如何呈现在ASP.NET MVC 3特定格式的日期时间？ [英] How to render a DateTime in a specific format in ASP.NET MVC 3?

问题描述

如果我在我的模型类类型的属性的DateTime 我怎么能使其在一个特定的格式 - 例如在格式， ToLongDateString（）回报？

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?

我已经试过这...

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

...它抛出一个异常，因为前pression必须指向一个属性或字段。这...

...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);
}

...这并不抛出异常，但呈现的输出是空的（虽然 VAL 包含预期值，因为我可以在调试器中看到的）。

...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).

感谢提前提示！

修改

ToLongDateString 仅仅是一个例子。我真的想使用，而不是 ToLongDateString 是的DateTime 自定义扩展方法和的DateTime ？：

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，我想我不能使用 DisplayFormat 属性和 DataFormatString 的视图模型性能参数。

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

推荐答案

如果你想要做的是显示与特定格式的日期，只要致电：

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（...）仅仅是额外的工作，除非你指定一个模板，或者需要使用内置模板的东西，比如迭代一个的IEnumerable＆LT; T＆GT; 。创建模板是很简单的，并能提供很大的灵活性了。创建一个文件夹在你的看法名为电流控制器（或共享文件夹的意见）夹 DisplayTemplates 。这个文件夹里，添加你想建立模板模型类型的局部视图。在这种情况下，我加入 /查看/共享/ DisplayTemplates ，并增加了一个叫做局部视图 ShortDateTime.cshtml 。

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()

现在你可以调用具有以下行的模板：

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

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

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