How to dynamically set model type on ASP.NET Razor page?

Question

I have the following database context class:

public partial class MainDB_Context : DbContext
{
    public MainDB_Context()
    {
    }

    public MainDB_Context(DbContextOptions<MainDB_Context> options)
        : base(options)
    {
    }

    public virtual DbSet<Chosen> Chosens { get; set; }

    public virtual DbSet<BtnMsg> BtnMsgs { get; set; }

    public virtual DbSet<GameRoster> GameRosters { get; set; }
    ...
}

and this generic page model:

public class Admin_IndexModel<T> : PageModel where T : class
{
    readonly MainDB_Context dbContext;

    readonly List<string> DbSetNames;

    readonly DbSet<T> DbSet;
    readonly List<PropertyInfo> DbSetPropInfo;
    readonly List<string> DbSetPKeys;

    public List<T> AsyncDbSetItems;
    ...
    
}

I want to create a single Razor page that will show tables from the database, for example for these URLs:

/Admin/Chosen
/Admin/BtnMsg
/Admin/GameRoster

I want @model type to be respectively:

Admin_IndexModel<Chosen>
Admin_IndexModel<BtnMsg>
Admin_IndexModel<GameRoster>

this is my current Razor page:

@page "{DbSetName?}"

@using System.Reflection;

@using asp_net_sql.Models
@using asp_net_sql.Pages
@model Admin_IndexModel<Chosen>

@{
    var DbSetNames = ViewData["DbSetNames"] as List<string>;
    var DbSetPropInfo = ViewData["DbSetPropInfo"] as List<PropertyInfo>;
    ...
}

<menu id="adminMenu">
    @foreach (var menuItem in DbSetNames)
    {
        <div class="menu">@menuItem</div>
    }
</menu>

<form method="post">
    <table class="table">
        <thead>
            <tr>
                @foreach (var pInf in DbSetPropInfo)
                {
                    <th>@pInf.Name</th>
                }
                <th>&nbsp;</th>
            </tr>
        </thead>
        <tbody>
            @{
                foreach (var item in Model.AsyncDbSetItems)
                {
                    row++;
                    var btnId = $"btn_{row}";
                    <tr>
                        @foreach (var pInf in DbSetPropInfo)
                    {
                        var inpId = $"inp_{pInf.Name}_{row}";
                        <td>
                            <input id="@inpId" type="text" value="@pInf.GetValue(item)" />
                        </td>
                    }
                        <td>
                            <button id="@btnId"
                                    type="submit"
                                    asp-page-handler="Update">
                                Change (Post)
                            </button>
                        </td>
                    </tr>
                }
            }
        </tbody>
    </table>
</form>

how do I create expression for @model dynamically using DbSetName?

I don't have Views or Controllers.

Ruikai Feng · Accepted Answer · 2024-01-02 08:50:35Z

@model expects a certain type,@model Admin_IndexModel<T> is not supported,here's an issue related in asp.net mvc

For Asp.net Core Razor Pages,if you want to avoid avoid code duplication,you could create different partial views(Razor View not Razor Page )

A minimal example:

public class MyPageModel : PageModel
{


    [BindProperty(SupportsGet =true)]
    public string? Entity { get; set; }

    public List<BtnMsgs> btnMsgs { get; set; } = default!;

    public List<BtnMsgs> Chosen { get; set; } = default!;

    public List<BtnMsgs> GameRosters { get; set; } = default!;

    public void OnGet()
    {
       //read target entities from db

    }
}

Page:

@page "/Admin/{Entity}"
@model MyPageModel
@{

}

@if (some condition)
{
    <partial name="@Model.Entity" model="the entities you read from db"></partial>
}
// other conditions
....

And you could try with expression tree to reduce the codes in your partial view,I once tried a sample in this issue

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