Wrong sequence of events in Blazor

Question

I have a Blazor server-side application. In the code-behind in .razor.cs of a component I have

    protected override async Task OnInitializedAsync()
    {
        ...

        _role = await Authorization.GetCurrentUserRoleAsync();
        QuoteModel = await QuotesDb.GetQuoteByIdAsync(_role, QuoteId);

In the .razor:

@if((DateTime.Now - QuoteModel.Date).TotalDays > 60)
{
    ... do something
}

When the application is run,

_role = await Authorization.GetCurrentUserRoleAsync();

in the code-behind is executed, and then in razor

@if((DateTime.Now - QuoteModel.Date).TotalDays > 60)

is executed, before QuoteModel is instantiated in code-behind, which of course causes a null reference exception.

How can I make sure QuoteModel is instantiated before it is used?

topsail · Accepted Answer · 2022-06-13 16:24:19Z

1

You can handle that with a null check:

@if(QuoteModel != null && DateTime.Now - QuoteModel.Date).TotalDays > 60)

answered Jun 13, 2022 at 16:24

topsail

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