ASP.NET MVC data annotations with partial class doesn't work

Question

I have applied some validation with data annotations but somehow I am missing something in the code.

public class Person 
{
    public people SinglePerson { get; set; }
    public IEnumerable<SelectListItem> ColorNames { get; set; }
    public IEnumerable<SelectListItem> WebCustomer { get; set; }
    public IEnumerable<SelectListItem> PreviouslyOredered { get; set; }
}

and here is my cs class

[MetadataType(typeof(peopleMetaData))]
public partial class people
{
}

public class peopleMetaData
{
    [Required(ErrorMessage = "Please enter a name")]
    [StringLength(50, MinimumLength = 2)]
    public string firstName { get; set; }
}

The People class has a firstName property that I want to do some validation to.

What am I missing?

did you apply the check for model in the controller ??

moath naji
– moath naji

2017-08-23 22:56:49 +00:00
Commented Aug 23, 2017 at 22:56 — moath naji
– moath naji, Commented Aug 23, 2017 at 22:56
Hi, what check?

UncleDaveIsWatching
– UncleDaveIsWatching

2017-08-23 23:05:23 +00:00
Commented Aug 23, 2017 at 23:05 — UncleDaveIsWatching
– UncleDaveIsWatching, Commented Aug 23, 2017 at 23:05

marc_s · Accepted Answer · 2017-08-24 05:04:37Z

2

In the metadata class, you must not specify your "properties" as full properties - just the type and name is needed - try this:

public class peopleMetaData
{
    [Required(ErrorMessage = "Please enter a name")]
    [StringLength(50, MinimumLength = 2)]
    public string firstName;
}

See - no { get; set; } for the firstName "property" here

answered Aug 24, 2017 at 5:04

marc_s

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3 Comments

UncleDaveIsWatching Over a year ago

My solution now woks with {get;set;} specified. Is it better to leave it from the solution for some kind of code readability?

marc_s Over a year ago

@laz: so what did you do / change to make it work now??

UncleDaveIsWatching Over a year ago

i added the "jqueryval" to the layout page (as suggested by @OrElse) and i used the "Model.IsValid" in the controller (as suggested by @moath naj)

OrElse · Accepted Answer · 2017-08-23 23:38:48Z

1

For client side validation, make sure you have included @section Scripts { @Scripts.Render("~/bundles/jqueryval") } within your view

answered Aug 23, 2017 at 23:38

OrElse

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2 Comments

UncleDaveIsWatching Over a year ago

That was the problem. Thanks for the response.

OrElse Over a year ago

@laz no worries :)

LogicalDesk · Accepted Answer · 2017-11-23 13:51:03Z

1

Partial classes can only exist within one project.

http://msdn.microsoft.com/en-us/library/wa80x488(v=vs.100).aspx

More specifically,

All partial-type definitions meant to be parts of the same type must be defined in the same assembly and the same module (.exe or .dll file). Partial definitions cannot span multiple modules.

answered Nov 23, 2017 at 13:51

LogicalDesk

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Comments

moath naji · Accepted Answer · 2017-08-23 23:08:32Z

0

you have to check if the model is valid or not in the controller

if (ModelState.IsValid) {
  //do something 
}
else
{
return View();
}

answered Aug 23, 2017 at 23:08

moath naji

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2 Comments

UncleDaveIsWatching Over a year ago

Thanks for the catch. It work's now but I don't get the validation message to be displayed.

moath naji Over a year ago

you are welcome if you can mark answer as correct to avoid other answers

LeY · Accepted Answer · 2017-08-23 23:25:05Z

0

You people Class doesn't have a property of firstName. You need that in your people class first, then the MetadataTypeClass

[MetadataType(typeof(peopleMetaData))]
public partial class people
{
    public string firstName { get; set; }
}

answered Aug 23, 2017 at 23:25

LeY

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1 Comment

UncleDaveIsWatching Over a year ago

the "people " is auto generated. I have a SQL table with that name that I have imported in with LINQ to SQL layer.

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