Question

我们刚刚升级了我们的应用程序，发现我们在所有的Html.ValidationMessages和Html.ValidationMessageFor上都遇到了运行时错误。错误是：字典中没有给定的密钥。我们一直在传递modelName / expression，它在升级之前工作正常。我还检查了自述文件中描述的重大更改，但没有注意到与之相关的任何内容。

Answer 1

在调试ASP.NET MVC源代码后，我找到了导致此问题的原因。

您必须拥有＆lt;％= Html.EnableClientSideValidation％＆gt;在＆lt;％Html.BeginForm％＆gt;之前，这样做的原因是，当启用客户端验证时，Html表单帮助程序将生成在验证帮助程序中使用的Id（formContext.FormId）。这意味着如果要使用验证帮助程序，则必须使用内置表单帮助程序。

所以要解决这个问题，只需移动＆lt;％= Html.EnableClientSideValidation％＆gt;到第一个表单之上，并确保使用Html.BeginForm帮助方法。

Answer 2

我在这里遇到了同样的错误，Levi，我知道你在asp.net mvc团队，你能提供一些指导吗？

这是错误。

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:

这是追踪。

[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

从MVC 2.0 Beta验证问题升级ASP.Net MVC RC 2.0

2 个答案: