從MVC 2.0 Beta驗證問題升級ASP.Net MVC RC 2.0

Question

我們剛剛升級了我們的應用程序，發現我們在所有Html.ValidationMessages和Html.ValidationMessageFor上都遇到了運行時錯誤。 錯誤是： 字典中沒有給定的密鑰。 我們一直在傳遞modelName / expression，它在升級之前工作正常。 我還檢查了自述文件中描述的重大更改，但沒有注意到與之相關的任何內容。

Answer 1

在調試ASP.NET MVC源代碼后，我找到了導致此問題的原因。

你必須在<％Html.BeginForm％>之前有<％= Html.EnableClientSideValidation％>，原因是當啟用客戶端驗證時，Html表單助手將生成一個使用的Id（formContext.FormId）在驗證助手中。 這意味着如果要使用驗證幫助程序，則必須使用內置表單幫助程序。

因此，要解決此問題，只需將<％= Html.EnableClientSideValidation％>移動到第一個表單上方，並確保使用Html.BeginForm幫助程序方法。

Answer 2

我在這里得到了同樣的錯誤，Levi，我知道你在asp.net mvc團隊，你能提供一些指導嗎？

這是錯誤。

Line 185:                // rules will already have been written to the metadata object
Line 186:                fieldMetadata.ReplaceValidationMessageContents = (String.IsNullOrEmpty(validationMessage)); // only replace contents if no explicit message was specified
Line 187:                fieldMetadata.ValidationMessageId = builder.Attributes["id"];
Line 188:            }
Line 189:

這是痕跡。

[KeyNotFoundException: The given key was not present in the dictionary.]
   System.ThrowHelper.ThrowKeyNotFoundException() +29
   System.Collections.Generic.SortedDictionary`2.get_Item(TKey key) +5167507
   System.Web.Mvc.Html.ValidationExtensions.ValidationMessageHelper(HtmlHelper htmlHelper, ModelMetadata modelMetadata, String expression, String validationMessage, IDictionary`2 htmlAttributes) in D:\Projects\Practice\Mercurial\onlinerestaurant\trunk\ReferenceProjects\aspnetmvc2-rc-sources\src\SystemWebMvc\Mvc\Html\ValidationExtensions.cs:187
   System.Web.Mvc.Html.ValidationExtensions.ValidationMessageFor(HtmlHelper`1 htmlHelper, Expression`1 expression, String validationMessage, IDictionary`2 htmlAttributes) in D:\Projects\Practice\Mercurial\onlinerestaurant\trunk\ReferenceProjects\aspnetmvc2-rc-sources\src\SystemWebMvc\Mvc\Html\ValidationExtensions.cs:146
   System.Web.Mvc.Html.ValidationExtensions.ValidationMessageFor(HtmlHelper`1 htmlHelper, Expression`1 expression) in D:\Projects\Practice\Mercurial\onlinerestaurant\trunk\ReferenceProjects\aspnetmvc2-rc-sources\src\SystemWebMvc\Mvc\Html\ValidationExtensions.cs:131
   ASP.views_admin_createmenucategory_ascx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in d:\Projects\Practice\Mercurial\onlinerestaurant\trunk\OnlineRestaurant\Views\Admin\CreateMenuCategory.ascx:26
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +256
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19
   System.Web.UI.Control.Render(HtmlTextWriter writer) +10
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +134
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19
   System.Web.UI.Page.Render(HtmlTextWriter writer) +29
   System.Web.Mvc.ViewPage.Render(HtmlTextWriter writer) in D:\Projects\Practice\Mercurial\onlinerestaurant\trunk\ReferenceProjects\aspnetmvc2-rc-sources\src\SystemWebMvc\Mvc\ViewPage.cs:107
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1266