CODEWITHSUNDEEP
wpfmultithreadinguser-interface
Tuan Do
Tuan Do

Reputation: 303

Please help me about UI Thread of WPF

I am writting a project on WPF. Before displaying main window, I must query some data from DB and then based on the data, I will draw some user control on main window by code behind. The processing take about 3 - 5 seconds. So when first launch mainwindows, It will display as white screen. After 3 - 5 seconds, the window will display fully.

I want to ask that, is there anyway to do display a waiting view and do the drawing user control in another thread. After finish, then load fully main window.

Please help me. Thanks in advance :).

Upvotes: 4

Views: 77

Answers (1)

Eldar Dordzhiev
Eldar Dordzhiev

Reputation: 5135

You need to offload the UI Thread. You can do it by using either TPL or BackgroundWorker. I recommend you to use TPL with async-await, as it's much easier and the code is more clear.

private QueryResult QueryDatabase()
{
    // Here's your db access code
    return result;
}

private Task<QueryResult> QueryDatabaseAsync()
{
    // This code will be queued to ThreadPool
    return Task.Run(QueryDatabase);
}

private async void LoadedHandler(...)
{
    IsProgressVisible = true;

    Items = await QueryDatabaseAsync();

    IsProgressVisible = false;
}

Upvotes: 2

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