How to calculate a running total?
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How to calculate a running total?
In foreach
in a MVC view, is it possible to calculate a running total of the Amount
value?
@foreach (var item in Model)
{
<tr>
<td>@Html.DisplayFor(modelItem => item.ID)</td>
<td>@Html.DisplayFor(modelItem => item.Amount)</td>
<td> // here Item.Amount, should sum based on previous</td>
</tr>
}
Is it possible here in view or I need any method in controller?
Can you - Yes
@{ decimal runningTotal = 0M; } // assumes Total is typeof decimal
@foreach (var item in Model)
{
runningTotal += item.Amount
<tr>
<td>@Html.DisplayFor(modelItem => item.ID)</td>
<td>@Html.DisplayFor(modelItem => item.Amount)</td>
<td>@runningTotal</td>
</tr>
}
Should you - No
Create a view model to represent what you want to display in the view (i.e. include a public decimal RunningTotal { get; set; }
property in addition to properties ID
and Amount
, and do the calculation in the controller where it belongs, so that in the view its simply
<td>@Html.DisplayFor(modelItem => item.RunningTotal)</td>
Note this also gives you the flexibility to apply a [DisplayFormat]
attribute to format the value in the view.
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