在 ASP.NET Core MVC Razor 视图中，与@model IEnumerable 相关的问题<namespace.model>对比@model<namespace.model></namespace.model></namespace.model>

Question

In an ASP.NET Core MVC Razor view, I have 2 forms. One input form is used to populate 2 dropdown lists as ajax modelpopup and saving values in database. Another form is used to display the related values as datatable in same view.

When I try to populate data.table by @foreach(var item in Model) loop by declaring @model IEnumerable<Namespace.Model> in view, it works fine for assigning value to datatable controls.

But other form having dropdownlist shows error. Not able to declare asp-for for select control.

<div class="form-group"> @{var Jsonlist = new electList((System.Collections.IEnumerable)ViewData["JsonPropVD"], "Value", "Key");}
    <select asp-items="Jsonlist" asp-for="ClientCatalog" class="form-control"></select>
</div> 


public void GetJsonProperties()
{
    PropertyInfo[] propertyInfosSM = typeof(SMJsonModel).GetProperties();

    if (propertyInfosSM != null)
    {
        Dictionary<string, object> Jsondictresults = new Dictionary<string, object>();

        foreach (PropertyInfo propertyInfoJson in propertyInfosSM)
        {
            Jsondictresults.Add(propertyInfoJson.Name, propertyInfoJson.Name);
        }

        ViewBag.VBJsonProp = Jsondictresults.Keys;
        ViewData["JsonPropVD"] = Jsondictresults;
    }            
}

When I change from @model IEnumerable<Namespace.Model> to @model<Namespace.Model> , I am able to access dropdownlist in the form but @foreach(var item in Model) shows an error. So I need to populate with viewbag.

<tbody>
@foreach (K360Master Mappeddata in ViewBag.K360MappedData)
{
    <tr>
        <td>@Mappeddata.Id</td>
        <td>@Mappeddata.ClientCatalog</td>
        <td>@Mappeddata.K360catalog</td>
        <td>
            <button id="btnDelete" asp-action="DeletePost" asp-route-Id="@Mappeddata.Id" class="btn btn-danger mr-3">Delete</button>
        </td>                         
    </tr>
}
</tbody>

It's not advisable to use viewbag and viewdata. Please guide me how to achieve this by using strongly typed view for the above requirement.

Answer 1

You can remove the asp-for tag helper in the select tag, and manually set its id and name

<select asp-items="Jsonlist" id="ClientCatalog" name="ClientCatalog" class="form-control"></select>