The model item passed into the viewdatadictionary is of type 'system.collections.generic.list

Question

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Hi, I want to achieve getting data from database

public class ModelSearch
   {
       [Key]
       public int  Id { get; set; }
       public string RegID { get; set; } = null!;
       public string Gender { get; set; } = null!;
       public string FullName { get; set; } = null!;
       public decimal Average { get; set; }
       public decimal Total { get; set; }
       public bool IsActive { get; set; }

   }
public class ModelSearch1
   {
       [Key]
       public int Id { get; set; }

       [Display(Name = "Name")]
       [Required(ErrorMessage = "Name is Required")]
       public string Name { get; set; } = null!;


       public List<ModelSearch>? ModelSearch { get; set; }
   }

What I have tried:

I have this querry on my controller
<pre> var ak = (from c in cdc.Studentdata
                           
                           select new ModelSearch {

                               RegID = c.RegID,
                               
                               FullName = c.Name,
                                                        }).OrderByDescending(c => c.FullName).ToList();

/*This Querry get the list of all user information. I want my View to display ModelSearch1*/

var ve = new List<ModelSearch1>();
                  
                    ve.Add(new ModelSearch1 {ModelSearch = ak /*ak is the querry from modelsearch*/});

                    ViewBag.search = ve;
my View Page has this
@model Testing.Models.ModelSearch1
my Table display has this 
@for (int item = 0; item <  Model.ModelSearch.Count(); item++) {
<tr>
<td>
                                    
                                    <input type="hidden" asp-for="modelSearch[item].Id" value="@Model.ModelSearch[item].Id"/>
                                      
                                </td>
</tr>
}

InvalidOperationException: The model item passed into the ViewDataDictionary is of type 'System.Collections.Generic.List`1[Testing.Models.ModelSearch1]', but this ViewDataDictionary instance requires a model item of type 'Testing.Models.ModelSearch1'.

Where Am I getting it wrong.. Thanks for your precious time

Posted 11-Aug-22 1:04am

Difameg Network Nigeria

Updated 11-Aug-22 3:47am

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Richard Deeming · Accepted Answer · 2022-08-11T03:47:00

Solution 1

The error is pretty clear: your view declares that its model must be a single instance of the ModelSearch1 class, but your action is trying to pass in a list of ModelSearch1 objects.

Either change the action to pass in the expected model, or change the view to match the model passed by the action.

Posted 11-Aug-22 3:47am

Richard Deeming

Comments

Difameg Network Nigeria 11-Aug-22 10:24am

Thanks for the response, It didnt work I hard to change       @model <Testing.Models.ModelSearch1
to 
      @model Ienumerable<Testing.Models.ModelSearch>
but the issue i am having is ... The data will have to be posted back to the controller and i am not able to get  asp-for ='item.Id.  or is there any way i can embed  
<input type="hidden" asp-for="modelSearch[item].Id" value="@Model.ModelSearch[item].Id"/> into the views table?

Thanks for your precious time

Richard Deeming 11-Aug-22 10:26am

As I said, you need to make up your mind; is your view going to display a single item or a list of items?

At the moment, it's like you've made space on your shelf to store a single apple, and you're now trying to shove an entire orchard into that space. It's not going to end well.

Difameg Network Nigeria 11-Aug-22 10:52am

The view will display multiple items

Richard Deeming 11-Aug-22 12:02pm

So you need:

@model List<Testing.Models.ModelSearch1>

and:

@for (int index = 0; index < Model.Count; index++)
{
    <input type="hidden" asp-for="Model[index].Id" />
    ...
}

Difameg Network Nigeria 12-Aug-22 3:41am

Thank you very much for your time... It worked for me... is their a way to add css inside a code block like this
@{ string name = "My Name is John Doe and Position 1^st"; } it display the line break.. Thanks

Richard Deeming 12-Aug-22 4:46am

If you want to output a string containing HTML markup, you need to use the Html.Raw method:

@{ string name = "Position 1<sup>st</sup>"; }
@Html.Raw(name)

Difameg Network Nigeria 12-Aug-22 6:26am

Thanks, It worked.. I trully Apprciate.