Multi tool use

Correct way to use AutoMapper in ASP.Net MVC

I'm trying to start using ViewModels - but I'm having trouble with this POST not validating - the values in the model are shown in the Watch part below the code:

ModelStats.IsValid = false

My ItemViewModel is:

public class ItemViewModel
{
public int ItemId { get; set; }
[Display(Name = "Item")]
public string ItemName { get; set; }
[Display(Name = "Description")]
public string Description { get; set; }
[Display(Name = "Price")]
public double UnitPrice { get; set; }
[Range(0.00, 100, ErrorMessage = "VAT must be a % between 0 and 100")]
public decimal VAT { get; set; }
[Required]
public string UserName { get; set; }
}


I'm sure it will be something simple - but I've just been looking at it so long, I can't figure out what I'm doing wrong. Can anyone please advise?

Thanks, Mark

UserName

2 Answers
2

As far as Validation failure is concerned.

If you are not supplying UserName in the form, then remove [Required] from ItemViewModel

UserName

ItemViewModel

In order to Use AutoMapper

First, Create a map, such as

Mapper.CreateMap<Item, ItemViewModel>();


And then map

var itemModel = Mapper.Map<Item, ItemViewModel>(model);


Refer: How do I use AutoMapper? section in https://github.com/AutoMapper/AutoMapper/wiki/Getting-started

ModelState

ModelState

Make sure your ItemViewModel, Item classes have same fields or not. If same fields with same Datatypes AutoMapper works fine.

ItemViewModel

Item

Mapper.CreateMap< Item, ItemViewModel>();

Mapper.Map< Item, ItemViewModel>(ItemVM);


If Fields are not same in both the classes make sure that same with Custom Mapping.

Mapper.CreateMap<UserDM, UserVM>().ForMember(emp => emp.Fullname,
map => map.MapFrom(p => p.FirstName + " " + p.LastName));


In the above Custom Mapping Fullname is UserVM field that maps with FirstName, LastName fields from UserDM (here UserDM is Domain Model, UserVM is View Model).

Fullname

UserVM

FirstName

LastName

UserDM

UserDM

UserVM

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