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 expression = expression != null ? expression.Trim () : null;
62 if (expression == null || expression.Length == 0)
63 throw new ArgumentNullException ("expression");
65 object current = container;
67 while (current != null) {
68 int dot = expression.IndexOf ('.');
69 int size = (dot == -1) ? expression.Length : dot;
70 string prop = expression.Substring (0, size);
71 if (prop.IndexOf ('[') != -1)
72 current = GetIndexedPropertyValue (current, prop);
74 current = GetPropertyValue (current, prop);
79 expression = expression.Substring (prop.Length + 1);
85 public static string Eval (object container, string expression, string format)
87 object result = Eval (container, expression);
88 return FormatResult (result, format);
91 public static object GetIndexedPropertyValue (object container, string expr)
93 if (container == null)
94 throw new ArgumentNullException ("container");
95 if ((expr == null) || (expr.Length == 0))
96 throw new ArgumentNullException ("expr");
98 int openIdx = expr.IndexOf ('[');
99 int closeIdx = expr.IndexOf (']'); // see the test case. MS ignores all after the first ]
100 if (openIdx < 0 || closeIdx < 0 || closeIdx - openIdx <= 1)
101 throw new ArgumentException (expr + " is not a valid indexed expression.");
103 string val = expr.Substring (openIdx + 1, closeIdx - openIdx - 1);
106 throw new ArgumentException (expr + " is not a valid indexed expression.");
108 bool is_string = false;
109 // a quoted val means we have a string
110 if ((val[0] == '\'' && val[val.Length - 1] == '\'') ||
111 (val[0] == '\"' && val[val.Length - 1] == '\"')) {
113 val = val.Substring(1, val.Length - 2);
115 // if all chars are digits, then we have a int
116 for(int i = 0; i < val.Length; i++)
117 if (!Char.IsDigit(val[i])) {
126 intVal = Int32.Parse (val);
128 throw new ArgumentException (expr + " is not a valid indexed expression.");
132 string property = null;
134 property = expr.Substring (0, openIdx);
135 if (property != null && property != String.Empty)
136 container = GetPropertyValue (container, property);
139 if (container == null)
142 if (container is System.Collections.IList) {
143 IList l = (IList) container;
147 Type t = container.GetType ();
149 // MS does not seem to look for any other than "Item"!!!
150 object [] atts = t.GetCustomAttributes (typeof (DefaultMemberAttribute), false);
151 if (atts.Length != 1)
154 property = ((DefaultMemberAttribute) atts [0]).MemberName;
156 Type [] argTypes = new Type [] { (is_string) ? typeof (string) : typeof (int) };
157 PropertyInfo prop = t.GetProperty (property, argTypes);
159 throw new ArgumentException (expr + " indexer not found.");
161 object [] args = new object [1];
167 return prop.GetValue (container, args);
170 public static string GetIndexedPropertyValue (object container, string expr, string format)
172 object result = GetIndexedPropertyValue (container, expr);
173 return FormatResult (result, format);
176 public static object GetPropertyValue (object container, string propName)
178 if (container == null)
179 throw new ArgumentNullException ("container");
180 if (propName == null)
181 throw new ArgumentNullException ("propName");
183 PropertyDescriptor prop = TypeDescriptor.GetProperties (container).Find (propName, true);
185 throw new HttpException ("Property " + propName + " not found in " +
186 container.GetType ());
189 return prop.GetValue (container);
192 public static string GetPropertyValue (object container, string propName, string format)
194 object result = GetPropertyValue (container, propName);
195 return FormatResult (result, format);
200 static Dictionary<Type, PropertyInfo> dataItemCache;
202 public static object GetDataItem (object container, out bool foundDataItem)
204 foundDataItem = false;
205 if (container == null)
208 if (container is IDataItemContainer) {
209 foundDataItem = true;
210 return ((IDataItemContainer)container).DataItem;
213 PropertyInfo pi = null;
214 if (dataItemCache == null)
215 dataItemCache = new Dictionary<Type, PropertyInfo> ();
217 Type type = container.GetType ();
218 if (!dataItemCache.TryGetValue (type, out pi)) {
219 pi = type.GetProperty ("DataItem", BindingFlags.Public | BindingFlags.Instance);
220 dataItemCache [type] = pi;
226 foundDataItem = true;
228 return pi.GetValue (container, null);
232 public static object GetDataItem (object container)
235 return GetDataItem (container, out flag);