将字符串添加到列表MVC

Question

Im using MVC4 Razor and I just want to ask how to create a List of string and use it in a field seperated by comma? Cause I tried something and it shows an error Cannon implicitly convert type void to object Ill show you my set of codes

declared this on my header:

 List<string> elements = new List<string>();

Then I want this List<string> elements to get populated inside a foreach loop

    <tbody>
            @for (var i = 0; i < Model.Cards.Count; ++i)
                 {
                    var counter = i + 1;
                    <tr>    
                        <td valign="middle"> 
                            <p class="small">@counter</p>
                        </td>
                        <td valign="middle">                         
                             <p class="small">@Model.Cards[i].Number.Substring(0,5)</p>
                        </td>
                        @elements.Add(Model.Cards[i].Number.Substring(0,5))
                   </tr>
                 }
    </tbody>

And use it in a Label

<div> Card Number <p> @String.Join(", ", elements.ToArray()) </p></div>

Answer 1

If you flow @Stephen Muecke , suggestion it's best. But if you flow your process the your code look like:

@{
    List<string> elements = new List<string>();
 }

     <tbody>
            @for (var i = 0; i < Model.Cards.Count; ++i)
                 {
                    var counter = i + 1;
                    var cardNumber=Model.Cards[i].Number.Substring(0,5);
                    elements.Add(cardNumber);
                    <tr>    
                        <td valign="middle"> 
                            <p class="small">@counter</p>
                        </td>
                        <td valign="middle">                         
                             <p class="small">@cardNumber</p>
                        </td>                    
                   </tr>

                 }
    </tbody>
@{
    var str=string.Join(", ", elements.ToArray());
}

<div> Card Number <p> @str </p></div>