一秒钟后更改边框的背景颜色 [英] Change the background color of border after one second

问题描述

我单击边框的按钮背景是蓝色，一秒钟后应该是红色.它是红色但不是蓝色.为什么?

I click the button background of border is blue,after one second it should be red.It is red but not blue.why?

<Window x:Class="WpfApplication1.Window1"

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

    Title="Window1" Height="300" Width="300">
    <Border Width="111" Name="op" Height="111">
        <Button Name="opbtn" Click="opbtn_Click" Width="50" Height="23">click</Button>
    </Border>
</Window>

private void opbtn_Click(object sender, RoutedEventArgs e)
{
    op.BorderBrush = System.Windows.Media.Brushes.Blue;
    DateTime obj1 = new DateTime();
    DateTime obj2 = DateTime.Now.AddMilliseconds(200);
    while (obj2 > obj1)
    {
        obj1 = DateTime.Now;
    }
    op.BorderBrush = System.Windows.Media.Brushes.Red;
}

推荐答案

AddMilliseconds应该使用1000作为参数一秒钟. 200毫秒仅是一秒的1/5，UI可能需要很长时间才能赶上您想要的内容，因此您实际上并没有*看到*更改.作为测试，我将AddMilliseconds参数设置为2000，只是让您有机会看到它.

AddMilliseconds should use 1000 as a parameter for one second. 200 milliseconds is just 1/5 of a second, and it probably takes that long for the UI to catch up witgh what you want, so you''re not actually *seeing* the change. As a test, I would make the AddMilliseconds parameter 2000, just to give you a chance to see it.

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