how i know blazor OnInitializedAsync exec in once or twice-CodePudding

I want get data from db once on OnInitializedAsync. I try to use tableLoading to judue,but it's not work.

    protected override async Task OnInitializedAsync()
    {
        if (tableLoading)
        {
            return;
        }
       tableLoading = true;
        users = await userService.GetSome(1, userType);
        _total = await userService.GetCount(userType);
        tableLoading = false;
        Console.WriteLine("OnInitializedAsync");
    }

CodePudding user response：

How i know blazor OnInitializedAsync exec in once or twice?

It usually loads twice.

1. Once when the component is initially rendered statically as part of the page.
2. A second time when the browser renders the component.

However, If you want to load it once, in that case, you could go to _Host.cshtml and change render-mode="ServerPrerendered" to render-mode="Server", and it would be called only once as a result it would then load your data from the database once only.

Note: For more information you could refer to the official documents here

CodePudding user response：

I know it's usually loads twice, i want to know when the function is run, how to konw it's run on once or twice. This is my solution.

static bool first = true;
    protected override async Task OnInitializedAsync()
    {
        if (first)
        {
            first = false;
           Console.WriteLine("first time");
            return;
        }
Console.WriteLine("second time");
    }