为 RichTextBox 中的特定行着色答案

【问题标题】：Color specific lines in RichTextBox为 RichTextBox 中的特定行着色
【发布时间】：2016-06-02 12:16:10
【问题描述】：

我的应用程序中有一个 RichTextBox，它读取一个文本文件，一个确切的日志文件，如下所示： http://pastebin.com/3ETeYSUH 就这样继续下去。

我的问题是，如何将整条线涂成红色，上面写着“Sikertelen csatlakozás”？（是的，匈牙利语，意思是：“无法连接”）

我读取文件的代码：

string fileName = "servermanagerlog.txt";
            TextRange range;
            FileStream fStream;
            if (File.Exists(fileName))
            {
                range = new TextRange(richTextBox.Document.ContentStart, richTextBox.Document.ContentEnd);
                fStream = new FileStream(fileName, FileMode.OpenOrCreate);
                range.Load(fStream, DataFormats.Text);
                fStream.Close();
            }
            richTextBox.ScrollToEnd();

【问题讨论】：

标签： c# wpf richtextbox

【解决方案1】：

试试这段代码（我只是手动添加文本而不是从文件中添加）：

    void richTextBox_Loaded(object sender, RoutedEventArgs e)
    {
        TextRange range = new TextRange(richTextBox.Document.ContentStart, richTextBox.Document.ContentEnd);
        range.Text = "Here is one line with some text" + Environment.NewLine;
        range.Text += "Here is another line Sikertelen csatlakozás with some text" + Environment.NewLine;
        range.Text += "Here is another line with some text" + Environment.NewLine;
        range.Text += "Here is another line Sikertelen csatlakozás with some text" + Environment.NewLine;
        range.Text += "Here is one line with some text" + Environment.NewLine;
        range.Text += "Here is another line Sikertelen csatlakozás with some text" + Environment.NewLine;
        range.Text += "Here is another line with some text" + Environment.NewLine;
        range.Text += "Here is another line Sikertelen csatlakozás with some text" + Environment.NewLine;

        String strSearch = "Sikertelen csatlakozás";
        int start = range.Text.IndexOf(strSearch);

        TextPointer tp = null;

        if (start > -1)
        {
            tp = range.Start.GetPositionAtOffset(start);
        }

        while (tp != null)
        {
            TextPointer tpLine = tp.GetLineStartPosition(0);

            TextPointer tpLineEnd = tp.GetLineStartPosition(1);
            TextPointer lineEnd = (tpLineEnd !=null ? tpLineEnd : tp.DocumentEnd).GetInsertionPosition(LogicalDirection.Backward);

            TextRange redText = new TextRange(tpLine, lineEnd);
            redText.ApplyPropertyValue(TextElement.ForegroundProperty, Brushes.Red);
            tp = tpLineEnd;

            if (tp != null)
            {
                start = range.Text.IndexOf(strSearch, start + 1);

                if (start > -1)
                {
                    tp = range.Start.GetPositionAtOffset(start);
                }
            }
        }
    }

我使用以下 Stack Overflow 链接了解查找文本的详细信息：WPF Richtextbox Application.Find Text spanning Multiple runs，获取线路：Using GetLineStartPosition to get the end of a line in WPF RichTextBox，最后为文本着色：Change color and font for some part of text in WPF C#

【讨论】：