69                                 if (ob != null) return (string) ob;
  70                                 return "";
  71                         }
  72                         set {
  73                                 ViewState ["DataField"] = value;
  74                                 OnFieldChanged ();
  75                         }
  76                 }
  77
  78                 [DefaultValueAttribute ("")]
  79                 [WebCategoryAttribute ("Data")]
  80                 public virtual string DataFormatString {
  81                         get {
  82                                 object ob = ViewState ["DataFormatString"];
  83                                 if (ob != null) return (string) ob;
  84                                 return "";
  85                         }
  86                         set {
  87                                 ViewState ["DataFormatString"] = value;
  88                                 OnFieldChanged ();
  89                         }
  90                 }
  91
  92                 [DefaultValueAttribute ("")]
  93                 [WebCategoryAttribute ("Behavior")]
  94                 public virtual string NullDisplayText {
  95                         get {
  96                                 object ob = ViewState ["NullDisplayText"];
  97                                 if (ob != null) return (string) ob;
  98                                 return "";
  99                         }
 100                         set {
 101                                 ViewState ["NullDisplayText"] = value;
 102                                 OnFieldChanged ();
 103                         }
 104                 }
 105
 106                 [WebCategoryAttribute ("Behavior")]
 107                 [DefaultValueAttribute (false)]
 108                 public bool ReadOnly {
 109                         get {
 110                                 object val = ViewState ["ReadOnly"];
 111                                 return val != null ? (bool) val : false;
 112                         }
 113                         set {
 114                                 ViewState ["ReadOnly"] = value;
 115                                 OnFieldChanged ();
 116                         }
 117                 }
 118
 119                 [WebCategoryAttribute ("HtmlEncode")]
 120                 [DefaultValueAttribute (true)]
 121                 public virtual bool HtmlEncode {
 122                         get {
 123                                 object val = ViewState ["HtmlEncode"];
 124                                 return val != null ? (bool) val : true;
 125                         }
 126                         set {
 127                                 ViewState ["HtmlEncode"] = true;
 128                                 OnFieldChanged ();
 129                         }
 130                 }
 131
 132                 public override void ExtractValuesFromCell (IOrderedDictionary dictionary,
 133                         DataControlFieldCell cell, DataControlRowState rowState, bool includeReadOnly)
 134                 {
 135                         if ((rowState & DataControlRowState.Edit) != 0 && !ReadOnly) {
 136                                 if (cell.Controls.Count > 0) {
 137                                         TextBox box = (TextBox) cell.Controls [0];
 138                                         dictionary [DataField] = box.Text;
 139                                 }
 140                         } else if (includeReadOnly) {
 141                                 dictionary [DataField] = cell.Text;
 142                         }
 143                 }
 144
 145                 public override void InitializeCell (DataControlFieldCell cell,
 146                         DataControlCellType cellType, DataControlRowState rowState, int rowIndex)
 147                 {
 148                         base.InitializeCell (cell, cellType, rowState, rowIndex);
 149                         if (cellType == DataControlCellType.DataCell) {
 150                                 InitializeDataCell (cell, rowState);
 151                                 cell.DataBinding += new EventHandler (OnDataBindField);
 152                         }
 153                 }
 154
 155                 public virtual void InitializeDataCell (DataControlFieldCell cell, DataControlRowState rowState)
 156                 {
 157                         if ((rowState & DataControlRowState.Edit) != 0 && !ReadOnly) {
 158                                 TextBox box = new TextBox ();
 159                                 cell.Controls.Add (box);
 160                         }
 161                 }
 162
 163                 protected virtual bool SupportsHtmlEncode {
 164                         get { return true; }
 165                 }
 166
 167                 protected virtual string FormatDataValue (object value, bool encode)
 168                 {
 169                         string res;
 170                         if (value == null || (value.ToString().Length == 0 && ConvertEmptyStringToNull))
 171                                 res = NullDisplayText;
 172                         else if (DataFormatString.Length > 0)
 173                                 res = string.Format (DataFormatString, value);
 174                         else
 175                                 res = value.ToString ();
 176
 177                         if (encode) return HttpUtility.HtmlEncode (res);
 178                         else return res;
 179                 }
 180
 181                 protected virtual object GetValue (Control controlContainer)
 182                 {
 183                         if (DesignMode)
 184                                 return GetDesignTimeValue ();
 185                         else
 186                                 return GetBoundValue (controlContainer);
 187                 }
 188
 189                 protected virtual object GetDesignTimeValue ()
 190                 {
 191                         return GetBoundValue (Control);
 192                 }
 193
 194                 object GetBoundValue (Control controlContainer)
 195                 {
 196                         if (DataField == ThisExpression)
 197                                 return controlContainer.ToString ();
 198                         else {
 199                                 IDataItemContainer dic = (IDataItemContainer) controlContainer;
 200                                 if (boundProperty == null) {
 201                                         boundProperty = TypeDescriptor.GetProperties (dic.DataItem) [DataField];
 202                                         if (boundProperty == null)
 203                                                 new InvalidOperationException ("Property '" + DataField + "' not found in object of type " + dic.DataItem.GetType());
 204                                 }
 205                                 return boundProperty.GetValue (dic.DataItem);
 206                         }
 207                 }
 208
 209                 protected virtual void OnDataBindField (object sender, EventArgs e)
 210                 {
 211                         DataControlFieldCell cell = (DataControlFieldCell) sender;
 212                         if (cell.Controls.Count > 0) {
 213                                 TextBox box = (TextBox) cell.Controls [0];
 214                                 object val = GetValue (cell.BindingContainer);
 215                                 box.Text = val != null ? val.ToString() : "";
 216                         }
 217                         else
 218                                 cell.Text = FormatDataValue (GetValue (cell.BindingContainer), SupportsHtmlEncode && HtmlEncode);
 219                 }
 220         }
 221 }
 222 #endif