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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / Compilation / RouteValueExpressionBuilder.cs / 1305376 / RouteValueExpressionBuilder.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- 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); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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