为什么EditorFor在我的ASP.NET MVC 2应用程序抛出ArgumentNullException？ [英] Why is EditorFor in my ASP.NET MVC 2 application throwing ArgumentNullException?

问题描述

我有EditorFor一个奇怪的问题，我的观点之一。下面code抛出ArgumentNullException。

 ＆LT;％：Html.EditorFor（X =＆GT; x.Name）％GT;
 

但是，下面的code是罚款。

 ＆LT;％：Html.TextBoxFor（X =＆GT; x.Name）％GT;
 

Model.Name是一个字符串变量 - 和它的设置

。

EditorFor工作在另一种观点 - 直到这个观点崩溃，在这一点，然后我不得不重新启动开发web服务器（卡西尼）或全部EditorFor调用崩溃与相同的消息

我跑测试与MVC 2源代码，希望我能得到一些见解，但效果还行！ presumably的MVC 2 RTM来源应该有一个在VS2010（日期似乎配合）。

我刚刚切换到TextBoxFor，因为这很好 - 但我想知道是什么问题。我在.NET 4运行，VS2010和Win7 64位。

[更新：发生于DisplayFor同样的问题]

部分堆栈跟踪是：

  [ArgumentNullException：值不能为空。
参数名：流]
   System.IO.StreamReader..ctor（流流，编码编码，布尔detectEncodingFromByteOrderMarks，缓冲区大小的Int32）9496369
   System.Web.UI.TemplateParser.ParseFile（字符串physicalPath，VirtualPath virtualPath）+232
   System.Web.UI.TemplateParser.ParseInternal（）+86
   System.Web.UI.TemplateParser.Parse（）+160
   System.Web.Compilation.BaseTemplateBuildProvider.get_ codeCompilerType（）+110
   System.Web.Compilation.BuildProvider.GetCompilerTypeFromBuildProvider（BuildProvider buildProvider）+65
   System.Web.Compilation.BuildProvidersCompiler.ProcessBuildProviders（）+218
   System.Web.Compilation.BuildProvidersCompiler.PerformBuild（）+ 40
   System.Web.Compilation.BuildManager.CompileWebFile（VirtualPath virtualPath）8945798
   System.Web.Compilation.BuildManager.GetVPathBuildResultInternal（VirtualPath virtualPath，布尔noBuild，布尔allowCrossApp，布尔allowBuildIn precompile，布尔throwIfNotFound，布尔ensureIsUpToDate）+ 320
   System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert（HttpContext的背景下，VirtualPath virtualPath，布尔noBuild，布尔allowCrossApp，布尔allowBuildIn precompile，布尔throwIfNotFound，布尔ensureIsUpToDate）+111
   System.Web.Compilation.BuildManager.GetVirtualPathObjectFactory（VirtualPath virtualPath，HttpContext的背景下，布尔allowCrossApp，布尔throwIfNotFound）+125
   System.Web.Compilation.BuildManager.CreateInstanceFromVirtualPath（VirtualPath virtualPath，类型requiredBaseType，HttpContext的背景下，布尔allowCrossApp）+52
   System.Web.Compilation.BuildManager.CreateInstanceFromVirtualPath（字符串virtualPath，类型requiredBaseType）+28
   System.Web.Mvc.BuildManagerWrapper.System.Web.Mvc.IBuildManager.CreateInstanceFromVirtualPath（字符串virtualPath，类型requiredBaseType）+36
   System.Web.Mvc.WebFormView.Render（ViewContext viewContext，TextWriter的作家）+172
   System.Web.Mvc.Html.TemplateHelpers.ExecuteTemplate（HTML的HtmlHelper，可视数据的ViewDataDictionary，字符串TEMPLATENAME，DataBoundControlMode模式，GetViewNamesDelegate getViewNames）1154
   System.Web.Mvc.Html.TemplateHelpers.TemplateHelper（HTML的HtmlHelper，ModelMetadata元数据，字符串htmlFieldName，字符串TEMPLATENAME，DataBoundControlMode模式，对象additionalViewData，ExecuteTemplateDelegate executeTemplate）1626
   System.Web.Mvc.Html.TemplateHelpers.TemplateHelper（HTML的HtmlHelper，ModelMetadata元数据，字符串htmlFieldName，字符串TEMPLATENAME，DataBoundControlMode模式，对象additionalViewData）+86
   System.Web.Mvc.Html.TemplateHelpers.TemplateFor（HtmlHelper`1 HTML，防爆pression`1前pression，字符串TEMPLATENAME，字符串htmlFieldName，DataBoundControlMode模式，对象additionalViewData，TemplateHelperDelegate templateHelper）+210
   System.Web.Mvc.Html.TemplateHelpers.TemplateFor（HtmlHelper`1 HTML，防爆pression`1前pression，字符串TEMPLATENAME，字符串htmlFieldName，DataBoundControlMode模式，对象additionalViewData）+129
   System.Web.Mvc.Html.EditorExtensions.EditorFor（HtmlHelper`1 HTML，防爆pression`1前pression）+87
 

解决方案

什么是编辑模板样子的财产要传递？ （我假设x.Name是一个字符串，那么你应该在视图称为String.ascx模板/共享/ EditorTemplates）。

这可能是越来越加载字符串编辑模板不喜欢被传递一个空字符串。

如果您还没有字符串自定义编辑器模板（和所有你想要的是一个基本的文本框），则没有理由使用EditorFor。

I have a weird problem with EditorFor in one of my views. The following code throws an ArgumentNullException.

