1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
//
// System.Web.UI.DataBinder.cs
//
// Authors:
// Duncan Mak (duncan@ximian.com)
// Gonzalo Paniagua Javier (gonzalo@ximian.com)
//
// (C) 2002 Ximian, Inc. (http://www.ximian.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;
using System.Collections;
using System.ComponentModel;
using System.Reflection;
namespace System.Web.UI {
public sealed class DataBinder
{
public DataBinder ()
{
}
private static string FormatResult (object result, string format)
{
if (result == null)
return String.Empty;
if (format == null)
return result.ToString ();
return String.Format (format, result);
}
public static object Eval (object container, string expression)
{
if (expression == null)
throw new ArgumentNullException ("expression");
object current = container;
while (current != null) {
int dot = expression.IndexOf ('.');
int size = (dot == -1) ? expression.Length : dot;
string prop = expression.Substring (0, size);
if (prop.IndexOf ('[') != -1)
current = GetIndexedPropertyValue (current, prop);
else
current = GetPropertyValue (current, prop);
if (dot == -1)
break;
expression = expression.Substring (prop.Length + 1);
}
return current;
}
public static string Eval (object container, string expression, string format)
{
object result = Eval (container, expression);
return FormatResult (result, format);
}
public static object GetIndexedPropertyValue (object container, string expr)
{
if (expr == null)
throw new ArgumentNullException ("expr");
int openIdx = expr.IndexOf ('[');
int closeIdx = expr.IndexOf (']'); // see the test case. MS ignores all after the first ]
if (openIdx < 0 || closeIdx < 0 || closeIdx - openIdx <= 1)
throw new ArgumentException (expr + " is not a valid indexed expression.");
string val = expr.Substring (openIdx + 1, closeIdx - openIdx - 1);
val = val.Trim ();
if (val.Length == 0)
throw new ArgumentException (expr + " is not a valid indexed expression.");
bool is_string = false;
// a quoted val means we have a string
if ((val[0] == '\'' && val[val.Length - 1] == '\'') ||
(val[0] == '\"' && val[val.Length - 1] == '\"')) {
is_string = true;
val = val.Substring(1, val.Length - 2);
} else {
// if all chars are digits, then we have a int
for(int i = 0; i < val.Length; i++)
if (!Char.IsDigit(val[i])) {
is_string = true;
break;
}
}
int intVal = 0;
if (!is_string) {
try {
intVal = Int32.Parse (val);
} catch {
throw new ArgumentException (expr + " is not a valid indexed expression.");
}
}
string property = null;
if (openIdx > 0) {
property = expr.Substring (0, openIdx);
if (property != null && property != String.Empty)
container = GetPropertyValue (container, property);
}
if (container == null)
return null;
if (container is System.Collections.IList) {
IList l = (IList) container;
return l [intVal];
}
Type t = container.GetType ();
// MS does not seem to look for any other than "Item"!!!
object [] atts = t.GetCustomAttributes (typeof (DefaultMemberAttribute), false);
if (atts.Length != 1)
throw new ArgumentException (expr + " indexer not found.");
property = ((DefaultMemberAttribute) atts [0]).MemberName;
Type [] argTypes = new Type [] { (is_string) ? typeof (string) : typeof (int) };
PropertyInfo prop = t.GetProperty (property, argTypes);
if (prop == null)
throw new ArgumentException (expr + " indexer not found.");
object [] args = new object [1];
if (is_string)
args [0] = val;
else
args [0] = intVal;
return prop.GetValue (container, args);
}
public static string GetIndexedPropertyValue (object container, string expr, string format)
{
object result = GetIndexedPropertyValue (container, expr);
return FormatResult (result, format);
}
public static object GetPropertyValue (object container, string propName)
{
if (propName == null)
throw new ArgumentNullException ("propName");
PropertyDescriptor prop = TypeDescriptor.GetProperties (container).Find (propName, true);
if (prop == null) {
throw new HttpException ("Property " + propName + " not found in " +
container.GetType ());
}
return prop.GetValue (container);
}
public static string GetPropertyValue (object container, string propName, string format)
{
object result = GetPropertyValue (container, propName);
return FormatResult (result, format);
}
#if NET_2_0
public static object GetDataItem (object container, out bool foundDataItem)
{
foundDataItem = false;
if (container == null)
return null;
PropertyInfo pi = container.GetType ().GetProperty ("DataItem", BindingFlags.Public | BindingFlags.Instance);
if (pi == null)
return null;
foundDataItem = true;
return pi.GetValue (container, null);
}
public static object GetDataItem (object container)
{
bool flag;
return GetDataItem (container, out flag);
}
#endif
}
}
|