ASP.NET MVC Manually Applying DisplayFormat

Question

I have a model with a property which is a generic looking something like:

class PairedData<T>
{
    public T Value {get;set;}
    public bool IsValid {get;set;}
}

In the model I have:

class SomeModel
{
    [UIHint ("PairedInt")]
    public PairedData<int> SomeInt {get;set;}

    [UIHint ("PairedDateTime")]
    [DisplayFormat(DataFormatString = "{0:dd/MM/yyyy}"]
    public PairedData<DateTime> SomeDate {get;set;}
}

Then in my Display Template for PairedDateTime I have:

 @model PairedData<DateTime>

 @Html.DisplayFor(m => m.Value)

The problem is that the DisplayFor doesn't apply the date format. The reason is obvious enough - the DisplayFormat attribute is on SomeDate, not on the Value property, so is not being read.

So the question is, is there a way to tell the DisplayFor to read the attribute from somewhere else? Or is there a way to manually pass the same information to DisplayFor within the Display Template? Or is there a way to apply the attribute to Value only in the DateTime instantiation (unlikely, I think)?

Thanks in advance.

score 1 · Answer 1 · edited May 23 '17 at 11:59

1

You can try to format this on view if you are sure this will always be a DateTime:

@Html.DisplayFor(m => m.Value, "{0:dd/MM/yyyy}", new {maxlength=10})

This works, but I would recommend you the approach suggested by Daryl and bkaid here: https://stackoverflow.com/a/6733855/1638261

edited May 23 '17 at 11:59

Community

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1

answered Apr 07 '16 at 09:35

jomsk1e

3,585
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Thanks - that'll do in this specific situation. I'd still be interested in a more general approach. – Jasper Kent Apr 07 '16 at 09:37
Actually, that doesn't seem to work. The string parameter is a template name, not a date format. I don't see anything in the linked article about formatting. – Jasper Kent Apr 07 '16 at 09:45

Patrick Mcvay · Answer 2 · 2016-04-19T19:36:52.350

0

The DataType Annotation will give you the date format by default mm/dd/yyyy and the input for this will be a drop down list and combined with the DisplayFormat should give you the results that you are looking for.

[DataType(DataType.Date)]
[DisplayFormat(DataFormatString = "{0:dd/MM/yyyy}", ApplyFormatInEditMode = true)]

edited Apr 19 '16 at 19:36

answered Apr 08 '16 at 15:13

Patrick Mcvay

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The problem is I'm using a generic so although that annotation is appropriate for the DateTime instantiation, it's not for, say, int. The question remains - how do I apply different attribute to different instantiations of the generic? – Jasper Kent Apr 10 '16 at 19:01

ASP.NET MVC Manually Applying DisplayFormat

2 Answers2