<%: Html.EditorFor(x => x.Name) %>

However, the following code is fine.

<%: Html.TextBoxFor(x => x.Name) %>

Model.Name is a string variable - and it's set.

EditorFor works in another view - until this view crashes, at which point then I have to restart the development web server (Cassini) or all the EditorFor calls crash with the same message.

I ran a test with the MVC 2 source, hoping I could get some insight, but that worked OK! Presumably the MVC 2 RTM source on there should be the one in VS2010 (dates seem to tie in).

I've just switched to TextBoxFor, as that's fine - but I'd like to know what the issue is. I'm running under .NET 4, VS2010 and Win7 x64.

[Update: same issue occurs with DisplayFor.]

Partial stack trace is:

[ArgumentNullException: Value cannot be null.
Parameter name: stream]
   System.IO.StreamReader..ctor(Stream stream, Encoding encoding, Boolean detectEncodingFromByteOrderMarks, Int32 bufferSize) +9496369
   System.Web.UI.TemplateParser.ParseFile(String physicalPath, VirtualPath virtualPath) +232
   System.Web.UI.TemplateParser.ParseInternal() +86
   System.Web.UI.TemplateParser.Parse() +160
   System.Web.Compilation.BaseTemplateBuildProvider.get_CodeCompilerType() +110
   System.Web.Compilation.BuildProvider.GetCompilerTypeFromBuildProvider(BuildProvider buildProvider) +65
   System.Web.Compilation.BuildProvidersCompiler.ProcessBuildProviders() +218
   System.Web.Compilation.BuildProvidersCompiler.PerformBuild() +40
   System.Web.Compilation.BuildManager.CompileWebFile(VirtualPath virtualPath) +8945798
   System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate) +320
   System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate) +111
   System.Web.Compilation.BuildManager.GetVirtualPathObjectFactory(VirtualPath virtualPath, HttpContext context, Boolean allowCrossApp, Boolean throwIfNotFound) +125
   System.Web.Compilation.BuildManager.CreateInstanceFromVirtualPath(VirtualPath virtualPath, Type requiredBaseType, HttpContext context, Boolean allowCrossApp) +52
   System.Web.Compilation.BuildManager.CreateInstanceFromVirtualPath(String virtualPath, Type requiredBaseType) +28
   System.Web.Mvc.BuildManagerWrapper.System.Web.Mvc.IBuildManager.CreateInstanceFromVirtualPath(String virtualPath, Type requiredBaseType) +36
   System.Web.Mvc.WebFormView.Render(ViewContext viewContext, TextWriter writer) +172
   System.Web.Mvc.Html.TemplateHelpers.ExecuteTemplate(HtmlHelper html, ViewDataDictionary viewData, String templateName, DataBoundControlMode mode, GetViewNamesDelegate getViewNames) +1154
   System.Web.Mvc.Html.TemplateHelpers.TemplateHelper(HtmlHelper html, ModelMetadata metadata, String htmlFieldName, String templateName, DataBoundControlMode mode, Object additionalViewData, ExecuteTemplateDelegate executeTemplate) +1626
   System.Web.Mvc.Html.TemplateHelpers.TemplateHelper(HtmlHelper html, ModelMetadata metadata, String htmlFieldName, String templateName, DataBoundControlMode mode, Object additionalViewData) +86
   System.Web.Mvc.Html.TemplateHelpers.TemplateFor(HtmlHelper`1 html, Expression`1 expression, String templateName, String htmlFieldName, DataBoundControlMode mode, Object additionalViewData, TemplateHelperDelegate templateHelper) +210
   System.Web.Mvc.Html.TemplateHelpers.TemplateFor(HtmlHelper`1 html, Expression`1 expression, String templateName, String htmlFieldName, DataBoundControlMode mode, Object additionalViewData) +129
   System.Web.Mvc.Html.EditorExtensions.EditorFor(HtmlHelper`1 html, Expression`1 expression) +87

解决方案

What does the Editor template look like for the property you are passing? (I assume x.Name is a string, so you should have a template called String.ascx in Views/Shared/EditorTemplates).

It likely the editor template that is getting loaded for string does not like a null string being passed.

If you don't have a custom editor template for string (and all you want is a basic textbox), then there is no reason to use EditorFor.

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