WPF大量添加文本块UI线程，但WinForms不会吗？

WPFRichTextBox是一个非常重的UI元素，因为它不仅允许以WPF文档的形式提供丰富的内容，而且还具有编辑功能。

在这种情况下，您真正​​需要的是FlowDocumentScrollViewer。

这是我的Log Viewer示例的小改编，它使用FlowDocumentScrollViewer代替了ItemsControl。优点是，此UI元素允许选择和复制文本，同时保留您需要的RTF功能：

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <FlowDocumentScrollViewer Document="{Binding}"/>
</Window>

背后的代码：

public partial class MainWindow : Window
    {
        private System.Random random;
        private string TestData = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum";
        private List<string> words;
        private int maxword;
        private int index;

        private FlowDocument doc;
        private Paragraph paragraph;

        public MainWindow()
        {
            InitializeComponent();

            DataContext = doc = new FlowDocument();

            doc.Blocks.Add(paragraph = new Paragraph());

            Task.Factory.StartNew(AddDataLoop);
        }

        private void AddDataLoop()
        {
            random = new Random();
            words = TestData.Split(' ').ToList();
            maxword = words.Count - 1;

            while (true)
            {
                Thread.Sleep(10);
                Dispatcher.BeginInvoke((Action) (AddRandomEntry));
            }
        }

        private void AddRandomEntry()
        {
            var run = new Run(string.Join(" ", Enumerable.Range(5, random.Next(10, 50))
                                                         .Select(x => words[random.Next(0, maxword)])));

            var isBold = random.Next(1, 10) > 5;

            if (isBold)
                paragraph.Inlines.Add(new Bold(run));
            else
                paragraph.Inlines.Add(run);

            paragraph.Inlines.Add(new LineBreak());
        }
    }

结果：

• Once again, this proves that there's absolutely nothing you can achieve in winforms that can't be achieved with WPF, whereas the opposite can't be said, obviously. This makes winforms a practically obsolete technology that is literally replaced by newer, more capable ones.

• Notice that I placed a 10 millisecond delay between each new entry. This is practically real time, and the UI does not show any slowing down or flickering or any quality degradation of any kind.

• As with my other example, notice that most of the code behind is literally boilerplate to generate random text, the only relevant lines of code are paragraph.Inlines.Add(...).

• WPF Rocks. - simply copy and paste my code in a File -> New Project -> WPF Application and see the results for yourself.

• Let me know if you need further help.