在 Windows 商店应用程序中调用服务时，ProgressBar 按钮不显示 [英] ProgressBar button doesn't show while service call in windows store app

问题描述

我想在进行服务调用时显示 ProgressBar.产品.xml

I want to show ProgressBar when service call made. Product.xml

<ProgressBar Name="loading1" Visibility="Collapsed" IsIndeterminate="True" HorizontalAlignment="Left" Height="50" Width="535" VerticalAlignment="Center" Background="White" Grid.Row="1" Margin="0,311,0,310"/>

Product.xml.cs

Product.xml.cs

loading.Visibility = Visibility.Visible;  //loading start
getAllProductDetails();   //contain service call and bind data in list
loading.Visibility = Visibility.Collapsed;  //loading finish

加载应该在getAllProductDetails()"调用之前开始，并且应该在getAllProductDetails()"完成后完成.

Loading should start before "getAllProductDetails()" call and it should finish once "getAllProductDetails()" finish.

如果我还使用了 await Task.Run(() => getAllProductDetails()); 它会继续执行 "await Task.Run(() =>; getAllProductDetails());".它必须等到getAllProductDetails()"调用完成它的工作.

if I have also used await Task.Run(() => getAllProductDetails()); it keep execution of next line of "await Task.Run(() => getAllProductDetails());". It must wait until "getAllProductDetails()" call complete it's job.

有人可以告诉我我在这里缺少什么吗?

Can anybody suggest me what I am missing here?

推荐答案

更改您的 getAllProductDetails() 以返回 Task 而不是 void

Change your getAllProductDetails() to return Task instead of void

private async Task getAllProductDetails()
{
    // Body
}

然后这样调用

loading.Visibility = Visibility.Visible;  //loading start
await getAllProductDetails();
loading.Visibility = Visibility.Collapsed;  //loading finish

如果任何异步函数返回void，您就不能等待执行完成.

If any async function returns void you can't wait for completion of execution.

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