Conditional rendering in asp.net core razor, without evaluating expression

Question

I have an asp.net core MVC application, and I'm using an if statement for conditional rendering.

In the following code snippet:

if (@item.Date.HasValue)
{
    <div>
        <text>@Common.DateConverter.GetHijriDateString(item.Date.Value)</text>
    </div>
}

Why is it throwing a (InvalidOperationException: Nullable object must have a value.) exception, if the value is null, even though I have placed a check for null value in the enclosing if statement?

David Liang · Accepted Answer · 2020-06-29 16:39:57Z

1

Your Razor expression is wrong. Your if didn't start with an @ so it's just a HTML not the razor. So even though @item.Date.HasValue would run fine, it will fail on the GetHijriDateString parameter item.Date.Value when the date doesn't have a value.

To fix it:

@if (item.Date.Hasvalue)
{
    ...
}

answered Jun 29, 2020 at 16:39

David Liang

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