DateTime 的 Razor DisplayFor = 输入字符串的格式不正确

Question

最近，我为我的 MVC 4 应用程序更新了几个引用的程序集并升级到 MVC 5.1。不确定这是否与它有关。

模型

[Display(Name = "Start")]
[DisplayFormat(DataFormatString = "{0t}")]
public System.DateTime StartDateTime { get; set; }

现在我在一个简单的 razor html helper 上遇到一个奇怪的错误

@Html.DisplayFor(model => model.StartDateTime)

给出错误：Input string was not in a correct format。

如果您查看调试器中该字段的值，它是 System.DateTime 类型并显示： 2/28/2014 10:17 AM

更改为 a@Html.EditorFor会正确呈现数据时间。

我的 DisplayTemplates 文件夹是空的。

堆：

[FormatException: Input string was not in a correct format.]
   System.Text.StringBuilder.AppendFormat(IFormatProvider provider, String format, Object[] args) +14321177
   System.String.Format(IFormatProvider provider, String format, Object[] args) +136
   System.Web.Mvc.Html.TemplateHelpers.TemplateHelper(HtmlHelper html, ModelMetadata metadata, String htmlFieldName, String templateName, DataBoundControlMode mode, Object additionalViewData, ExecuteTemplateDelegate executeTemplate) +775
   System.Web.Mvc.Html.TemplateHelpers.TemplateHelper(HtmlHelper html, ModelMetadata metadata, String htmlFieldName, String templateName, DataBoundControlMode mode, Object additionalViewData) +241
   System.Web.Mvc.Html.TemplateHelpers.TemplateFor(HtmlHelper`1 html, Expression`1 expression, String templateName, String htmlFieldName, DataBoundControlMode mode, Object additionalViewData, TemplateHelperDelegate templateHelper) +332
   System.Web.Mvc.Html.TemplateHelpers.TemplateFor(HtmlHelper`1 html, Expression`1 expression, String templateName, String htmlFieldName, DataBoundControlMode mode, Object additionalViewData) +333
   System.Web.Mvc.Html.DisplayExtensions.DisplayFor(HtmlHelper`1 html, Expression`1 expression) +151
   ASP._Page_Areas_Mobile_Views_LogTimeForPart_CurrentTask_cshtml.Execute() in c:\Users\Chad\documents\Incite Systems\clients\hh metals\20 - development\otis\app\otis.web\Areas\Mobile\Views\LogTimeForPart\CurrentTask.cshtml:41
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +392
   System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +165
   System.Web.WebPages.StartPage.RunPage() +77
   System.Web.WebPages.StartPage.ExecutePageHierarchy() +123
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +212
   System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance) +1161
   System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) +639
   System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +828
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) +65
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +178
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +1131
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) +181
   System.Web.Mvc.Async.<>c__DisplayClass2b.<BeginInvokeAction>b__1c() +549
   System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) +330
   System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +71
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +196
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +73
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +58
   System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +90
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +188
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +196
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +73
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +50
   System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +68
   System.Web.Mvc.Controller.<BeginExecute>b__15(IAsyncResult asyncResult, Controller controller) +60
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +85
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +196
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +73
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +50
   System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +58
   System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +60
   System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +93
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +188
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +196
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +73
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +50
   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +58
   System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +59
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +606
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +288

Answer 1

例如，尝试指定 DisplayFormat 属性（在您的模型属性上）：

[DisplayFormat(DataFormatString = "{0:C}")]
public DateTime StartDateTime { get; set; }

根据编辑过的问题进行编辑：

您的显示格式中的语法不正确 - 缺少冒号。做到这一点（通知之间的冒号0和t）：

[Display(Name = "Start")]
[DisplayFormat(DataFormatString = "{0:t}")]
public System.DateTime StartDateTime { get; set; }