correct format for Input string

Question

I have a helper method as follows.

@helper DisplayTrendIndicator(double lastYear, double twoYearsAgo)
{
if (lastYear > twoYearsAgo)
{
  <img id="green" src="@VirtualPathUtility.ToAbsolute("~/images/up.png")" />
}
else
{
  <img id="red" src="@VirtualPathUtility.ToAbsolute("~/images/down.png")" />
}
}

When I try to invoke the method in my program, I get an "Input string was not in a correct format". This is how I call the above helper

@Helpers.DisplayTrendIndicator(double.parse(lastYear.Content), double.parse(twoYearsAgo.Content))

Note: lastYear and twoYears ago are variables returned from an API call. I'm working on an ASP.NET MVC Project C#. How do I prevent this error from popping up.

Couldn't this be in your model to avoid confusing use of @ in razor? You could have it in your model and call it like @Model.DisplayTrendIndicator — Alfie Goodacre
– Alfie Goodacre, Commented Dec 13, 2016 at 12:56
The problem is with one of the double.Parse calls and the string that you are passing is not in the format of a double. — juharr
– juharr, Commented Dec 13, 2016 at 13:00
What are the values of: lastYear.Content and twoYearsAgo.Content? — madoxdev
– madoxdev, Commented Dec 13, 2016 at 13:13

Sunita · Accepted Answer · 2016-12-13 13:21:30Z

1

what are the values of lastYear and twoYears ago are variables returned from an API call.those are string??

try with Convert.ToDouble()

answered Dec 13, 2016 at 13:21

Sunita

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