DateTime接受超过4位数字的年份

Question

In my test application I have a datetime field defined as such:

[Required(ErrorMessage = "This is required")]
[Display(Name = "test date:")]
[DataType(DataType.Date)]        
[DisplayFormat(DataFormatString = "{0:dd/MMMM/yyyy}", ApplyFormatInEditMode = true)]
public DateTime? date1 { get; set; }

and in my view:

@Html.EditorFor(
    model => model.date1,
    new {
        htmlAttributes = new {
            @Value = Model.date1 != null ? Model.date1.Value.ToString("yyyy-MM-dd") : ""
        }
    })
@Html.ValidationMessageFor(model => model.date1, "", new { @class = "text-danger" })

Everything works fine but when I enter a date like 10/03/19999 (dd,MM,yyyyy), the application breaks, obviously the date I've entered is wrong but i'm not sure how to action the error. I've tried using datetime.tryparse to postback on failure but then i lose what i filled the form in with.

Update:

Following quadzz solution, I've tried:

[Required(ErrorMessage = "This is required")]
[Display(Name = "test date:")]
[DataType(DataType.Date)]
[Range(typeof(DateTime), "1/1/1900", "31/12/2000", ErrorMessage = "Value for {0} must be between {1} and {2}")]
[DisplayFormat(DataFormatString = "{0:dd/MM/yyyy}", ApplyFormatInEditMode = true)]

but it still doesn't work.

Answer 1

Try ranging your datetime field. Reference here: https://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations.rangeattribute.aspx

Example:

    [Range(typeof(DateTime), "1/1/2000", "1/1/2010",
        ErrorMessage = "Value for {0} must be between {1:d} and {2:d}")]
    [DataType(DataType.Date)]

Answer 2

Perform client side validation before sending data to server. Though server side validation is also required your scenario could be handled by client side validation to do so include following js files in layout file

1. jquery
2. jquery.validate
3. jquery.validate.unobtrusive

So your view should be like

@Html.EditorFor(
    model => model.date1,
    new {
        htmlAttributes = new {
            @Value = Model.date1 != null ? Model.date1.Value.ToString("yyyy-MM-dd") : "",
            @Readonly="readonly"
        }
    })
@Html.ValidationMessageFor(model => model.date1, "", new { @class = "text-danger" })

I have made Editor readonly so that user picks date from datepicker library (manual date entry is prohibited)[Though it can be easily bypassed]

If client side validation is passed or client submit data by disabling javascript you need to perform server side validation which can be done in controller by checking ModelState

[HttpPost]
public ActionResult Employee(EmployeeModel employee)
{
  if(ModelState.IsValid)
  {
    //Everything is good to process
  }
  return View(employee);//returns view with model error if any
}

Answer 3

A couple of solutions:

Add client side validation to check the date before sending it to the server (and of course keep the server validation you do now as well). Doing this you reduce your problem to an almost insignificant number of cases (those users who doesn't have javascript enabled and input a wrong date).

Or another solution:

Change your date1 field to a string. If your date is not correct, send the original value back to your page.

DateTime date;

if (DateTime.TryParse(date1, out temp))    
{
    //The date is fine, save it.
}
else
{
    ModelState.AddError("date1", "Incorrect date: " + date1);
}

Then in your editor you just display a normal text field, don't need to make a conversion.