102 lines
3.5 KiB
C#
102 lines
3.5 KiB
C#
//
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// System.Web.Compilation.AppSettingsExpressionBuilder
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//
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// Authors:
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// Chris Toshok (toshok@ximian.com)
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//
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// (C) 2006-2009 Novell, Inc (http://www.novell.com)
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//
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.CodeDom;
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using System.ComponentModel;
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using System.Configuration;
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using System.Web.Configuration;
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using System.Web.UI;
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using System.Reflection;
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namespace System.Web.Compilation
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{
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[ExpressionEditor("System.Web.UI.Design.AppSettingsExpressionEditor, " + Consts.AssemblySystem_Design)]
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[ExpressionPrefix("AppSettings")]
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public class AppSettingsExpressionBuilder : ExpressionBuilder
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{
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public override object EvaluateExpression (object target, BoundPropertyEntry entry, object parsedData, ExpressionBuilderContext context)
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{
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return GetAppSetting (entry.Expression.Trim ());
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}
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public static object GetAppSetting (string key)
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{
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string value = WebConfigurationManager.AppSettings [key];
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if (value == null)
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throw new InvalidOperationException (String.Format ("The application setting '{0}' was not found.", key));
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return value;
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}
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public static object GetAppSetting (string key, Type targetType, string propertyName)
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{
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object value = GetAppSetting (key);
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if (targetType == null)
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return value.ToString ();
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PropertyInfo pi = targetType.GetProperty(propertyName);
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if (pi == null)
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return value.ToString ();
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try {
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TypeConverter converter = TypeDescriptor.GetConverter (pi.PropertyType);
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return converter.ConvertFrom (value);
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} catch (NotSupportedException) {
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throw new InvalidOperationException (String.Format (
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"Could not convert application setting '{0}' " +
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" to type '{1}' for property '{2}'.", value,
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pi.PropertyType.Name, pi.Name));
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}
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}
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public override CodeExpression GetCodeExpression (BoundPropertyEntry entry, object parsedData, ExpressionBuilderContext context)
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{
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Type type = entry.DeclaringType;
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PropertyDescriptor descriptor = TypeDescriptor.GetProperties(type)[entry.PropertyInfo.Name];
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CodeExpression[] expressionArray = new CodeExpression[3];
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expressionArray[0] = new CodePrimitiveExpression(entry.Expression.Trim());
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expressionArray[1] = new CodeTypeOfExpression(entry.Type);
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expressionArray[2] = new CodePrimitiveExpression(entry.Name);
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return new CodeCastExpression(descriptor.PropertyType, new CodeMethodInvokeExpression(new
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CodeTypeReferenceExpression(base.GetType()), "GetAppSetting", expressionArray));
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}
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public override bool SupportsEvaluate {
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get { return true; }
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}
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}
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}
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