如何访问 - 更新新窗口（C＃，WPF） [英] How to access - update new window (C#, WPF)

问题描述

我有一个窗口A，我在foreach循环中处理一个更大的XML文件。

在循环之前我打算创建一个新的进度窗口（B），在循环中我应该能够像处理XY包那样更新窗口B.



任何想法，链接，样本或更简单的方法吗？



感谢任何提示！



我尝试过的事情：



我试图创建一个新线程，也调用窗口B上的文本框，没有运气

I have window A where i process a bigger XML file within a foreach loop.
Before the loop I plan to create a new "progress" window (B), and within the loop I should be able to update window B like XY package was processed.

Any idea, link, sample or easier way to do this?

Thanks for any hint!

What I have tried:

I tried to create a new thread, also invoke the textbox on window B with no luck

推荐答案

最好的办法是另一个圆形。



将所有处理代码移到一个单独的线程中： BackgroundWorker Class（System.ComponentModel）| Microsoft Docs [ ^ ]是一个不错的选择，因为它提供了进度报告而没有任何交叉线程UI问题。



然后使用报告机制来更新进度表单（甚至只是主表单上的进度控件。



该链接包含一个简单示例。

The best way to do this is the other way round.

Move all the "Processing" code into a separate thread: BackgroundWorker Class (System.ComponentModel) | Microsoft Docs[^] is a good choice because it provides progress reporting without any cross threading UI problems.

Then use the reporting mechanism to update the progress form (or even just a progress control on your main form.

The link contains a simple example.

请看一下这个样本：



MainWindow.xaml

Please have a look at this sample:

MainWindow.xaml

<Window x:Class="WpfProgressTest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfProgressTest"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition></RowDefinition>
            <RowDefinition Height="Auto"></RowDefinition>
            <RowDefinition Height="Auto"></RowDefinition>
        </Grid.RowDefinitions>
        <Grid Grid.Row="1" Height="30">
            <ProgressBar Name="ProgressBar"
                         Foreground="Blue"></ProgressBar>
            <TextBlock Name="TextBlockProgress"
                       FontFamily="Arial"
                       FontSize="16"
                       FontWeight="Bold"
                       HorizontalAlignment="Center"
                       VerticalAlignment="Center"
                       Background="Blue" 
                       Foreground="White"></TextBlock>
        </Grid>
        <StackPanel Grid.Row="2">
            <Button Name="ButtonStart" Width="75" Height="25" Margin="5" Content="Start" Click="ButtonStart_OnClick"></Button>
        </StackPanel>
    </Grid>
</Window>

MainWindow.xaml.cs

MainWindow.xaml.cs

using System.Threading;
using System.Threading.Tasks;
using System.Windows;

namespace WpfProgressTest
{
    public partial class MainWindow
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void ButtonStart_OnClick(object sender, RoutedEventArgs e)
        {
            var itemsCount = 10;

            ProgressBar.Minimum = 0;
            ProgressBar.Maximum = itemsCount;

            var task = new Task(() =>
            {
                for (var i = 0; i < itemsCount; i++)
                {
                    // Just for simulation of some work
                    Thread.Sleep(500);

                    Application.Current.Dispatcher.Invoke(() =>
                    {
                        ProgressBar.Value++;
                        TextBlockProgress.Text =

[{ProgressBar.Value} / {ProgressBar.Maximum}];
}）;
}
}）;

task.Start（）;
}
}
}

"[{ProgressBar.Value}/{ProgressBar.Maximum}]"; }); } }); task.Start(); } } }

你必须在任务或线程中完成繁重的XML处理工作。

为了模拟工作量，我添加了500ms的Sleep。

每次迭代后，你必须使用 Application.Current更新进度条和文本

。 Dispatcher.Invoke 。

这是必要的，因为您无法从其他线程访问UI组件。

You must do the heavy work of XML processing in a task or thread.
For simulating the workload I added a Sleep of 500ms.
After each iteration you must update the progress bar and text
by using Application.Current.Dispatcher.Invoke.
This is necessary because you cannot access UI components from a different thread.

这篇关于如何访问 - 更新新窗口（C＃，WPF）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！