在 WPF C# 中更改部分文本的颜色和字体

Question

有没有办法更改我想放在 TextBox 或 RichTextBox 上的部分文本的颜色和字体。我正在使用 C# WPF。

例如

 richTextBox.AppendText("Text1 " + word + " Text2 ");

可变字例如为 Text1 和 Text2 中的其他颜色和字体。是否有可能以及如何做到这一点？

Answer 1

如果您只是想做一些快速着色，最简单的解决方案可能是将 RTB 内容的结尾用作 Range 并对其应用格式。例如：

TextRange rangeOfText1 = new TextRange(richTextBox.Document.ContentEnd, richTextBox.Document.ContentEnd);
rangeOfText1.Text = "Text1 ";
rangeOfText1.ApplyPropertyValue(TextElement.ForegroundProperty, Brushes.Blue);
rangeOfText1.ApplyPropertyValue(TextElement.FontWeightProperty, FontWeights.Bold);

TextRange rangeOfWord = new TextRange(richTextBox.Document.ContentEnd, richTextBox.Document.ContentEnd);
rangeOfWord.Text = "word ";
rangeOfWord.ApplyPropertyValue(TextElement.ForegroundProperty, Brushes.Red);
rangeOfWord.ApplyPropertyValue(TextElement.FontWeightProperty, FontWeights.Regular);

TextRange rangeOfText2 = new TextRange(richTextBox.Document.ContentEnd, richTextBox.Document.ContentEnd);
rangeOfText2.Text = "Text2 ";
rangeOfText2.ApplyPropertyValue(TextElement.ForegroundProperty, Brushes.Blue);
rangeOfText2.ApplyPropertyValue(TextElement.FontWeightProperty, FontWeights.Bold);

如果您正在寻找更高级的解决方案，我建议您阅读this Microsoft Doc about Flow Document，因为它为您提供了极大的文本格式灵活性。

Answer 2

你可以试试这个。

public TestWindow()
{
    InitializeComponent();

    this.paragraph = new Paragraph();
    rich1.Document = new FlowDocument(paragraph);

    var from = "user1";
    var text = "chat message goes here";
    paragraph.Inlines.Add(new Bold(new Run(from + ": "))
    {
        Foreground = Brushes.Red
    });
    paragraph.Inlines.Add(text);
    paragraph.Inlines.Add(new LineBreak());
    this.DataContext = this;
}
private Paragraph paragraph;

使用 RichTextBox 的 Document 属性。

Answer 3

您需要使用 RichTextBox 的 Document 属性并为其添加 Run。

文档属性：http://msdn.microsoft.com/en-us/library/system.windows.controls.richtextbox.document.aspx
运行：http://msdn.microsoft.com/en-us/library/system.windows.documents.run.aspx

Answer 4

我已经创建了自己的class 来操纵Texts 的TextBlock、TextBox...

/// <summary>
/// Class for text manipulation operations
/// </summary>
public class TextManipulation
{
    /// <summary>
    /// Is manipulating a specific string inside of a TextPointer Range (TextBlock, TextBox...)
    /// </summary>
    /// <param name="startPointer">Starting point where to look</param>
    /// <param name="endPointer">Endpoint where to look</param>
    /// <param name="keyword">This is the string you want to manipulate</param>
    /// <param name="fontStyle">The new FontStyle</param>
    /// <param name="fontWeight">The new FontWeight</param>
    /// <param name="foreground">The new foreground</param>
    /// <param name="background">The new background</param>
    /// <param name="fontSize">The new FontSize</param>
    public static void FromTextPointer(TextPointer startPointer, TextPointer endPointer, string keyword, FontStyle fontStyle, FontWeight fontWeight, Brush foreground, Brush background, double fontSize)
    {
        FromTextPointer(startPointer, endPointer, keyword, fontStyle, fontWeight, foreground, background, fontSize, null);
    }

