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//------------------------------------------------------------------------------
// <copyright file="AppSettingsExpressionBuilder.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.Compilation {
using System;
using System.Security.Permissions;
using System.CodeDom;
using System.ComponentModel;
using System.Configuration;
using System.Diagnostics;
using System.Web.UI;
[ExpressionPrefix("AppSettings")]
[ExpressionEditor("System.Web.UI.Design.AppSettingsExpressionEditor, " + AssemblyRef.SystemDesign)]
public class AppSettingsExpressionBuilder : ExpressionBuilder {
public override bool SupportsEvaluate {
get {
return true;
}
}
public override CodeExpression GetCodeExpression(BoundPropertyEntry entry,
object parsedData, ExpressionBuilderContext context) {
if (entry.DeclaringType == null || entry.PropertyInfo == null) {
return new CodeMethodInvokeExpression(
new CodeTypeReferenceExpression(this.GetType()),
"GetAppSetting",
new CodePrimitiveExpression(entry.Expression.Trim()));
}
else {
return new CodeMethodInvokeExpression(
new CodeTypeReferenceExpression(this.GetType()),
"GetAppSetting",
new CodePrimitiveExpression(entry.Expression.Trim()),
new CodeTypeOfExpression(entry.DeclaringType),
new CodePrimitiveExpression(entry.PropertyInfo.Name));
}
}
public override object EvaluateExpression(object target, BoundPropertyEntry entry,
object parsedData, ExpressionBuilderContext context) {
return GetAppSetting(entry.Expression, target.GetType(), entry.PropertyInfo.Name);
}
public static object GetAppSetting(string key) {
string value = ConfigurationManager.AppSettings[key];
if (value == null) {
throw new InvalidOperationException(SR.GetString(SR.AppSetting_not_found, key));
}
return value;
}
public static object GetAppSetting(string key, Type targetType, string propertyName) {
string value = ConfigurationManager.AppSettings[key];
if (targetType != null) {
PropertyDescriptor propDesc = TypeDescriptor.GetProperties(targetType)[propertyName];
if (propDesc != null) {
if (propDesc.PropertyType != typeof(string)) {
TypeConverter converter = propDesc.Converter;
if (converter.CanConvertFrom(typeof(string))) {
return converter.ConvertFrom(value);
}
else {
throw new InvalidOperationException(SR.GetString(SR.AppSetting_not_convertible, value, propDesc.PropertyType.Name, propDesc.Name));
}
}
}
}
if (value == null) {
throw new InvalidOperationException(SR.GetString(SR.AppSetting_not_found, key));
}
return value;
}
}
}
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