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QuestionAwait - Async not so simple to use? Pin
Richard Andrew x6424-Jan-17 12:24
professionalRichard Andrew x6424-Jan-17 12:24 
I have a form Form1 on which is a listbox and a button.

Consider the following code, and read the problem I am having with it below:

private async void button1_Click(object sender, EventArgs e)
{
    listBox.Items.AddRange(new object[] {"Hello", "There", "Code", "Project."});
    await PerformLengthyTask();
}

private async Task<bool> PerformLengthyTask()
{
    Thread.Sleep(5000);
    return true;
}

What I THOUGHT would happen when I clicked the button:
The new items would appear instantly in the listbox because while the UI thread is waiting for the PerformLengthyTask function, it is free to pump messages and keep the UI responsive. Roll eyes | :rolleyes:

What ACTUALLY happens when I click the button:
The new items do not appear in the listbox until after PerformLengthyTask returns. Confused | :confused:
And also, the form itself is frozen.

What is it that I do not understand about async methods that is causing me this confusion?



The difficult we do right away...
...the impossible takes slightly longer.

AnswerRe: Await - Async not so simple to use? Pin
Nathan Minier24-Jan-17 14:22
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GeneralRe: Await - Async not so simple to use? Pin
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QuestionDelegates Pin
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QuestionPlz Send Me The Simpler Answer to connect with SSIS And SSRS Both In any Version fo the Excell Pin
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