Bring model value to Textarea

Question

I have the following page cshtml

@using SoftluxWebCore.ViewModels.Tabelas
@model SoftluxWebCore.ViewModels.Tabelas.MensagemViewModel
<!-- Link to CSS -->
<link href="~/css/Geral/create.css" rel="stylesheet" />


@using (Html.BeginForm())
{

    using (Html.DevExtreme().ValidationGroup())
    {
        @Html.AntiForgeryToken()
        <div class="divFormulario">

            <textarea cols=60 id="opiniao" rows="10" name="men_mensagem" maxlength="500" wrap="hard" placeholder=""></textarea>

        </div>
        <br />

        <button type="submit" class="btn btn-success btn-sucesso"><i class="far fa-check-circle"></i> Gravar</button>
        <button class="btn btn-danger btn-cancelar" onclick="parent.fecharJanela('CadastroAmbiente')"><i class="far fa-times-circle"></i> Cancelar</button>

    }
}

@section Scripts {
    @{await Html.RenderPartialAsync("_ValidationScriptsPartial"); }
}

This is the page update, she has methods get and post in controller, when I do the post, it sends me the right way, sends to men_mensagem which I defined in the attribute name, but when I do the get, the textarea comes empty, how can I do to bring the data?

My method of controller:

    [HttpGet]
    [Route("Mensagem/Update/{Men_codigo}")]
    public async Task<IActionResult> Update(int? Men_codigo)
    {
        int? Emp_codigo = Services.Token.strEmp_codigo;
        var UrlApi = $"api/Mensagem/find/{Men_codigo},{Emp_codigo}";
        Uri BaseAdress = Services.Token.BaseAdress;
        string strToken = Services.Token.strToken;

        MensagemModel Ambiente;
        MensagemViewModel AmbienteVM = new MensagemViewModel();
        using (HttpClient httpClient = new HttpClient())
        {
            httpClient.BaseAddress = BaseAdress;
            httpClient.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", strToken);
            httpClient.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("Application/Json"));
            using (HttpResponseMessage response = await httpClient.GetAsync(UrlApi))
            {
                response.EnsureSuccessStatusCode();
                string resul = await response.Content.ReadAsStringAsync();
                Ambiente = JsonConvert.DeserializeObject<MensagemModel>(resul);
                AmbienteVM.Men_codigo = Ambiente.Men_codigo;
                AmbienteVM.men_mensagem = Ambiente.men_mensagem;
            }
        }
        return View(AmbienteVM);
    }

Answer 1

Try to replace your:

<textarea cols=60 id="opiniao" rows="10" name="men_mensagem" maxlength="500" wrap="hard" placeholder=""></textarea>

For:

@Html.TextAreaFor(model => model.men_mensagem, new { htmlAttributes = new { @style = "text-align: center;", @class = "form-control col-md-12" } })