How to remove ID required validation from primary key filed in MVC5

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I am working on an existing project in MVC5 in that there is a drop-down called Department in my create model I have below required filed.

C#

 [Required]
public int DepartmentID { get; set; }

Now the person who is using this does not want required validation I tried to make it nullable by adding(?) after int. but it is not letting me change, I am getting an error on my controller Cannot implicitly convert type 'int?' to 'int'. An explicit conversion exists (are you missing a cast?) I think because of primary key but not sure can anyone help me, please

C#

 // [Required]
public int? DepartmentID { get; set; }

and also I tried this line by adding in my controller
ModelState.Remove("DepartmentID");

C#

[ValidateAntiForgeryToken]
       public ActionResult Create(CreateModel model)
       {
           ModelState.Remove("DepartmentID");
           if (ModelState.IsValid)
           {

               document.DepartmentID = model.DepartmentID; // Cannot implicitly convert type 'int?' to 'int'. An explicit conversion exists (are you missing a cast?)

What I have tried:

I tried to change int to int? and removing Department Id from (ModelState.IsValid)

Posted 29-Nov-17 5:45am

Member 10754595

Updated 29-Nov-17 6:47am

David_Wimbley

v3

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David_Wimbley · Accepted Answer · 2017-11-29T06:45:00

I don't think this has anything to do with primary key, unless you are saying DepartmentId is a primary key.

My suggestion would be to add to your DropDownListFor data a default option of "Select" and set the value of that Select to 0. Since your field is an integer, and assuming its required as such in the database than its going to be 0 anyway. If 0 is a possible value, then set the value to say...-1.

So your code would look like

C#

var selectData = new List<SelectListItem>();
selectData.Add(new SelectListItem { Text ="Select", Value = "-1"});
selectData.Add(new SelectListItem { Text ="Actual Selection", Value = "Actual Value"});

@Html.DropDownListFor(m=>m.DepartmentID, selectData, new{@class=""})

This way, if no selection is made, you know that -1 means they didnt choose any values.

The other option is to pass it in as -1 and when the validation runs, use the null coalescing operator to default the value to 0 if what comes through from the model is null.

Ex: var safeDeptId = (DepartmentID ?? 0); That way if no option was selected, your defaulting to 0 and shouldn't get the error indicating you are missing a cast.

Just some ideas on how to solve your problem.