.net – asp.net MVC – ValidationSummary not displaying

asp.net-mvcnetvalidation

I have a strange problem whereby the ValidationSummary is not being displayed. However, the ValidationMessage's are being displayed. I've checked the output page source and it's not as though they are in a colour that is obscuring them. I'm using the RC. Any ideas?

Edit:
Break point set at ValidationSummary shows:

ViewData.ModelState.Values[1].ErrorMessage = ""
ViewData.ModelState.Values[1].Exception.InnerException.Message = "4a is not a valid value for Int32"

Does ValidationSummary use ErrorMessage and ValidationMessage use InnerException.Message?

My view code is:

<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master"
Inherits="System.Web.Mvc.ViewPage<App.Models.PurchaseOrdersView>" %>


<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
    <title>Edit</title>
</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">

    <h2>Edit</h2>

    <%= Html.ValidationSummary() %>

    <% Html.BeginForm("Edit", "PurchaseOrder", FormMethod.Post); %>
    <table>
        <tr>
            <td>
                Purchase Order Id:
            </td>
            <td>
                <%= Html.TextBox("PurchaseOrderId", Model.PurchaseOrderId)%>
                <%= Html.ValidationMessage("PurchaseOrderId")%>
            </td>
        </tr>
        <tr>
            <td>
                Date:
            </td>
            <td>
                <%= Html.TextBox("Date", Model.Date.ToString("dd-MMM-yyyy"))%>
                <%= Html.ValidationMessage("Date")%>
            </td>
        </tr>
    </table>
    <input type="submit" value="Save" />

    <% Html.EndForm(); %>

</asp:Content>

Best Answer

Try

<%= Html.ValidationSummary(false) %>

Related Solutions

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From the readme word doc for RC1 (not indexed by google)

ASP.NET Compiler Post-Build Step

Currently, errors within a view file are not detected until run time. To let you detect these errors at compile time, ASP.NET MVC projects now include an MvcBuildViews property, which is disabled by default. To enable this property, open the project file and set the MvcBuildViews property to true, as shown in the following example:

<Project ToolsVersion="3.5" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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Note Enabling this feature adds some overhead to the build time.

You can update projects that were created with previous releases of MVC to include build-time validation of views by performing the following steps:

Open the project file in a text editor.
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<Target Name="AfterBuild" Condition="'$(MvcBuildViews)'=='true'">
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For MVC v5 use EnumHelper

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For MVC 5 and lower

I rolled Rune's answer into an extension method:

namespace MyApp.Common
{
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This allows you to write:

ViewData["taskStatus"] = task.Status.ToSelectList();

by using MyApp.Common