如何在 ASP.NET MVC 3 中以特定格式呈现 DateTime? [英] How to render a DateTime in a specific format in ASP.NET MVC 3?

问题描述

如果我的模型类中有一个 DateTime 类型的属性，我如何以特定格式呈现它 - 例如以 ToLongDateString() 返回的格式?

If I have in my model class a property of type DateTime how can I render it in a specific format - for example in the format which ToLongDateString() returns?

我已经试过了...

@Html.DisplayFor(modelItem => item.MyDateTime.ToLongDateString())

...抛出异常，因为表达式必须指向属性或字段.还有这个……

...which throws an exception because the expression must point to a property or field. And this...

@{var val = item.MyDateTime.ToLongDateString();
  Html.DisplayFor(modelItem => val);
}

...它不会抛出异常，但呈现的输出是空的(尽管 val 包含预期值，正如我在调试器中看到的那样).

...which doesn't throw an exception, but the rendered output is empty (although val contains the expected value, as I could see in the debugger).

提前感谢您的提示！

编辑

ToLongDateString 只是一个例子.我真正想要使用的而不是 ToLongDateString 是 DateTime 和 DateTime? 的自定义扩展方法:

ToLongDateString is only an example. What I actually want to use instead of ToLongDateString is a custom extension method of DateTime and DateTime?:

public static string FormatDateTimeHideMidNight(this DateTime dateTime)
{
    if (dateTime.TimeOfDay == TimeSpan.Zero)
        return dateTime.ToString("d");
    else
        return dateTime.ToString("g");
}

public static string FormatDateTimeHideMidNight(this DateTime? dateTime)
{
    if (dateTime.HasValue)
        return dateTime.Value.FormatDateTimeHideMidNight();
    else
        return "";
}

所以，我想我不能在 ViewModel 属性上使用 DisplayFormat 属性和 DataFormatString 参数.

So, I think I cannot use the DisplayFormat attribute and DataFormatString parameter on the ViewModel properties.

推荐答案

如果您只想以特定格式显示日期，只需调用:

If all you want to do is display the date with a specific format, just call:

@String.Format(myFormat, Model.MyDateTime)

使用 @Html.DisplayFor(...) 只是额外的工作，除非您指定模板，或者需要使用基于模板的东西，例如迭代 IEnumerable<;.创建模板非常简单，也可以提供很大的灵活性.在您的视图文件夹中为当前控制器(或共享视图文件夹)创建一个名为 DisplayTemplates 的文件夹.在该文件夹中，添加具有要为其构建模板的模型类型的局部视图.在本例中，我添加了 /Views/Shared/DisplayTemplates 并添加了一个名为 ShortDateTime.cshtml 的部分视图.

Using @Html.DisplayFor(...) is just extra work unless you are specifying a template, or need to use something that is built on templates, like iterating an IEnumerable<T>. Creating a template is simple enough, and can provide a lot of flexibility too. Create a folder in your views folder for the current controller (or shared views folder) called DisplayTemplates. Inside that folder, add a partial view with the model type you want to build the template for. In this case I added /Views/Shared/DisplayTemplates and added a partial view called ShortDateTime.cshtml.

@model System.DateTime

@Model.ToShortDateString()

现在您可以使用以下行调用该模板:

And now you can call that template with the following line:

@Html.DisplayFor(m => m.MyDateTime, "ShortDateTime")

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