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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;
using System.Web.Routing;
using System.Collections.Generic;
[ExpressionPrefix("Routes")]
[ExpressionEditor("System.Web.UI.Design.RouteValueExpressionEditor, " + AssemblyRef.SystemDesign)]
public class RouteValueExpressionBuilder : ExpressionBuilder {
public override bool SupportsEvaluate {
get {
return true;
}
}
public override CodeExpression GetCodeExpression(BoundPropertyEntry entry,
object parsedData, ExpressionBuilderContext context) {
return new CodeMethodInvokeExpression(
new CodeTypeReferenceExpression(this.GetType()),
"GetRouteValue",
new CodePropertyReferenceExpression(new CodeThisReferenceExpression(), "Page"),
new CodePrimitiveExpression(entry.Expression.Trim()),
new CodeTypeOfExpression(new CodeTypeReference(entry.ControlType)),
new CodePrimitiveExpression(entry.Name)
);
}
public override object EvaluateExpression(object target, BoundPropertyEntry entry,
object parsedData, ExpressionBuilderContext context) {
// Target should always be a control
Control control = target as Control;
if (control == null)
return null;
return GetRouteValue(context.TemplateControl.Page, entry.Expression.Trim(), entry.ControlType, entry.Name);
}
internal static object ConvertRouteValue(object value, Type controlType, string propertyName) {
// Try to do any type converting necessary for the property set
if (controlType != null && !String.IsNullOrEmpty(propertyName)) {
PropertyDescriptor propDesc = TypeDescriptor.GetProperties(controlType)[propertyName];
if (propDesc != null) {
if (propDesc.PropertyType != typeof(string)) {
TypeConverter converter = propDesc.Converter;
if (converter.CanConvertFrom(typeof(string))) {
return converter.ConvertFrom(value);
}
}
}
}
return value;
}
// Format will be <%$ RouteValue: Key %>, controlType,propertyName are used to figure out what typeconverter to use
public static object GetRouteValue(Page page, string key, Type controlType, string propertyName) {
if (page == null || String.IsNullOrEmpty(key) || page.RouteData == null) {
return null;
}
return ConvertRouteValue(page.RouteData.Values[key], controlType, propertyName);
}
}
}
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