/src/MvcFutures/Mvc/FormExtensions.cs

namespace Microsoft.Web.Mvc {

    using System;

    using System.Collections.Generic;

    using System.Diagnostics.CodeAnalysis;

    using System.Linq.Expressions;

    using System.Web;

    using System.Web.Mvc;

    using System.Web.Mvc.Html;

    using System.Web.Routing;



    [AspNetHostingPermission(System.Security.Permissions.SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]

    public static class FormExtensions {

        [SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures", Justification = "This is an Extension Method which allows the user to provide a strongly-typed argument via Expression")]

        public static MvcForm BeginForm<TController>(this HtmlHelper helper, Expression<Action<TController>> action) where TController : Controller {

            return BeginForm<TController>(helper, action, FormMethod.Post, null);

        }



        [SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures", Justification = "This is an Extension Method which allows the user to provide a strongly-typed argument via Expression")]

        public static MvcForm BeginForm<TController>(this HtmlHelper helper, Expression<Action<TController>> action, FormMethod method) where TController : Controller {

            return BeginForm<TController>(helper, action, method, null);

        }



        [SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures", Justification = "This is an Extension Method which allows the user to provide a strongly-typed argument via Expression")]

        public static MvcForm BeginForm<TController>(this HtmlHelper helper, Expression<Action<TController>> action, FormMethod method, object htmlAttributes) where TController : Controller {

            return BeginForm<TController>(helper, action, method, new RouteValueDictionary(htmlAttributes));

        }



        [SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures", Justification = "This is an Extension Method which allows the user to provide a strongly-typed argument via Expression")]

        public static MvcForm BeginForm<TController>(this HtmlHelper helper, Expression<Action<TController>> action, FormMethod method, IDictionary<string, object> htmlAttributes) where TController : Controller {

            TagBuilder tagBuilder = new TagBuilder("form");

            tagBuilder.MergeAttributes(htmlAttributes);

            string formAction = LinkExtensions.BuildUrlFromExpression(helper, action);

            tagBuilder.MergeAttribute("action", formAction);

            tagBuilder.MergeAttribute("method", HtmlHelper.GetFormMethodString(method));

         

            HttpResponseBase httpResponse = helper.ViewContext.HttpContext.Response;

            httpResponse.Write(tagBuilder.ToString(TagRenderMode.StartTag));

            return new MvcForm(helper.ViewContext.HttpContext.Response);

        }

    }

}