2 // System.Web.Compilation.AppSettingsExpressionBuilder
5 // Chris Toshok (toshok@ximian.com)
7 // (C) 2006 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.
35 using System.ComponentModel;
36 using System.Configuration;
37 using System.Web.Configuration;
39 using System.Reflection;
41 namespace System.Web.Compilation {
43 [ExpressionEditor("System.Web.UI.Design.AppSettingsExpressionEditor, " + Consts.AssemblySystem_Design)]
44 [ExpressionPrefix("AppSettings")]
45 public class AppSettingsExpressionBuilder : ExpressionBuilder {
47 public override object EvaluateExpression (object target, BoundPropertyEntry entry, object parsedData, ExpressionBuilderContext context)
49 return GetAppSetting (entry.Expression.Trim ());
52 public static object GetAppSetting (string key)
54 string value = WebConfigurationManager.AppSettings [key];
57 throw new InvalidOperationException (String.Format ("The application setting '{0}' was not found.", key));
61 public static object GetAppSetting (string key, Type targetType, string propertyName)
63 object value = GetAppSetting (key);
65 if (targetType == null)
66 return value.ToString ();
68 PropertyInfo pi = targetType.GetProperty(propertyName);
70 return value.ToString ();
73 TypeConverter converter = TypeDescriptor.GetConverter (pi.PropertyType);
74 return converter.ConvertFrom (value);
75 } catch (NotSupportedException) {
76 throw new InvalidOperationException (String.Format (
77 "Could not convert application setting '{0}' " +
78 " to type '{1}' for property '{2}'.", value,
79 pi.PropertyType.Name, pi.Name));
84 public override CodeExpression GetCodeExpression (BoundPropertyEntry entry, object parsedData, ExpressionBuilderContext context)
86 Type type = entry.DeclaringType;
87 PropertyDescriptor descriptor = TypeDescriptor.GetProperties(type)[entry.PropertyInfo.Name];
88 CodeExpression[] expressionArray = new CodeExpression[3];
89 expressionArray[0] = new CodePrimitiveExpression(entry.Expression.Trim());
90 expressionArray[1] = new CodeTypeOfExpression(entry.Type);
91 expressionArray[2] = new CodePrimitiveExpression(entry.Name);
92 return new CodeCastExpression(descriptor.PropertyType, new CodeMethodInvokeExpression(new
93 CodeTypeReferenceExpression(base.GetType()), "GetAppSetting", expressionArray));
96 public override bool SupportsEvaluate {