Binding nullable datetime in MVC with String format

Question

i am unable to solve problem from last two days.

@Html.TextBoxFor(model => model.myObject.dateAssign, String.Format("{0:MM/dd/yy}"))

here, dateAssign is nullable datetime. it may be or maybe not have value.

i am keep getting following error

Index (zero based) must be greater than or equal to zero and less than the size of the argument list.

please give me some hint or direction

"" is not date, ?? will throw error, as DateTime is valuetype and string is reference type — A.T.
– A.T., Commented Nov 8, 2013 at 7:00

germi · Accepted Answer · 2013-11-09 06:28:26Z

4

String.Format() needs a second argument (see documentation) - in your case your date.

Have a look at this page for date formats.

Then you would write something like

@Html.TextBox(model => String.Format("{0:MM/dd/yy}", model.myObject.dateAssign))

Or, if you want to use @Html.TextBoxFor, you can annotate your property like this:

// in your model:
[DisplayFormat(DataFormatString = "{0:MM/dd/yy}", ApplyFormatInEditMode= true]
DateTime? dateAssign { get; set; }  

// and in your view:
@Html.TextBoxFor(model => model.myObject.dateAssign)

edited Nov 9, 2013 at 6:28

answered Nov 8, 2013 at 6:58

germi

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4 Comments

A.T. Over a year ago

here date is nullable

A.T. Over a year ago

i tried but that changes the error to "Templates can be used only with field access, property access, single-dimension array index, or single-parameter custom indexer expressions."

germi Over a year ago

String.Format works with null, too. It's just empty, then. To your second question: Replace @Html.TextBoxFor with @Html.TextBox. That should work.

A.T. Over a year ago

The [DisplayFormat] attribute is only used in EditorFor/DisplayFor, and not by the raw HTML APIs like TextBoxFor and also DisplayFormat works when we set ApplyFormatInEditMode= true in dataanotations

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