Posted By

jmcd on 01/25/10

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Last Edited at 01/25/10 10:33am

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LinkBuilder For Areas in ASP.NET MVC2

/ Published in: C#

The LinkBuilder implementation provided with the MVC Futures assembly does not work with areas. This re-implementation matches routes with areas via declared namespaces.

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public static class AreaLinkBuilder
{
    public static string BuildUrlFromExpression<TController>(RequestContext context, RouteCollection routeCollection, Expression<Action<TController>> action) where TController : Controller
    {
        var memberInfo = ExpressionMemberFinder.FindMemberOrNull(action);
        var targetNamespace = memberInfo.DeclaringType.Namespace;

var routeValues = ExpressionHelper.GetRouteValuesFromExpression(action);
        var vpd = collection.GetVirtualPath(context, routeValues);
        return (vpd == null) ? null : vpd.VirtualPath;
    }
}

public class ExpressionMemberFinder
{
    public static MemberInfo FindMemberOrNull(Expression expression)
    {
        switch (expression.NodeType)
        {
            case ExpressionType.Coalesce:
                return FindMemberOrNull(((BinaryExpression)expression).Left) ?? FindMemberOrNull(((BinaryExpression)expression).Right);
            case ExpressionType.Convert:
                return FindMemberOrNull(((UnaryExpression)expression).Operand);
            case ExpressionType.Lambda:
                return FindMemberOrNull(((LambdaExpression)expression).Body);
            case ExpressionType.Call:
                return ((MethodCallExpression)expression).Method;
            case ExpressionType.MemberAccess:
                return ((MemberExpression)expression).Member;
            default:
                return null;
        }
    }
}

public static class ControllerExtensions
    {
        public static string ActionUrl<TController>(this Controller @this, Expression<Action<TController>> action) where TController : Controller
        {
            return AreaLinkBuilder.BuildUrlFromExpression(@this.ControllerContext.RequestContext, RouteTable.Routes, action);
        }
    }

public static class ViewExtensions
    {
        public static string ActionUrl<TController>(this SparkView @this, Expression<Action<TController>> action) where TController : Controller
        {
            return AreaLinkBuilder.BuildUrlFromExpression(@this.ViewContext.RequestContext, RouteTable.Routes, action);
        }
    }

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