2 // System.Web.UI.DataBinder.cs
5 // Duncan Mak (duncan@ximian.com)
6 // Gonzalo Paniagua Javier (gonzalo@ximian.com)
8 // (C) 2002 Ximian, Inc. (http://www.ximian.com)
9 // Copyright (C) 2005 Novell, Inc (http://www.novell.com)
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:
19 // The above copyright notice and this permission notice shall be
20 // included in all copies or substantial portions of the Software.
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.
31 using System.Collections;
32 using System.ComponentModel;
33 using System.Reflection;
34 using System.Security.Permissions;
36 using System.Collections.Generic;
39 namespace System.Web.UI {
41 // CAS - no InheritanceDemand here as the class is sealed
42 [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
43 public sealed class DataBinder {
48 internal static string FormatResult (object result, string format)
53 if (format == null || format.Length == 0)
54 return result.ToString ();
56 return String.Format (format, result);
59 public static object Eval (object container, string expression)
61 if ((expression == null) || (expression.Length == 0))
62 throw new ArgumentNullException ("expression");
64 object current = container;
66 while (current != null) {
67 int dot = expression.IndexOf ('.');
68 int size = (dot == -1) ? expression.Length : dot;
69 string prop = expression.Substring (0, size);
70 if (prop.IndexOf ('[') != -1)
71 current = GetIndexedPropertyValue (current, prop);
73 current = GetPropertyValue (current, prop);
78 expression = expression.Substring (prop.Length + 1);
84 public static string Eval (object container, string expression, string format)
86 object result = Eval (container, expression);
87 return FormatResult (result, format);
90 public static object GetIndexedPropertyValue (object container, string expr)
92 if (container == null)
93 throw new ArgumentNullException ("container");
94 if ((expr == null) || (expr.Length == 0))
95 throw new ArgumentNullException ("expr");
97 int openIdx = expr.IndexOf ('[');
98 int closeIdx = expr.IndexOf (']'); // see the test case. MS ignores all after the first ]
99 if (openIdx < 0 || closeIdx < 0 || closeIdx - openIdx <= 1)
100 throw new ArgumentException (expr + " is not a valid indexed expression.");
102 string val = expr.Substring (openIdx + 1, closeIdx - openIdx - 1);
105 throw new ArgumentException (expr + " is not a valid indexed expression.");
107 bool is_string = false;
108 // a quoted val means we have a string
109 if ((val[0] == '\'' && val[val.Length - 1] == '\'') ||
110 (val[0] == '\"' && val[val.Length - 1] == '\"')) {
112 val = val.Substring(1, val.Length - 2);
114 // if all chars are digits, then we have a int
115 for(int i = 0; i < val.Length; i++)
116 if (!Char.IsDigit(val[i])) {
125 intVal = Int32.Parse (val);
127 throw new ArgumentException (expr + " is not a valid indexed expression.");
131 string property = null;
133 property = expr.Substring (0, openIdx);
134 if (property != null && property != String.Empty)
135 container = GetPropertyValue (container, property);
138 if (container == null)
141 if (container is System.Collections.IList) {
142 IList l = (IList) container;
146 Type t = container.GetType ();
147 // MS does not seem to look for any other than "Item"!!!
148 object [] atts = t.GetCustomAttributes (typeof (DefaultMemberAttribute), false);
149 if (atts.Length != 1)
150 throw new ArgumentException (expr + " indexer not found.");
152 property = ((DefaultMemberAttribute) atts [0]).MemberName;
154 Type [] argTypes = new Type [] { (is_string) ? typeof (string) : typeof (int) };
155 PropertyInfo prop = t.GetProperty (property, argTypes);
157 throw new ArgumentException (expr + " indexer not found.");
159 object [] args = new object [1];
165 return prop.GetValue (container, args);
168 public static string GetIndexedPropertyValue (object container, string expr, string format)
170 object result = GetIndexedPropertyValue (container, expr);
171 return FormatResult (result, format);
174 public static object GetPropertyValue (object container, string propName)
176 if (container == null)
177 throw new ArgumentNullException ("container");
178 if (propName == null)
179 throw new ArgumentNullException ("propName");
181 PropertyDescriptor prop = TypeDescriptor.GetProperties (container).Find (propName, true);
183 throw new HttpException ("Property " + propName + " not found in " +
184 container.GetType ());
187 return prop.GetValue (container);
190 public static string GetPropertyValue (object container, string propName, string format)
192 object result = GetPropertyValue (container, propName);
193 return FormatResult (result, format);
198 static Dictionary<Type, PropertyInfo> dataItemCache;
200 public static object GetDataItem (object container, out bool foundDataItem)
202 foundDataItem = false;
203 if (container == null)
206 if (container is IDataItemContainer) {
207 foundDataItem = true;
208 return ((IDataItemContainer)container).DataItem;
211 PropertyInfo pi = null;
212 if (dataItemCache == null)
213 dataItemCache = new Dictionary<Type, PropertyInfo> ();
215 Type type = container.GetType ();
216 if (!dataItemCache.TryGetValue (type, out pi)) {
217 pi = type.GetProperty ("DataItem", BindingFlags.Public | BindingFlags.Instance);
218 dataItemCache [type] = pi;
224 foundDataItem = true;
225 return pi.GetValue (container, null);
229 public static object GetDataItem (object container)
232 return GetDataItem (container, out flag);