    /// <summary>
    /// Is manipulating a specific string inside of a TextPointer Range (TextBlock, TextBox...)
    /// </summary>
    /// <param name="startPointer">Starting point where to look</param>
    /// <param name="endPointer">Endpoint where to look</param>
    /// <param name="keyword">This is the string you want to manipulate</param>
    /// <param name="fontStyle">The new FontStyle</param>
    /// <param name="fontWeight">The new FontWeight</param>
    /// <param name="foreground">The new foreground</param>
    /// <param name="background">The new background</param>
    /// <param name="fontSize">The new FontSize</param>
    /// <param name="newString">The New String (if you want to replace, can be null)</param>
    public static void FromTextPointer(TextPointer startPointer, TextPointer endPointer, string keyword, FontStyle fontStyle, FontWeight fontWeight, Brush foreground, Brush background, double fontSize, string newString)
    {
        if(startPointer == null)throw new ArgumentNullException(nameof(startPointer));
        if(endPointer == null)throw new ArgumentNullException(nameof(endPointer));
        if(string.IsNullOrEmpty(keyword))throw new ArgumentNullException(keyword);

        TextRange text = new TextRange(startPointer, endPointer);
        TextPointer current = text.Start.GetInsertionPosition(LogicalDirection.Forward);
        while (current != null)
        {
            string textInRun = current.GetTextInRun(LogicalDirection.Forward);
            if (!string.IsNullOrWhiteSpace(textInRun))
            {
                int index = textInRun.IndexOf(keyword);
                if (index != -1)
                {
                    TextPointer selectionStart = current.GetPositionAtOffset(index,LogicalDirection.Forward);
                    TextPointer selectionEnd = selectionStart.GetPositionAtOffset(keyword.Length,LogicalDirection.Forward);
                    TextRange selection = new TextRange(selectionStart, selectionEnd);

                    if(!string.IsNullOrEmpty(newString))
                        selection.Text = newString;

                    selection.ApplyPropertyValue(TextElement.FontSizeProperty, fontSize);
                    selection.ApplyPropertyValue(TextElement.FontStyleProperty, fontStyle);
                    selection.ApplyPropertyValue(TextElement.FontWeightProperty, fontWeight);
                    selection.ApplyPropertyValue(TextElement.ForegroundProperty, foreground);
                    selection.ApplyPropertyValue(TextElement.BackgroundProperty, background);
                }
            }
            current = current.GetNextContextPosition(LogicalDirection.Forward);
        }
    }
}

用法

TextManipulation.FromTextPointer(_TextBlock.ContentStart, _TextBlock.ContentEnd, "IWantToBeManipulated", NewFontStyle, NewFontWeight, NewForeground, NewBackground, NewFontSize);
TextManipulation.FromTextPointer(_TextBlock.ContentStart, _TextBlock.ContentEnd, "IWantToBeManipulated", NewFontStyle, NewFontWeight, NewForeground, NewBackground, NewFontSize, "NewStringIfYouWant");

Answer 5

如果您想先添加一条线，然后再为它的一部分着色，对@Gimno 的答案稍作改动可能会有所帮助：

TextRange rangeOfLine = new TextRange(rtbTest.Document.ContentEnd, rtbTest.Document.ContentEnd);
rangeOfLine.Text = "This is a long string";
rangeOfLine.ApplyPropertyValue(TextElement.ForegroundProperty, Brushes.Black);

TextRange rangeToColor = new TextRange(rtbTest.Document.ContentEnd.GetPositionAtOffset(-5), rtbTest.Document.ContentEnd.GetPositionAtOffset(-2));
rangeToColor.ApplyPropertyValue(TextElement.ForegroundProperty, Brushes.Red);

这使您可以首先向富文本框添加一行文本，该文本框是黑色的。添加后，根据内容的结尾从 -5 到 -2 的选择变为红色。

我添加到 RTB 的字符串被附加到多个函数中，因此如果必须为相应函数中的每个 sn-p 显示颜色，那将非常不方便。