C# WPF - 如何简单地从另一个类/线程更新 UI
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C# WPF - How to simply update UI from another class/thread
提问by Jakub Lok?a
I couldn't find a simplesolution to this problem. That's why I'm asking.
我找不到解决这个问题的简单方法。这就是为什么我要问。
I have a WPF windowlike this:
我有一个像这样的 WPF窗口：
<Window x:Class="WPF_Test.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Width="640" Height="480">
<Button Name="xaml_button" Content="A Text."/>
</Window>
And a MainWindow class:
和一个 MainWindow类：
using System.Windows;
using System.Threading;
namespace WPF_Test
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
xaml_button.Content = "Text changed on start.";
}
}
private void xaml_button_Click()
{
Threading.t1.Start();
UIControl.ChangeButtonName("Updated from another CLASS.");
}
}
The button's Contentproperty successfullychanged itself. But what I want to do, is to change the property in anotherclass orthread. What I tried is this:
按钮的Content属性成功地改变了自己。但是我想做的是更改另一个类或线程中的属性。我试过的是这样的：
class UIControl
{
public static void ChangeButtonName(string text)
{
var window = new MainWindow();
window.xaml_button.Content = text;
}
}
It obviously doesn't work, because the public MainWindow()changes the Contentproperty back to the original one, and brings some issues along with it.
它显然不起作用，因为将属性public MainWindow()更改Content回原始属性，并随之带来一些问题。
Also I want to use this while multithreading. My simple threading class looks like this:
我也想在多线程时使用它。我的简单线程类如下所示：
class Threading
{
public static Thread t1 = new Thread(t1_data);
static void t1_data()
{
Thread.Sleep(2000);
UIControl.ChangeButtonName("Updated from another THREAD.");
}
}
回答by Jakub Lok?a
To do this, I'd recommend declaring a staticvariable that holds a UI control of your likings, in this case, a Button. Also add using System.Windows.Controls;at the beginning. So your code should look like this:
为此，我建议声明一个静态变量，该变量包含您喜欢的 UI 控件，在本例中为Button. 也在using System.Windows.Controls;开头添加。所以你的代码应该是这样的：
using System.Threading;
using System.Windows;
using System.Windows.Controls;
namespace WPF_Test
{
public partial class MainWindow : Window
{
public static Button xamlStaticButton;
public MainWindow()
{
InitializeComponent();
xamlStaticButton = xaml_button;
xamlStaticButton.Content = "Text changed on start";
}
private void xaml_button_Click(object sender, RoutedEventArgs e)
{
Threading.t1.Start();
UIControl.ChangeButtonName("Updated from another CLASS.");
}
}
}
So pretty much what I did was to make a placeholderfor the button, then assigningit on start.
所以我所做的几乎就是为按钮制作一个占位符，然后在开始时分配它。
class UIControl : MainWindow
{
public static void ChangeButtonName(string text)
{
App.Current.Dispatcher.Invoke(delegate {
xamlStaticButton.Content = text;
});
}
}
Now I inheritedthe MainWindowclass to the UIControlclass for the sake of convenience. Also to make this work with multithreading, I added the App.Current.Dispatcher.Invoke(delegate { /*your UI code you want to execute*/});. This will make sureyour UI will update even if you are on another thread.
现在，我继承的MainWindow类的UIControl类为方便起见。同样为了使这项工作与多线程一起工作，我添加了App.Current.Dispatcher.Invoke(delegate { /*your UI code you want to execute*/});. 这将确保即使您在另一个线程上，您的 UI 也会更新。
