Page de modification avec champ liste (select)

public async Task<ActionResult> Edit(int? id) { if (id == null) { return NotFound(); } var SearchOperation = await _context.Operations.FromSqlRaw("EXEC dbo.affiche_operations").ToListAsync(); var listOperations = SearchOperation.FirstOrDefault(x => x.numero_operation == id); if (listOperations == null) { return NotFound(); } var listeNatureOperation = await _context.NatureOperations.ToListAsync(); ViewBag.lib_nature= new SelectList(listeNatureOperation, "CodeNature", "LibNature", selectedValue: listOperations.lib_nature); var listEmetteur = await _context.Emetteurs.ToListAsync(); ViewBag.Emetteur = new SelectList(listEmetteur, "CodeEmetteur", "raison_sociale", selectedValue: listOperations.CodeEmetteur); return View(listOperations); }

<form asp-action="Edit"> <div asp-validation-summary="ModelOnly" class="text-danger"></div> <input type="hidden" asp-for="numero_operation" /> <div class="form-group"> <label asp-for="CodeEmetteur" class="control-label"></label> <select asp-for="CodeEmetteur" asp-items="@ViewBag.Emetteur" class="form-control"> <option value="">-- Selectionner émetteur --</option> </select> <span asp-validation-for="CodeEmetteur" class="text-danger"></span> </div> <div class="form-group"> <label asp-for="lib_nature" class="control-label"></label> <select asp-for="lib_nature" asp-items="@ViewBag.lib_nature" class="form-control"> <option value="">-- Selectionner le type --</option> </select> <span asp-validation-for="lib_nature" class="text-danger"></span> </div> </form>

Bonjour,
J'ai trouvé la solution à mon problème en modifiant le controller et la page cshtml

Controller

Code:

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public async Task<ActionResult> Edit(int? id)
{
 
    if (id == null)
    {
        return NotFound();
    }
 
    var operation =  _context.Operations.FirstOrDefault(x => x.numero_operation == id);
 
    if (operation == null)
    {
        return NotFound();
    }
 
    var Model = operation;
 
    var listeEmetteurs = await _context.Emetteurs.Where(n => n.CodeEmetteur == operation.CodeEmetteur).ToListAsync();
    ViewBag.codeEmetteur = new SelectList(listeEmetteurs, "CodeEmetteur", "RaisonSociale", operation.CodeEmetteur);
 
    var listeNatureOperation = await _context.NatureOperations.Where(n => n.Code_Nature == operation.CodeNature).ToListAsync();
 
    Model.ListEmetteur = await _context.Emetteurs.Select(e => new SelectListItem
    {
        Value = e.CodeEmetteur.ToString(),
        Text = e.RaisonSociale
    }).ToListAsync();
 
    Model.ListNatureOperation = await _context.NatureOperations.Select(n => new SelectListItem
    {
        Value = n.Code_Nature.ToString(),
        Text = n.Lib_Nature
    }).ToListAsync();
 
    return View(Model);
}

La page

Code:

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v class="col-md-4">
        <form asp-action="Edit" enctype="multipart/form-data">
            <div asp-validation-summary="ModelOnly" class="text-danger"></div>
            <input type="hidden" asp-for="numero_operation" />
            <div class="form-group">
                <label asp-for="CodeEmetteur" class="control-label"></label>
                <select asp-for="CodeEmetteur" asp-items="Model.ListEmetteur" class="form-control">
                    <option value="">-- Selectionner l émetteur --</option>
                </select>
                <span asp-validation-for="CodeEmetteur" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label asp-for="CodeNature" class="control-label"></label>
                <select asp-for="CodeNature" asp-items="Model.ListNatureOperation" class="form-control">
                    <option value="">-- Selectionner le type --</option>
                </select>
                <span asp-validation-for="CodeNature" class="text-danger"></span>
            </div>
</form>