Trying to get SelectList working in BlazorApp form that worked perfectly in RazorApp form

I have a Register form that I had working perfectly in a RazorPages App that I am unable to get working in a similar form in a Blazor Application. In both applications, I took the basic User Registration form and added a SelectList for Organisations with Id as the Value and Name as the text.

I put both applications in a common solution and got the data for the SelectList from a Persistence layer/project as follows:

In the Razor Pages app, I generated the SelectList as follows:

    public async Task OnGetAsync(string returnUrl = null)    {     ReturnUrl = returnUrl;     var mhas = await _organisationService.GetMhasList();     ViewData["SelectListMhas"] = new SelectList(mhas, "Id", "Name");    }

In the blazor app, data retrieval looked as follows:

public SelectList? SelectListMhas { get; set; }protected override async Task OnInitializedAsync(){    var mhas = await OrganisationService.GetMhasList();    SelectListMhas = new SelectList(mhas, nameof(OrganisationInListDto.Id), nameof(OrganisationInListDto.Name));}

Both worked perfectly generating the required SelectList

For the Razor Pages app, the required field was coded as follows:

<div class="form-floating mb-3 "><select asp-for="Input.OrganisationId" asp-items="ViewBag.SelectListMhas" class="form-select"></select><label asp-for="Input.OrganisationId"></label><span asp-validation-for="Input.OrganisationId" class="text-danger"></span></div>

This worked perfectly and a dropdown list organisations was produced when clicking on the field.

The equivalent code in the blazor app was as follows:

<div class="form-floating mb-3 "><label asp-for="Input.OrganisationId"></label><select asp-for="Input.OrganisationId" asp-items="SelectListMhas" class="form-select"></select><span asp-validation-for="Input.OrganisationId" class="text-danger"></span></div>

This did not work. An empty dropdown list was produced when clicking on the field.

Any help greatly appreciated.

I have also tried using asp-items="@SelectListMhas" but this also did not work.