C# 如何在 WPF 中执行操作之前设置延迟
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How to put delay before doing an operation in WPF
提问by BharathNadadur
I tried to use the below code to make a 2 second delay before navigating to the next window. But the thread is invoking first and the textblock gets displayed for a microsecond and landed into the next page. I heard a dispatcher would do that.
我尝试使用以下代码在导航到下一个窗口之前延迟 2 秒。但是线程首先调用，文本块显示一微秒并进入下一页。我听说调度员会这样做。
Here is my snippet:
这是我的片段：
tbkLabel.Text = "two mins delay";
Thread.Sleep(2000);
Page2 _page2 = new Page2();
_page2.Show();
采纳答案by Phil
The call to Thread.Sleep is blocking the UI thread. You need to wait asynchronously.
对 Thread.Sleep 的调用阻塞了 UI 线程。您需要异步等待。
Method 1: use a DispatcherTimer
方法 1：使用 DispatcherTimer
tbkLabel.Text = "two seconds delay";
var timer = new DispatcherTimer { Interval = TimeSpan.FromSeconds(2) };
timer.Start();
timer.Tick += (sender, args) =>
{
timer.Stop();
var page = new Page2();
page.Show();
};
Method 2: use Task.Delay
方法二：使用Task.Delay
tbkLabel.Text = "two seconds delay";
Task.Delay(2000).ContinueWith(_ =>
{
var page = new Page2();
page.Show();
}
);
Method 3: The .NET 4.5 way, use async/await
方法三：.NET 4.5方式，使用async/await
// we need to add the async keyword to the method signature
public async void TheEnclosingMethod()
{
tbkLabel.Text = "two seconds delay";
await Task.Delay(2000);
var page = new Page2();
page.Show();
}
