C#•2y ago

How to pass variable from one View to another View in link?

Ok, so I have this code in my view:

@foreach (var item in Model)
{
    @if(Model.Any(utilizadorGrupo=>utilizadorGrupo.UtilizadorId == userID))
    {
        @if (userID == item.UtilizadorId)
        {

            <a id="nomeGrupo" href="@Url.Action("verPublicacaoGrupo")?nomeGrupo=@item.Grupo.Nome_grupo"><strong>@item.Grupo.Nome_grupo</strong></a>
        }
    }
}

@foreach (var item in Model)
{
    @if(Model.Any(utilizadorGrupo=>utilizadorGrupo.UtilizadorId == userID))
    {
        @if (userID == item.UtilizadorId)
        {

            <a id="nomeGrupo" href="@Url.Action("verPublicacaoGrupo")?nomeGrupo=@item.Grupo.Nome_grupo"><strong>@item.Grupo.Nome_grupo</strong></a>
        }
    }
}

@foreach (var item in Model)
{
    @if(Model.Any(utilizadorGrupo=>utilizadorGrupo.UtilizadorId == userID))
    {
        @if (userID == item.UtilizadorId)
        {

            <a id="nomeGrupo" href="@Url.Action("verPublicacaoGrupo")?nomeGrupo=@item.Grupo.Nome_grupo"><strong>@item.Grupo.Nome_grupo</strong></a>
        }
    }
}

@foreach (var item in Model)
{
    @if(Model.Any(utilizadorGrupo=>utilizadorGrupo.UtilizadorId == userID))
    {
        @if (userID == item.UtilizadorId)
        {

            <a id="nomeGrupo" href="@Url.Action("verPublicacaoGrupo")?nomeGrupo=@item.Grupo.Nome_grupo"><strong>@item.Grupo.Nome_grupo</strong></a>
        }
    }
}

as you can see, in this view I am including a link to another view, I loop through a collection of objects and would like to pass the value of one of the fields of that object (Nome_grupo) to the view being linked to. I am doing it in the Razor syntax way because it seemed simpler, but I am open to any other way as this one has proved a bit wonky.

Angius•1/31/24, 6:54 PM

asp-route-{name}asp-route-{name}

Angius•1/31/24, 6:54 PM

In general, use the anchor tag helper

Angius•1/31/24, 6:55 PM

<a asp-controller="GrupoController" asp-action="GetGrupos" asp-route-id="@Model.Grupo.Id">Show Grupo</a>

<a asp-controller="GrupoController" asp-action="GetGrupos" asp-route-id="@Model.Grupo.Id">Show Grupo</a>

Angius•1/31/24, 6:56 PM

https://learn.microsoft.com/en-us/aspnet/core/mvc/views/tag-helpers/built-in/anchor-tag-helper?view=aspnetcore-8.0

AAngius ```html <a asp-controller="GrupoController" asp-action="GetGrupos" asp-route-id=...

GipperOP•1/31/24, 6:59 PM

Oh, I didnt realize asp-route-asp-route- was a wildcard prefix, I thought asp-route-idasp-route-id was the only valid attribute lol

GipperOP•1/31/24, 6:59 PM

thanks again

AAngius ```html <a asp-controller="GrupoController" asp-action="GetGrupos" asp-route-id=...

GipperOP•1/31/24, 7:13 PM

Hey, but how do I "retrieve" that variable in the destination view being linked?

Pobiega•1/31/24, 7:14 PM

you'd take a parameter at the controller action with that name

Pobiega•1/31/24, 7:14 PM

id

id

in that case

Angius•1/31/24, 7:14 PM

Depends. Could be a part of the route, could be a query param

Angius•1/31/24, 7:14 PM

[HttpGet("api/grupos/{id}")]
public async Task<IActionResult> GetGrupoById(int id)

[HttpGet("api/grupos/{id}")]
public async Task<IActionResult> GetGrupoById(int id)

Angius•1/31/24, 7:14 PM

Could be a query param

Angius•1/31/24, 7:15 PM

[HttpGet("api/grupos")]
public async Task<IActionResult> GetGrupoById([FromQuery] int id)

[HttpGet("api/grupos")]
public async Task<IActionResult> GetGrupoById([FromQuery] int id)

GipperOP•1/31/24, 7:29 PM

ok, it's as a part of the route and it seems to be working as intended, I'm passing the id in a ViewData entry to the target view itself which I'm not sure is the perfect way to do it, but I think it seems correct enough

GipperOP•1/31/24, 7:32 PM

speaking of which, @ZZZZZZZZZZZZZZZZZZZZZZZZZ @Pobiega if I have more than one thing to pass as model to the view, generally speaking is it preferable to pass one as model and the rest inside viewdata or to create a viewmodel obj with all the data aggregated and pass that viewmodel obj??

Pobiega•1/31/24, 7:32 PM

viewmodel

Pobiega•1/31/24, 7:32 PM

10000000*10^123478154781%

Angius•1/31/24, 7:33 PM

Everything in the model

Angius•1/31/24, 7:33 PM

ViewDataViewData is basically a Dictionary<string, object>Dictionary<string, object>

Angius•1/31/24, 7:33 PM

I only ever use it if I have to pass, dunno, the current page title from a page to the layout

Angius•1/31/24, 7:33 PM

And I think in the middleware that times the page generation

Angius•1/31/24, 7:34 PM

But I wouldn't use it to pass anything but simple primitives, and certainly not when there is a better way

AAngius But I wouldn't use it to pass anything but simple primitives, and certainly not ...

GipperOP•2/2/24, 9:44 PM

I sometimes have two corresponding primitives and pass them both in a Dictionary through ViewData

GipperOP•2/2/24, 9:45 PM

stay mad

GipperOP•2/2/24, 9:45 PM

Jk, thanks for the advice guys

How to pass variable from one View to another View in link?

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