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
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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;
40 namespace System.Web.Compilation {
42 [ExpressionEditor("System.Web.UI.Design.AppSettingsExpressionEditor, " + Consts.AssemblySystem_Design)]
43 [ExpressionPrefix("AppSettings")]
44 public class AppSettingsExpressionBuilder : ExpressionBuilder {
46 public override object EvaluateExpression (object target, BoundPropertyEntry entry, object parsedData, ExpressionBuilderContext context)
48 return GetAppSetting (entry.Expression.Trim ());
51 public static object GetAppSetting (string key)
53 string value = WebConfigurationManager.AppSettings [key];
56 throw new InvalidOperationException (String.Format ("App setting {0} not found", key));
60 public static object GetAppSetting (string key, Type targetType, string propertyName)
63 TypeConverter converter = TypeDescriptor.GetConverter (targetType);
64 return converter.ConvertFrom (GetAppSetting (key));
66 catch (NotSupportedException e) {
67 throw new InvalidOperationException (String.Format ("Could not convert app setting {0} to type {1}", key, targetType));
72 public override CodeExpression GetCodeExpression (BoundPropertyEntry entry, object parsedData, ExpressionBuilderContext context)
74 Type type = entry.DeclaringType;
75 PropertyDescriptor descriptor = TypeDescriptor.GetProperties(type)[entry.PropertyInfo.Name];
76 CodeExpression[] expressionArray = new CodeExpression[3];
77 expressionArray[0] = new CodePrimitiveExpression(entry.Expression.Trim());
78 expressionArray[1] = new CodeTypeOfExpression(type);
79 expressionArray[2] = new CodePrimitiveExpression(entry.Name);
80 return new CodeCastExpression(descriptor.PropertyType, new CodeMethodInvokeExpression(new
81 CodeTypeReferenceExpression(base.GetType()), "GetAppSetting", expressionArray));
84 public override bool SupportsEvaluate {