突出显示 WPF TextBlock 中的文本

Question

我正在尝试突出显示或设置 WPF TextBlock 中某些选定文本的背景。 假设我有 2 个文本文件加载到内存中，完成一个差异，然后想要在 WPF 应用程序中显示。想象一下循环遍历每一行，然后将文本附加到文本块并根据已删除、插入或相等的文本更改颜色。

for (int i = 0; i < theDiffs.Count; i++)
        {
            switch (theDiffs[i].operation)
            {
                case Operation.DELETE:
                    // set color to red on Source control version TextBlock
                    break;

                case Operation.INSERT:
                    WorkspaceVersion.AppendText(theDiffs[i].text);
                    // set the background color (or highlight) of appended text to green
                    break;

                case Operation.EQUAL:
                    WorkspaceVersion.AppendText(theDiffs[i].text);
                    // Set the background color (highlight) of appended text to yellow
                    break;

                default:
                    throw new ArgumentOutOfRangeException();
            }
        }

Answer 1

您需要将Run 内联元素附加到TextBlock Inlines。例如（假设“WorkspaceVersion”是一个 TextBlock）：

case Operation.INSERT:
    // set the background color (or highlight) of appended text to green
    string text = theDiffs[i].text;
    Brush background = Brushes.Green;
    var run = new Run { Text = text, Background = background };
    WorkspaceVersion.Inlines.Add(run);
break;