Unable to load Data in NavMenu-CodePudding

When I try to get values from Database for my NavMenu it seems that the values aren`t available fast enought.

NavMenu Html:

<h2>test</h2><h2>@titleList.Single(x => x.name == "test2").value</h2>

NavMenu code:

protected override async Task OnInitializedAsync()
        {
            titleList = await client.GetFromJsonAsync<List<NavMenuStringModel>>("api/navMenuStrings");
        }

Controller:

[HttpGet]
    public async Task<IActionResult> Get()
    {
        List<NavMenuStringModel> navMenuStringModels = new List<NavMenuStringModel>()
        {
            new NavMenuStringModel(){name = "test2", value="test2"}
        };
        return Ok(navMenuStringModels);
    }

->Unhandelt exeption in Browser. ->Console shows "No element is currently associated with component 8"

CodePudding user response：

Although you didn't show it, I'm assuming titlelist is initialized as null.

So you probably need something like this:

<h2>test</h2>
@if(titlelist != null)
{
    <h2>titleList.SingleOrDefault(x => x.name == "test2").value</h2>    
}

I also suggest SingleOrDefault in case there is no matching element.

Finally you may need to call StateHasChanged() after you populate titlelist.