Using a condition in ASP MVC3 Html.DisplayFor control

Question

Is there a way to use a condition in the ASP MVC3 @Html.DisplayFor() control? Below is the syntax I attempted. While it seems the partner.TradingPartners is able to use .Where<>, according to Visual Studio I am doing it wrong!

Here is the syntax I use

        @foreach (var item in Model.Agent.SymNumberToAgentId)
        {
            var gogo = ViewBag.Periscope + item.AgentId.Trim();
            <tr>
                <td>
                    @Html.DisplayFor(modelItem => item.DisplayAgentId)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.CompanyCode)
                </td>
                <td>
                    @foreach (var partner in Model.AgentIdDetails)
                    {
                        @Html.DisplayFor(modelItem => partner.TradingPartners.Where(item => item.AgentId == partner.AgentId))
                    }
                </td>
                <td>
                    @Html.ActionLink("Remove", "Delete", "SymetraNumberToAgentId", new { id = item.SymetraNumber, aid=item.AgentId}, null)
                </td>
                <td>
                    <a href=@gogo target="_blank">View in Periscope</a>
                </td>
            </tr>
        }

and here is the error message

CS1928: 'System.Collections.Generic.IList<string>' does not contain a definition for 'Where' and the best extension method overload 'System.Linq.Enumerable.Where<TSource>(System.Collections.Generic.IEnumerable<TSource>, System.Func<TSource,bool>)' has some invalid arguments

Much cleaner to filter this list in the controller

Forty-Two
– Forty-Two

2013-02-11 21:52:37 +00:00
Commented Feb 11, 2013 at 21:52 — Forty-Two
– Forty-Two, Commented Feb 11, 2013 at 21:52

Akhil · Accepted Answer · 2013-02-11 22:03:18Z

2

Edit: After the question was updated (code inside foreach):

      @foreach (var partner in Model.AgentIdDetails)
                    {
                        @Html.DisplayFor(modelItem => partner.TradingPartners.Where(x => x.AgentId == item.AgentId).XYZProperty)
                    }

You need to use Proper syntax in the where clause. Also, you should specify the Property for the filtered Trading Partner.

<td>
    @foreach (var partner in Model.AgentIdDetails)
    {
        @Html.DisplayFor(modelItem => partner.TradingPartners.Where(item => item.AgentId == partner.AgentId).XYZProperty)
    }
</td>

edited Feb 11, 2013 at 22:03

answered Feb 11, 2013 at 21:55

Akhil

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5 Comments

Rick Liddle Over a year ago

Deleted my answer, you beat me to it. But I still think it's valid to consider what @Forty-Two said... this is probably better done in the controller.

Akhil Over a year ago

True. The best practice is to do it in the controller. +1 to @Forty-Two

NealR Over a year ago

Sorry, I should have been clearer in my description of the code. This is taking place inside a foreach loop

NealR Over a year ago

Ugh.. the edited answer resulted in the following error message:

'string' does not contain a definition for 'AgentId' and no extension method 'AgentId' accepting a first argument of type 'string' could be found (are you missing a using directive or an assembly reference?)

NealR Over a year ago

I believe the issue is there is no AgentId property in the TradingPartners list.

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