ASP.NET MVC Exception : Templates can be used only with field access, property access, single-dimension array index, or single-parameter custom indexer expressions

{InvalidOperationException: Templates can be used only with field access, property access, single-dimension array index, or single-parameter custom indexer expressions}

I recently encountered above exception, when I tried to bind Data Model to View to show count of Order and here is Code:

HTML View:

<div class="form-group">

            @Html.LabelFor(m => m.PostedOrders)

                <div class="col-md-3">

                    @Html.DisplayFor(m => m. PostedOrders.Count())

                </div>

</div>

If you see exception, it tell, you can only bind @Html.DisplayFor with Field, Property of Model and it does not support function or expression.

To fix this problem, you need to add one additional property or field in Model Class [OrderDataModel] that holds the total count of posted orders and you can bind this field/property with view to display total count of posted order

C# :

public class OrderDataModel

    {

        public List<Order> PostedOrder { get; set; }

        public int Total => PostedOrder.Count;

    }

HTML View:

<div class="form-group">

            @Html.LabelFor(m => m.Total)

                <div class="col-md-3">

                    @Html.DisplayFor(m => m.Total)

                </div>

</div>

Thanks for visiting, please leave your comments if it helps