RouteValueExpressionBuilder.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 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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